Performance Specification For: Mechanical and Public Health Services Installation at: Union Road Clapham London SW1
On behalf of: Durkan Limited Durkan House 214 – 224 High Street Waltham Cross Hertfordshire EN8 7DR
Date Reference
July 2013 K130121
St John's House, 1A Knoll Rise, Orpington, Kent BR6 0JX T 01689 888222 F 01689 888299 E
[email protected] calfordseaden LLP is a Limited Liability Partnership Registered in England and Wales number OC315838 Registered Office: Devonshire House, 60 Goswell Road, London EC1M 7AD where a list of members is kept Regulated by RICS
ORPINGTON ▪ LONDON ▪ WINCHESTER ▪ BIRMINGHAM
www.calfordseaden.co.uk
Union Road – K130121
Mechanical Specification
SECTION 1 STANDARD PRELIMINARY CLAUSES INDEX 1 DEFINITIONS.................................................................................................................. 4 1.01 GENERALLY................................................................................................................ 5 1.02 STANDARDS & REGULATIONS ..................................................................................... 5 1.03 RELATED DOCUMENTS................................................................................................ 5 1.04 EXAMINATION OF DRAWINGS & SITE .......................................................................... 6 1.05 EXTENT OF WORK ...................................................................................................... 6 1.06 TENDERING REQUIREMENTS ....................................................................................... 7 1.07 QUANTIFIED SCHEDULE OF RATES .............................................................................. 7 1.08 VALUE ADDED TAX ..................................................................................................... 8 1.09 METHOD STATEMENTS ............................................................................................... 8 1.10 METHOD OF WORKING ............................................................................................... 8 1.11 WORKMANSHIP .......................................................................................................... 9 1.12 ASSIGNMENT OR SUB-LETTING ................................................................................. 10 1.13 VARIATONS ............................................................................................................. 10 1.14 PROVISIONAL SUMS ................................................................................................. 11 1.15 STORAGE ................................................................................................................. 11 1.16 REGULATIONS.......................................................................................................... 11 1.17 MATERIALS AND LABOUR .......................................................................................... 12 1.18 GAS SAFETY REGULATIONS....................................................................................... 12 1.19 HEALTH & SAFETY .................................................................................................... 13 1.20 CONTROL OF POLLUTION & MATERIALS & LABOUR .................................................... 13 1.21 SUPPRESSION OF EQUIPMENT .................................................................................. 14 1.22 NOISE & VIBRATION................................................................................................. 14 1.23 WATER, GAS & ELECTRICAL SERVICES ....................................................................... 14 1.24 BUILDERSWORK ....................................................................................................... 14 1.25 PROTECT THE FOLLOWING ....................................................................................... 15 1.26 UTILISATION OF BUILDING SERVICES ....................................................................... 15 1.27 ELECTRICAL WELDING .............................................................................................. 16 1.28 OPERATION OF PLANT .............................................................................................. 16 1.29 REDUNDANT MATERIALS .......................................................................................... 16 1.30 DAMAGE DUE TO OVERHEATING ............................................................................... 17 1.31 DAMAGE DUE TO FROST ........................................................................................... 17 1.32 COMMISSIONING ..................................................................................................... 17 1.33 CRANAGE................................................................................................................. 17 1.34 SETTING OUT AND FINISHES .................................................................................... 17 1.35 WORKING/INSTALLATION DRAWINGS........................................................................ 18 1.36 DRAWING FORMAT ................................................................................................... 19 1.37 RECORD DRAWINGS ................................................................................................. 19 1.38 OPERATING & MAINTENANCE MANUALS .................................................................... 20 1.39 GUARANTEES ........................................................................................................... 21 1.40 SPECIFIED EQUIPMENT............................................................................................. 21 1.41 INSPECTION PRIOR TO COVER .................................................................................. 22 1.42 SUPERVISION .......................................................................................................... 22 1.43 DEVIATION FROM DESIGN ........................................................................................ 22
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Mechanical Specification
Revision Notes Rev 00 01 02
Date July 2013 January 2014 Februrary 2014
For Tender For Construction Minor revisions
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Mechanical Specification
DEFINITIONS
The term “contractor” shall mean a sub-contractor employed by the main contractor under a domestic sub-contract arrangement within the principal contract between the employer and main contractor. Main Contractor Durkan Limited Durkan House 214 – 224 High Street Waltham Cross Hertfordshire EN8 7DR
Architect Steven Davy Peter Smith Architects Farnshaw House Farnshaw Street London N1 6HX
Services Engineer Calfordseaden St Johns House 1A Knoll Rise Orpington Kent BR6 0JX
Structural Engineer RSK LDE Ltd 18 Frogmore Road Hemel Hempstead Hertfordshire HP3 9RT
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Mechanical Specification
GENERALLY
The contractor shall be deemed to have allowed in his tender for the cost of complying with all the requirements of these preliminaries, which shall apply, to the whole of the works. The contractor shall fully comply with the specification and Employers Requirements. The contractor shall be required to prepare a detailed breakdown of his pricing of the preliminary items before the employer place an order. 1.02
STANDARDS & REGULATIONS
The entire Works shall comply in all respects with all relevant statutory instruments and regulations including the following: 1. Health and Safety Act 2. IEE 17th Edition Wiring Regulations BS 7671 3. British Standards 4. Electricity at Work Act 5. The Clean Air Act 6. The Gas Safety Regulations 7. Approved Building Regulations Documents 8. The Factories Act 9. Statutory Authorities Requirements 10. CIBSE Guide B 11. The IOP Plumbing Services Design Guide The tenderer shall ensure their price is based upon the latest edition of the regulations 1.03
RELATED DOCUMENTS
The contractor shall also comply with the project brief, architect’s and engineer’s general arrangement drawings and sustainable report. Any discrepancies between the specification, drawings and ER, shall be reported to the engineer for clarification. The Contractor shall fully acquaint himself with all the conditions of contract, and make all due allowance, prior to the submission of tender for the electrical works. The tenderer shall also visit site to fully familiarise himself with the existing building and proposed site.
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EXAMINATION OF DRAWINGS & SITE
The tenderer shall fully familiarise themselves with the architectural and structural drawings, to ensure that they are fully aware of the existing and new development, including construction method and program. The Contractor is responsible for all measurements and the compilation of quantities required and visiting the site as necessary. Site visits are particularly important since it is essential that the Contractor shall be fully aware of the conditions under which the work will be carried out. No extra costs will be allowed on account of insufficient knowledge, inaccurate measurements or errors. The Tender Drawings indicate diagrammatically the approximate routes of services and location of equipment and plant, but the exact positions will be determined by the Contractor to suit the actual space available within the building. The Contractor shall ascertain all architectural features, structural features, positions of other services and all other relevant information that may be required to establish satisfactory positioning and installation of the Works. The Contractor shall include for all costs associated with liasing with other trades, preparing working drawings, co-ordinating with all other trades, services or elements together with adequate site supervision to ensure that the Works are arranged to make optimal use of the space available. Working drawings shall be produced for approval prior to any work commencing. Approval of any drawings issued shall not exempt the Contractors responsibility for accuracy and correctness or the responsibility to comply with the Specification. 1.05
EXTENT OF WORK
The Works shall consist of the whole of the labour and unless otherwise indicated, all of the materials necessary to form a complete installation, including tests, adjustments and commissioning to give an effective working installation to the satisfaction of the Engineer. The words 'Complete Installation' shall mean: a) Complete in providing the specified performance and environmental conditions. b) Complete in providing all ancillary and sundry items required for the installation to operate efficiently and to ensure maintenance can be carried out in a practical manner. c) Complete in being totally safe under all possible conditions, i.e. during installation, operation and maintenance. d) Complete in complying with all relevant regulations, recommendations, British Standards, Codes of Practice and to recognised standards of workmanship. e) Complete in providing all necessary attendances, management, welfare facilities, storage, accommodation etc. to ensure that the contractor as the Principle Contractor effects the completion of the entire project/contract.
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TENDERING REQUIREMENTS
Tenderers shall make an assessment of all installation requirements to ensure that all costs are included for adjustments which could be necessary to the building fabric, building structure, external groundwork’s etc. in order for the Works to fully meet the Specification, ER’s and room data sheets Tenderers shall review all drawings, Specifications and information available at the time of Tendering to ensure the total Tender price includes for all adjustments to the building, fixtures, other services or trades to ensure that this price is based on totally integrating the Works within the building. Exact adjustments or adaptations to the building shall be established during the Contractors preparation of co-ordinated working drawings and full details shall be produced prior to the ordering of steelwork, structural items, roof trusses and all building materials in sufficient time to meet all requirements of the programme. This information must be included on Builderswork Drawings described elsewhere. No extra costs can be claimed for any adjustments needed to the building (or other items) in order for the specified Services and associated works to be provided. Allowance shall be made in the Tender price for services routes or positions being varied due to the following: a) Co-ordination with all other items. b) Comments from the Engineer during the course of drawing approvals for Working or Builders work Drawings. c) Off setting services to route services around building structure. d) Practical maintenance, subsequent removal or dismantling. e) Final setting-out and positions of ceilings, wall tiles and other finishes. f) Final positions of sanitaryware and sanitary services. The contractor shall make allowance for all necessary support bracketry and fixings. No extra costs can be claimed for any lack of detailed information in the Specification. There shall be no qualifications to the Tender or any exclusions regarding Tendering the Works. 1.07
QUANTIFIED SCHEDULE OF RATES
A comprehensive quantified schedule of rates for all materials, equipment and labour shall be submitted. Schedules of rates shall show all quantities, unit lengths etc and shall add up to the tender sum. The contractor shall be required to provide suppliers or sub-contractors quotations if requested by the engineer to substantiate any costs or prices.
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VALUE ADDED TAX
The tender shall be VAT exclusive. The contractor shall include for all administration costs incurred in connection with Value Added Tax. 1.09
METHOD STATEMENTS
Method Statements shall be provided for activities that involve safety precautions, specialised installation techniques, which are critical to the programme or require careful planning with other trades. The contractor shall provide all necessary method statements, submitted to the planning supervisor and engineer as appropriate. 1.10
METHOD OF WORKING
The Works shall be carried out in normal working hours except as specifically stated otherwise. The Engineer must be given 14 days notice of the date on which work will commence on site in order that a site meeting may be held before any fixing takes place to agree exact locations of services, equipment and plant. Full co-operation shall be given to the Engineer in planning the installation before the work is commenced. Particular care shall be taken to ensure there is close liaison with all other trades in installing servicing to prevent obstruction of electrical services positions, cable routes, switch positions, mechanical services pipework, access positions and plumbing etc. Services in ducts shall be readily accessible for maintenance. Any abortive works will be carried out at no cost to the main contractor or client. The routes of services and the approximate positions of the equipment and apparatus are to be agreed before commencement. The Contractor shall attend any meetings as are necessary to identify and confirm the requirements for working and installation as required. The meetings will be called by and under the direction of the Engineer or his representative and the object of the meeting will be: a) To establish the inter-relationship of services in such confined spaces such as ceiling voids, service ducts and plant rooms. b) Allow adequate space for maintenance and access purposes. c) Assist in the proper provision of builders work drawings. Where large items of plant and equipment, ductwork or long lengths of tube are to be installed, sufficient notice shall be given to ensure that access has been properly provided before construction work limits access.
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Particular care shall be taken to obtain uniform and tidy arrangements of wall and ceiling mounted equipment. The precise positions of a piece of equipment shall be determined as follows:a) Single items of equipment which are visually remote from other electrical or mechanical equipment shall be erected at the mounting heights stated in the Specification or on the drawings. b) Two or more items of equipment whether electrical or mechanical or both which are to be erected on the same wall or ceiling or which will be otherwise visually close to each other, shall be arranged in a neat and symmetrical group. Symmetry of arrangements shall be obtained by horizontal and vertical alignments through the centre lines and not edges of the equipment and for this purpose any mounting heights stated in the Specification or on Drawings may be varied slightly. It is important to note that full co-operation is necessary with all other trades concerned. The proposed arrangements showing the outlines of all of the electrical and mechanical equipment in each group shall be marked on the wall and that approval of the Structural Engineer or his representative shall be obtained before any holes or chases are cut out. The works shall be carried out as expediently as possible and sufficient labour shall be maintained on site to ensure that all services are installed in their correct sequence or sections as may be required to suit building progress. The works may not necessarily be continuous but no claims for breaks in continuity will be considered. Similarly no extra cost for any overtime work will be allowed except as previously agreed in writing by the Engineer. Where the Engineer authorises but does not issue instructions to work overtime, NO additional cost due to overtime working will be permitted. Claims in respect of overtime, which has been instructed by the Engineer, supported by signed time sheets, must be sent to the Engineer in the week following the week for which the claim is made. Facilities must be provided to the Engineer or his representative for checking same. FAILURE TO MAKE A CLAIM IN ACCORDANCE WITH THE FOREGOING PROCEDURE WILL FORFEIT THE RIGHT TO ANY CLAIM. 1.11
WORKMANSHIP
The description of workmanship in the Specification shall apply to the whole of the Works regardless of the section headings. The Works shall be carried out by fully skilled operatives with the assistance of trainees and apprentices; no more than one trainee or apprentice to each operative will be permitted. Special attention shall be made to the setting out of the works to ensure that they are fixed correctly in relation to the building and to any special features; fittings or other services attached to it and shall take all reasonable precautions to ensure that a neat appearance is achieved. If at any time during the progress of the Works any error shall appear to arise in the positions, levels or dimensions of the work, then these shall be amended at no expense to the Employer. The Works shall be carried out in strict accordance with recommendations of the manufacturers of the fittings, plant and equipment. All workmanship considered by the Engineer to be unsound and not in accordance with the Specification, shall be immediately removed and properly replaced at no 9
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expense to the Employer. 1.12
ASSIGNMENT OR SUB-LETTING
No portion of the work shall be assigned or sub-let without the written consent of the Engineer or his representative. The Contractor shall advise the Engineer prior to acceptance of Tender, the proportion of directly employed labour and sub-contract labour to be utilised on the works. Where specialist contractors are required for the specified works, they shall in all respects to these preliminary clauses and the specification in general. They shall be employed by the Contractor on a ‘domestic’ basis and the Contractor shall ensure that the specialist woks are fully incorporated in the main programme. 1.13
VARIATONS
No variations from the Drawings or Specifications shall be carried out unless authorised by the Engineer or his representative. The Engineer may issue written instructions regarding the alterations or modifications or the design or quality of works as shown on the Drawings and as described in the Specification forwarded with the invitation to tender for the works and may, by instruction, order the omission addition or substitution of any of the work, materials or goods to be used in the works. The cost, if any, of such variations shall be measured and valued as necessary in accordance with the following rules:a) The price, if any, in the Tender shall determine the valuation of extra work of a similar character executed under similar conditions as works priced therein. b) The prices, if any, in the Tender shall be used as the basis for determining the value of extra work, which is not of a similar character executed under similar conditions, so far as is reasonable, failing which a fair valuation shall be made. c) The Prices, if any, in the Tender shall determine the valuation of items omitted, provided that if omissions substantially very the conditions under which any remaining items or work are carried out, the prices for such remaining items shall be valued under rule b). d) The prices referred to a) and b) shall be shown in the quantified Schedule of Rates which shall be provided within 7 days of being so requested by the Engineer or his representative. e) Where extra works cannot be properly measured and valued in accordance with a), b), c) and d) above, daywork prices shall be allowed at the rates agreed prior to commencement of the contract. The daywork rates shall be applied in accordance with the ‘Definition of prime cost of daywork carried out under a heating, ventilation, air conditioning, piping, electrical and domestic engineering contract’ published by the Royal Institute of Chartered Surveyors, The Heating and Ventilating Contractors Association and Electrical Contractors Association. All variations and the costs thereof shall preferably be agreed prior to commencement of the works or failing this within two weeks of the works commencing. Where dayworks are acceptable, daywork sheets (in duplicate) in respect of the variations shall be submitted (for Approval) to the Engineer or his representative not later than the end of the week following that in which the work was carried out. After checking, one signed copy will be returned for pricing in accordance with the foregoing. FAILURE TO COMPLY WITH THE FOREGOING WILL FORFEIT THE RIGHT TO ANY CLAIM FOR EXTRA COSTS IN RESPECT OF THE VARIATIONS. 10
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PROVISIONAL SUMS
The Contractor shall include costs for all provisional sums as indicated. These sums may be expended in part or in whole at the sole discretion of the Engineer and deducted in whole or in part if not required. No guarantee is given that these sums will be expended in whole or in part. 1.15
STORAGE
The Contractor shall include all costs as appropriate and be responsible for all materials required for the Works. The Contractor shall include costs as necessary for providing temporary wiring and equipment. The Contractor shall include all costs for carrying out and providing all necessary equipment for the site transport, off-loading and hoisting to the required levels of materials and equipment supplied. Plant and materials shall not be deposited on roadways, footpaths, corridors or rooms unless prior permission has been obtained in writing from the Employer. The Employer must be advised of the movement of heavy loads. Every precaution is to be taken by the Contractor to safeguard the Works, materials and plant against damage and theft during the Works, which shall include all reasonable precautions and steps to prevent unauthorised persons going about the site. Any deterioration to plant or services caused by inadequate protection, lack of handling care of exposure to the elements shall be rectified to the complete satisfaction of the Engineer. The Works shall be totally devoid of rust, paint damage, deformations or any other damage. 1.16
REGULATIONS
The completes design and installation shall comply to the latest regulations of the following: a) b) c) d) e) f) g)
The I.E.E. Regulations of the Electrical Equipment of Building (Certificate to be provided). Gas Safe Regulations Regulations under the Factories Act. Regulations under the Electricity Acts. Regulations under the 1975 Building Acts. Any specialist Regulations issued by, or requirements of the Local statutory authorities. British Standards and Codes of Practice current at the time of tender.
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MATERIALS AND LABOUR
It shall be deemed that all matters regarding the supply of and conditions effecting labour, the facilities for obtaining the materials or articles referred to in the specification have been investigated by the contractor and that he is satisfied generally that information on all matters and contingencies which can in anyway influence the tender, have been obtained. Immediately following receipt of the order for the works, a list of manufacturers and catalogue numbers of items of equipment to be supplied shall be submitted to the engineer together with delivery dates. Where required, samples of materials shall be provided without charge to the engineer for approval before use. All materials shall be ordered to ensure that deliveries suit the programme and general progress of works. Where deliveries of the materials are extended and are likely to cause delay, the engineer shall be notified immediately so that alternative manufacturers and/or materials may be considered. Where a prior quotation from a manufacturer or supplier is referred to in the specification it is the responsibility of the contractor to confirm with the manufacturer/supplier that the quotation is still valid and that the requirements of the specification with regards to technical content in every detail, quoted price and contractual requirements. Any discrepancy should be immediately referred to the engineer (and confirmed in writing) for consideration and decision prior to the contractor completing and submitting his price to the employer. Letters of intent issued to suppliers for the purpose of reserving materials are not official orders and must be confirmed as soon as an order for the works has been issued. Reference to all letters of intent is given in the specification and copies of quotations to which they refer will be made available. Any deterioration to plant or services caused by inadequate protection, lack of handling care of exposure to the elements shall be rectified to the complete satisfaction of the engineer. The works shall be totally devoid of rust, paint damage, deformations or any other damage. 1.18
GAS SAFETY REGULATIONS
The whole of the gas installation must strictly comply with these regulations and special attention is drawn to parts IV and V of the same It is required that a line diagram be provided for the installation, the layout and wording, together with the location, shall be agreed with the engineer prior to the production and issue of this drawing.
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Mechanical Specification
HEALTH & SAFETY
All Works and operations on site are to strictly comply with the requirements and rules relating to safety, health and welfare. The Contractor shall comply with CDM regulations and should refer to the contract documents and pre-tender health & safety plan for further clarification. Permit to Work procedures shall be exercised where this would provide additional safeguards in achieving the highest levels of safety for all personnel during the progress of the Works. Care shall be taken to ensure that equipment; material or property does not create a safety hazard or obstruction. All unfinished work shall be left in a safe condition. Allowance shall be made for supplying and fixing temporary supports to provide adequate protection from unauthorised interference. All trench and duct covers etc shall be replaced when not under continuous safety supervision or adequate guards shall be erected to prevent accidents. The Employer will undertake no responsibility for the protection of the works. The use of industrial safety helmets to BS 5240 in all areas of the site is essential for all workers, site staff, and visitors. The engineer is empowered to exclude from the Contract any persons in breach of safety and welfare requirements. 1.20
CONTROL OF POLLUTION & MATERIALS & LABOUR
The attention of the contractor is drawn to the Control of Pollution Act 1974 with reference to the control of noise in relation to any demolition or construction work and the need particularly, where such works are adjacent to occupied property, where a high sensitivity to noise may be anticipated. The contractor shall allow for any costs or expenses arising from ascertaining from the appropriate Local Authority what requirements or restrictions, if any, shall apply to the works in this respect. All work and operations on site shall take into account the best practical means, as defined in Section 72 of the Control of Pollution Act 1974 as may be necessary to comply with BS 5228, the Code of Practice for Noise Control in Construction and Demolition Sites. All vehicles, plant and mechanical equipment used on the site shall be fitted with effective silencers and/or mufflers and shall be screened where appropriate. All power driven plant and silencing equipment shall be regularly and effectively maintained. Noisy equipment and the loading and unloading of lorries shall be sited away from noise sensitive areas wherever possible. All works and ancillary operations, which are audible at the site boundary, shall be carried out only between the hours of 08:00hrs and 17:00hrs on Monday to Saturdays and at no time on Sundays and Bank or Public Holidays.
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SUPPRESSION OF EQUIPMENT
Provide and install all necessary suppression equipment to prevent interference to radio, television and telephone by the electrical plant and equipment included in this contract. The equipment and methods to be used in determining the level of interference shall be as specified in BS 727 and the level of interference shall in all areas be those specified in BS 800: Part 1. Reference shall be made to CP1006 for guidance on the provision and installation of the equipment to meet the above standards. 1.22
NOISE & VIBRATION
Include for all necessary allowances in connection with the provision and fixing of any materials required for the elimination of noise or vibration. 1.23
WATER, GAS & ELECTRICAL SERVICES
Incoming water and gas shall be provided to suit the requirements of the proposed works. The installer shall liaise with the statutory authorities to ensure an adequate supply of gas water and electricity to serve the development. The Contractor shall include for all costs charged by the statutory and supply authorities for incoming electricity and drainage including all associated design costs, infrastructure charges etc. The Contractor shall include for all surveys, investigations and design fees associated with the incoming services. A meter reading shall be taken and recorded at the commencement and completion of all testing and commissioning and agreed between the engineer and the contractor. Under no circumstances shall the installation be used for drying out the building unless directed by the engineer or his representatives. 1.24
BUILDERSWORK
The main contractor shall be responsible for all necessary builderswork and making good associated with the services installation and associated works, with the exception of forming holes up to 50mm diameter, which shall be carried out by the contractor. The positions of all holes, chases etc are to be approved by the structural engineer before any work is carried out. Within two weeks of being notified of the acceptance of the tender, full builders work details shall be submitted to the engineer for approval, including drawings showing details of all bases, openings, flue entry positions etc throughout the building. Approval of any builders work drawings shall not exempt responsibility for accuracy or correctness. Any builderswork carried out incorrectly due to faulty dimensions, details, setting out etc shall be re-executed by arrangement without any further cost to the employer.
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PROTECT THE FOLLOWING
Where appropriate, all service authorities shall be notified of proposed Works not less than one week before commencing site operations. All incoming services shall be adequately protected to prevent damage and shall be maintained without interference of their operation or without consent of the Service Authority or Private Owners. If any damage results from the execution of Works the Contractor shall immediately notify the appropriate Service Authority and make arrangements for the work to be made good without delay to the satisfaction of the Services Authorities or Private Owners. Care shall be taken not to damage any existing roads, footpaths, existing features, existing property, adjoining property or the structural fabric of any buildings. The engineer may issue instruction or make other arrangements, as he deems necessary to repair rapidly, any essential services damaged during the execution of the works. Such arrangements shall not affect any liability to pay for making good. 1.26
UTILISATION OF BUILDING SERVICES
As soon as the installation is in the opinion of the engineer or his representative sufficiently advanced, the Employer shall be entitled to the beneficial use of any portion of the premises. His usage shall not in any way invalidate this contract nor will it be admitted as an excuse for a delay in the completion. The engineer or his representative will decide whether such use is practicable with safety and without detriment to the remaining works and whether or not such use constitutes section completion within the meaning of the conditions of the contract. The installation shall only be used for heat testing and commissioning when the following requirements have been fulfilled: a) Written advice of the date of testing and commissioning etc has been given to the engineer or his representative. b) Adequate insurance cover for the period of operation and full responsibility has been undertaken. c) A qualified and competent engineer is in attendance on plant and installation during the period of operation. d) Written confirmation shall be given to the engineer or his representative that the running of the plant prior to handing over shall in no way effect or invalidate the Defects Liability Period which shall commence on the issue of the Practical Completion Certificate. e) All costs arising from the four items above shall be included in the tender. The installation shall not be used either directly for, or in connection with, carrying out any other contract works without the approval or consent of the engineer or his representative.
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The permanent heating installation may be available for drying and controlling the humidity of part of the works except: a) The Employer does not undertake that it will be available. b) Written permission of the engineer or his representative and any other appropriate Contractors shall be obtained. c) Not until the installation has been satisfactorily tested and commissioned to the approval of the engineer or his representative will the installation be used. d) All costs arising and responsibility for the operation, maintenance and remedial work and arrangements for supervision and indemnification of the appropriate works shall be undertaken. e) The Employer will be indemnified against the reduction in manufacturers guarantee resulting from use before Practical Completion. f) Any additional insurance required would be implemented and any additional premiums paid. g) The Employer shall pay the cost of fuel used for drying purposes only if written permission or instruction is given by the Employer to allow the installation to be used for drying out. 1.27
ELECTRICAL WELDING
The employer is only required to supply electricity for normal power requirements in connection with the operation of hand tools, screwing machines etc. If a supply is required for electrical welding or any other purpose necessitating power in excess of 15 amps, then this must be provided by means of a portable generator without cost to the employer. 1.28
OPERATION OF PLANT
Full responsibility for the operation of the plant shall be undertaken by the contractor prior to the official handover of the building and the issue of the Practical Completion Certificate. Installations must be operated and attended solely by the contractor’s own personnel. The Tender shall include for the Contractors skilled staff to instruct the Employer's Staff in the operation of the installation. The Contractor shall make provision within the tender for three half-day training sessions of the employer’s staff or his nominated representative. 1.29
REDUNDANT MATERIALS
All redundant materials and equipment shall be disconnected and removed from site at suitable intervals throughout the Works and on completion. Unless otherwise stated, such materials shall become the possession of the Contractor and appropriate credit shall be allowed for the same. All empty packages, rubbish and unused materials and plant shall be removed and the site left in a clean and tidy condition.
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DAMAGE DUE TO OVERHEATING
The Contractor shall make good at their own expense any damage caused to the fabric of the building as a result of overheating and must ensure that all services and equipment installed are safe from being damaged or causing damage. 1.31
DAMAGE DUE TO FROST
The Contractor shall make good at their own expense any damage caused by frost, damp or rain to fittings or equipment supplied under the contract, as may be directed by the engineer. 1.32
COMMISSIONING
A period of time shall be included in the programme, for the witnessed commissioning and testing of the engineering services installations. 1.33
CRANAGE
If, during the duration of the works, crane facilities are required then the following conditions shall be met: a) Ensure that adequate third party insurance cover is provided and copies of the premium receipts shall be forwarded to the Employer prior to the commencement of the cranage Works. b) Submit to the Employer at least one week prior to any intended Works using a crane, copies of written approval from the Local Authorities (Police etc.). c) Ensure that adequate provision of full load distribution is given so as not to cause any structural or other damage of any nature during the course of the Works. 1.34
SETTING OUT AND FINISHES
All services, plant equipment or ancillary items shall be arranged in a neat and logical manner. Where items are repeated these should be arranged in a similar manner and symmetrically with equal spacing etc. where equal spacing is implied by the design drawings. All finishes of similar items or services shall be the same visually. All surfaces, directions, edges etc. shall be horizontal or vertical or at right angles to adjacent elements. All finished surfaces shall be free from visible damage or repairs. Services, plant equipment or ancillary items shall be parallel to each other. Any scratches, dents or other damage to external finishes shall be re-sprayed and repaired to the Engineers satisfaction.
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WORKING/INSTALLATION DRAWINGS
The Contractor shall be responsible for the preparation of fully dimensioned installation drawings of a standard and scale suitable for indicating installation details of all Works to the satisfaction of the Engineer. Working drawings shall include plantrooms, electrical and mechanical equipment rooms, switchrooms, pipework and ductwork, mechanical electrical and sanitary distributing services, supports and bracket details, wiring diagrams and must be issued for approval by the Engineer prior to fabrication or installation. The Contractor shall be responsible for setting-out services to integrate these Works within the structure taking into account all Works and features etc. Detail drawings of all plant equipment, vessels, tanks and electrical or control cubicles shall be issued for approval together with all associated wiring diagrams. The Contractor shall allow for a period of two weeks for receiving approval or comments from the Engineer. Working drawings shall also be submitted for approval or comments from the Structural Engineer where directed. Working drawings shall set-out all services and equipment taking into account the positions of all building elements and Works by others e.g., structural, mechanical, electrical, sanitary services, nominated Works and specialist items which make up the total project package. The Contractor shall be responsible for obtaining all current Architectural and Structural Engineers drawings and full details of all items, throughout the contract, in order to correctly set out the Works. The setting-out intentions of all works must be approved by the Engineer prior to installation by means of fully dimensioned working drawings. Where required, composite mechanical, electrical and sanitary services working drawings shall be provided as directed by the Engineer. Record drawings based on working drawings must indicate the actual final installation and must be devoid of any installation notes, which would be superfluous. Particular care shall be taken to prevent obstruction or restriction of service positions and access positions to engineering services. Services shall be arranged to prevent obstruction or restriction of general access, means of escape, walkways etc. 6 copies of all working drawings shall be submitted for approval and 8 copies of all approved drawings for distribution.
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Mechanical Specification
DRAWING FORMAT
Drawings required for the Contractor to produce shall include co-ordinated working drawings, fabrication drawings, builderswork drawings, wiring diagrams and schematics. Apart form wiring diagrams and schematics, all drawings shall be at 1:50 scale with plant areas and equipment arrangements and details 1:20 scale. Allowance shall be made in the tender for enlarged details showing multi-service sections at 1:10 scale. All drawing schedules showing scales and formats shall be submitted at the commencement of the contract for approval by the Engineer. The Contractors drawing capability may require assessment prior to acceptance by the Engineer. 1.37
RECORD DRAWINGS
A complete set of drawings shall be kept on site and as the Works proceed, any variations or modifications to the services shall be indicated in colour thereon. Facilities shall be afforded to the engineer to check these drawings as the Works proceed. Prior to the issue of the Practical Completion Certificate, a set of 'As Installed' drawings shall be issued to the engineer for approval. These drawings shall be to a scale not less than the contract drawings, clearly showing the layout of the plant and services etc. and marked 'As Installed'. The Practical Completion Certificate will not be issued until these drawings are approved. When approved, the above drawings shall be supplied to the engineer as follows: a) One set of negatives executed in ink b) Two sets of paper prints. c) One set on disc produced in CAD format using AutoCAD Release 2004. In addition, prints detailing plant rooms, plant, system schematics, control wiring, valve labels, switchgear room layouts, fuse boards, etc. shall be framed and glazed and shall be mounted in positions to be agreed by the engineer.
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Union Road – K130121 1.38
Mechanical Specification
OPERATING & MAINTENANCE MANUALS
Four weeks prior to handover and before the issue of Practical Completion Certificates a draft set of Operating and Maintenance Instructions shall be issued to the Engineer, for approval. The Operating and Maintenance Manual shall include the following: a) Specifically written information A4 size pages with typed text using double spacing. b) Drawings on A3 size sheets or larger size sheets reduced to A3 as appropriate. c) Carefully selected and edited standard published information to include only those items installed. Where editing is not appropriate, type out the relevant items and include in above. d) Schedules of equipment with manufacturers names, addresses and telephone numbers and reference numbers. e) Schedule of fuse charts. f) Schedule of valve numbering and operation. g) Set of paper prints of 'As Installed' drawings. h) Wiring diagrams of plant and interconnections and control wiring or equipment. The following information shall be provided for every item, component and/or system: a) Certified manufacturing drawings. b) A full description giving any special features. A full breakdown of the parts and the catalogue number of the constituent parts, together with duties, ratings etc. A schedule of all separate items. c) The guarantee period of any work where in excess of the warranty required under the conditions of the contract or inspections which the Contractor undertakes during the period. d) How to operate the item, component or system, special attention being paid to sequences of operations and time periods and delay in respect of, but not limited to:
Precautions, warnings and safety measures. Commissioning. Balancing. Starting. Running. Stopping. Emergency stopping. Temporary shutdown. Permanent shutdown. How to override.
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Union Road – K130121
Mechanical Specification
e) Type of consumable items to permit re-ordering of these items without reference to the contractor. f) How to maintain the items, components or systems.
Frequency of maintenance of all parts. Precautions, warning and safety measures. How to isolate plant or parts of plant. Routine preventive maintenance inspecting. Routine repairs and replacement. Fault finding, comprising faults, symptom cause, remedy. Major maintenance, special notes to facilitate major maintenance, e.g., lifting beams, hoists, removal of maintenance or service department of Contractor and manufacturers of major items of plant. Terms of maintenance contract recommended and offered by Contractor or suppliers. Emergency contact and procedures. Statutory inspections and tests. Give reference to special tools required and access to components or areas.
Following approval, two sets of the above documents in stiff backed ring binders shall be given to the Engineer one week prior to the handover inspections. The binders shall be A4 size, finished in welded PVC with 'Pull Open' four ring fittings and of a capacity to suit the intended contents. Following the engineer’s approval of the documents these shall be transferred onto CD ROM, including all manufacturers’ literature, test certificates etc, with two sets of CD discs being provided. The electronic copies of the manuals shall make use of Adobe Acrobat for access and navigation. The Practical Completion Certificate will not be issued until the approved Operating and Maintenance Manuals are handed over to the Engineer. In addition to providing operating and maintenance documentation relevant to the entire development as part of the health and safety file, the Contractor shall provide a tenants/occupiers handbook for each dwelling, with the format and content of the handbook being approved by the client. 1.39
GUARANTEES
The Contractor shall ensure that guarantees of equipment and the like are given in the joint names of the Contractor, and of the Employer and that the benefit of any guarantees which run beyond the end of the Defects Liability Period are passed to the Employer. 1.40
SPECIFIED EQUIPMENT
Where the Specification calls for any item of equipment from a specific manufacturer or distributor only these items shall be used. Where "equal or approved" items may be offered for the Engineers approval, these items shall offer the same performance and otherwise meet the Specification in all respects. Alternative items shall consume no more energy, not increase undesirable emissions, create no more noise or vibration, impose no greater loads on the structure, require no more servicing, not be constructed from inferior materials and have no disadvantageous effect on any other part of the system. 21
Union Road – K130121
Mechanical Specification
The procedure for requesting the Engineers approval shall be that the tender costs are based entirely on the named and specified items without exception and savings shall be separately identified for alternatives at the time of tender together with full details to enable comparison by the engineer. The contractor shall be responsible for the time required for submitting details of substitutions, for approval, without affecting the programme. The Engineer, at the contractor’s expense, shall remove any unauthorised substitutions from site on demand. The Engineers decision regarding alternatives shall be final and the contractor shall not be entitled to the reasons for the Engineers rejection of items offered for approval by the Contractors. 1.41
INSPECTION PRIOR TO COVER
All work to be covered or hidden including Works in ceilings, roof voids, floor voids or ducts and items to be insulated or boxed in shall be inspected, tested and approved prior to cover. All necessary tests and inspections shall be arranged with the Engineer giving a minimum of 5 days notice in writing. Any work covered or hidden without the written approval of the Engineer will be required to be uncovered at the Contractors own expense. 1.42
SUPERVISION
The Contractor shall provide an on-site engineer and sufficient supervisory staff having thorough experience of the class of work covered by the Specification, to the satisfaction of the Engineer. Particulars of the training and experience of proposed staff shall be submitted for approval before appointment. Services supervisory staff shall be responsible for the detailed co-ordination of the Works with other trades and for ensuring that the work done is in accordance with the Specification and complies within the programme. The involvement of services staff, i.e. full time or part time site attendance, shall be proposed by the contractor for approval by the engineer prior to commencement of the contract. 1.43
DEVIATION FROM DESIGN
Should a deviation from the design intent shown on the drawings or described in the specification be necessary or desirable because of site conditions, the contractor must notify the engineer at the time of submitting working drawings for approval. Any deviations from the design considered necessary during the installation due to works being carried out by other must be brought to the attention of the engineer and agreed prior to the commencement of such items.
22
SECTION 2 GENERAL & TECHNICAL SPECIFICATION FOR MECHANICAL SERVICES
Union Road – K130121
Mechanical Specification
SECTION 2 GENERAL & TECHNICAL FOR MECHANICAL SERVICES INDEX 2 GENERAL APPLICATION ............................................................................................ 26 2.01 PIPEWORK ............................................................................................................... 26 2.02 PIPEWORK & FITTINGS ............................................................................................. 27 2.03 ERECTION OF PIPEWORK .......................................................................................... 28 2.04 PIPEWORK SUPPORTS .............................................................................................. 29 2.05 PIPEWORK JOINTING ............................................................................................... 30 2.06 WELDED PIPEWORK ................................................................................................. 30 2.07 HEADERS ................................................................................................................. 31 2.08 FLANGED JOINTS ..................................................................................................... 32 2.09 PIPE SLEEVES .......................................................................................................... 32 2.10 FLOOR PLATES ......................................................................................................... 32 2.11 CONDENSATE DRAINS .............................................................................................. 33 2.12 DRAIN POINTS ......................................................................................................... 33 2.13 AIR VENTING OF PIPEWORK ..................................................................................... 33 2.14 TESTING OF METAL PIPEWORK ................................................................................. 34 2.15 CLEANING & PAINTING OF PIPEWORK ....................................................................... 34 2.16 VALVES.................................................................................................................... 35 2.17 GATE VALVES ........................................................................................................... 35 2.18 REGULATING & DOUBLE REGULATING VALVES ........................................................... 36 2.19 RELIEF VALVES ........................................................................................................ 36 2.20 GAS COCKS .............................................................................................................. 36 2.21 THERMOMETERS ...................................................................................................... 36 2.22 PRESSURE GAUGES .................................................................................................. 37 2.23 REMOTE PRESSURE GAUGES. .................................................................................... 37 2.24 PRESSURE & TEMPERATURE TEST PLUGS ................................................................... 37 2.25 IDENTIFICATION OF PIPEWORK ................................................................................ 38 2.26 VENTILATION DUCTWORK ........................................................................................ 38 2.27 TURNING & GUIDE VANES......................................................................................... 39 2.28 DAMPERS................................................................................................................. 39 2.29 FIRE DAMPERS/DUCT WRAP ...................................................................................... 39 2.30 ACCESS OPENINGS. .................................................................................................. 39 2.31 FLEXIBLE JOINTS. .................................................................................................... 40 2.32 FLEXIBLE CONNECTIONS. ......................................................................................... 40 2.33 GRILLES. ................................................................................................................. 40 2.34 AUTOMATIC CONTROLS ............................................................................................ 40 2.35 THERMAL INSULATION ............................................................................................. 41 2.36 THERMAL INSULATION OF PIPEWORK IN PLANT & TANK ROOMS ................................. 42 2.37 THERMAL INSULATION OF PIPEWORK IN ROOF SPACES AND SERVICES VOIDS............. 42 2.38 THERMAL INSULATION OF DUCTWORK. ..................................................................... 43 2.39 THERMAL INSULATION OF PLANT AND EQUIPMENT. ................................................... 43 2.40 IDENTIFICATION ...................................................................................................... 43 2.41 PAINTING ................................................................................................................ 44 2.42 ELECTRICAL CONTINUITY ......................................................................................... 44 2.43 PENETRATION OF FIRE BARRIERS ............................................................................. 44 2.44 COMMISSIONING & TESTING GENERAL ...................................................................... 44 2.45 MAINTENANCE OF PLANT DURING COMMISSIONING AND TESTING ............................. 45 2.46 COMMISSIONING AUTOMATIC CONTROL SYSTEMS ..................................................... 45 2.47 BOILER PERFORMANCE TESTS................................................................................... 46 2.48 HEATING SYSTEM PERFORMANCE TESTS ................................................................... 46 2.49 VENTILATION SYSTEM PERFORMANCE TESTS............................................................. 46 24
Union Road – K130121
Mechanical Specification
2.50 HOT AND COLD WATER SERVICES SYSTEM PERFORMANCE TESTS ............................... 46 2.51 ATTENDANCE TO DEFECTS OR FAILURES ................................................................... 46 APPENDIX A ........................................................................................................................ 47
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Union Road – K130121
2
Mechanical Specification
GENERAL APPLICATION
This section of the specification describes the standard of materials to be used and methods of installation. It shall be read in conjunction with each of the other sections of the specification. The Installer shall provide and install everything necessary to complete the installations, and should any portion of the works which would reasonable and obviously be inferred as necessary, not be expressly shown or specified, the Installer shall provide and execute all such works as an essential part of the contract. The whole of each installation must comply in every respect with the regulations and recommendations of the Local Water Authority, the Local Gas Board, the Fire Brigade, BS 6700 and the current edition of the Building Regulations including all amendments thereto. 2.01
PIPEWORK
Pipework shall be as detailed in the following: a) Mild Steel Pipe (LTHW and Gas Services) Mild steel pipework shall be manufactured in accordance with the provisions of BS 1387:1967 and subsequent amendments medium weight quality for LTHW and heavy weight for Gas. b) Copper or Plastic Pipe (LTHW and DHWS Services) Copper pipework shall be manufactured in accordance with the provisions of EN1057 R250 and BS 2871:1971 and subsequent amendments Table X. All pipe and fittings shall bear an appropriate mark to indicate that it has been manufactured in accordance with the provisions of the BSS. c) External Water Pipework Water pipes shall be of Blue Modified High Density polyethylene manufactured in accordance with the provision of BS 3284:1967 and BS 1972:1967 and their subsequent amendments and to the Class as specified by the Water Supply Bylaws. Any necessary adaptors for connection to valves and pipes of other materials shall be provided. Pipework laid in the ground shall be installed with care and in such a manner that pipework and fittings shall not be damaged due to ground movement. Consideration shall be given, particularly for non-metallic pipes, to the depth at which the pipe shall be laid, depending upon the size of the pipe, the location, width of the trench and the class of bedding upon which the pipe will lie. Buried cold water pipes shall be not less than 750mm below ground surface level as a protection against frost damage. d) Internal Cold Water Services Pipework All CWS pipework shall be run in copper or plastic pipe to EN1057 R250 and BS 2871 Part 1, Table X all as previously specified in "DHWS Services". e) Internal Gas Services Pipework Internal Gas Services Pipework shall be run in Black Mild Steel tube to BS 1387 "Heavy" grade and shall comply fully the latest Regulations of British Gas. 26
Union Road – K130121
Mechanical Specification
Trac Pipe (Gas Service) Corrugated stainless steel semi-rigid pipe and associated fittings for low-pressure pipework up to DN 50 to BS 7838. Where installed within unventilated voids or risers the pipework is to be housed in continuous flexible polyethylene tubing as Plastiflex GF or similar approved. with ventilation at either end. f) External Gas Service Pipework External gas service from the existing main to the gas meter housing in the building shall be carried out in yellow high density polyethylene tube, manufactured in accordance with the provision of BS 7281 and to the class as specified by the Gas Safety Regulations. 2.02
PIPEWORK & FITTINGS
Pipe fittings shall be as detailed in the following: a) Butt Welded Fittings Seamless carbon steel fittings for butt welding shall be manufactured in accordance with the provisions of BS 1965: "Butt Welded Pipe Fittings for Pressure Purposes" Part 1:1963 "Carbon Steel" and subsequent amendments. Butt welding fittings shall suit the associated pipework to which they are to be welded and shall have a wall thickness not less than that of the pipe. b) Copper Capillary and Compression Fittings Capillary fittings for use with copper pipe shall be of an approved soldered type with internal shoulders and incorporating the necessary solder integral with the fitting. They shall be manufactured in accordance with the provisions of EN1254 and BS 864 "Capillary and Compression Tube Fittings of Copper and Copper Alloy" Part 2:1971 "Metric Units" and subsequent amendments and the joints shall be made in accordance with the manufacturers instructions with regard to cleaning, tinning, flux and the application of heat. Compression fittings for use with copper pipe shall be of an approved manipulative type manufactured in accordance with the provisions of BS 864: Part 2:1971 and subsequent amendments Type A or Type B as specified for the service concerned. All necessary copper or plastic to iron adaptors for connections to valves and other equipment shall be provided. Gunmetal fittings shall be used when specified for the service concerned. Capillary or compression fittings for use under conditions where de-zincification of the alloy is liable to be experienced shall be of gunmetal or other zinc less alloy. Where pipework is to be chromium plated, compression fittings shall be used and shall be Type B.
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Union Road – K130121 2.03
Mechanical Specification
ERECTION OF PIPEWORK
All pipework shall be erected to present a neat and tidy appearance, arranged to follow the contour of walls and other structural members of the building. It shall give maximum headroom and avoid the obstruction of windows and doorways. Pipework shall be installed with due consideration for the location of other services with which its arrangement shall be co-ordinated. Allowance should also be made during its erection for the thickness of insulation thereon. Vertical pipes are to be plumb and shall be fixed with 25mm clearance between the finished face of the wall and the pipe or insulation thereon. Horizontal pipes near floors are to be located with at least 75mm clearance between the finished face of the wall and the pipe or insulation thereon. Pipes shall be erected with continuous gradients rising in a suitable direction to clear air and where a horizontal pipe is reduced in size in the direction of an air vent it shall be provided with an eccentric reducing fitting. The gradient shall be appropriate to the service concerned and unless otherwise indicated on the drawings are to be as follows: a) Heating and Chilled Water (mains) 1 in 500 b) Gas and Compressed Air (mains) 1 in 500 Cutting and shutting will not be permitted unless approved by the Engineer. Pipework shall be free from corrosion and the ends of all lengths, and cuts from standard lengths, shall be trimmed square and reamed to the full bore of the pipe to remove burrs; the swarf shall be cleared from the pipe. Joints will not be permitted within the thickness of walls, floors, ceilings or other equally inaccessible positions. All pipework, valves, fittings and equipment forming the general installations shall be erected in a manner that will permit easy dismantling and convenient accessibility for future repairs and replacements for items of plant. Flanges or union connections shall be provided at valves and at suitable intervals to facilitate erection of the pipework. Particular attention is drawn to welded pipework where sufficient flanged joints shall be provided to limit the length of pipe sections for convenient handling. Flanges or unions to facilitate removal shall arrange connections to equipment. Connections over 50mm diameter are to be made with flanges, but on pipes 50mm diameter and under union connections may be used. Butt-welded fittings shall be used for all metal pipes greater than 65mm bore. Bends and tees shall be of easy sweep or pitcher pattern wherever possible, appropriate, and convenient. The use of bushes and hexagonal eccentric reducing nipples for reducing the size of fittings will not be permitted. Long screw connectors with back nuts will not be allowed. Square elbows and square tees as well as straight or malleable nipples are not to be used unless authorised by the Engineer. Square tees and round elbows shall be used for thermometer, thermostat, gauge and drain connections and air vents. Round elbows may be used where pipework is exposed in rooms and where the use of an easy sweep bend would throw the centre of pipe beyond an acceptable distance from the wall. Flat seated unions shall not be used; unions shall have bronze conical seats ground in. All pipe systems shall be thoroughly flushed out when the installation has been completed. 28
Union Road – K130121
Mechanical Specification
All pipes, valves, fittings etc., shall be free from corrosion and internal obstruction. Pipework showing signs of corrosion shall not be fitted. All pipework and supports, other than galvanised or copper, shall be cleaned and painted one coat of red oxide paint to afford protection during the course of erection. The paint shall be applied immediately after the pipework has been installed. Special care is to be observed to prevent dirt and rubbish entering the open ends of the pipes during erection, and the open ends are to be temporarily fitted with plastic or metal caps, plugs or blank flanges during the progress of the work. Improvised plugs of wood, rag or paper shall not be used. In the event of failure to comply with this instruction the Engineer shall order pipework to be dismantled and cleansed internally to the extent, which he may consider necessary; at no cost to the Employer. A valve terminating a disconnected pipe is not considered satisfactory to prevent the entry of rubbish. The open end of the valve shall be fitted with a plug or flange as stated above. All ferrous pipework and fittings other than galvanised shall be protected by one coat of red oxide paint and this paint shall be applied as the work progresses. 2.04
PIPEWORK SUPPORTS
All necessary brackets, clips, hangers, and other pipe supports including bolts, nuts, washers, backing plates, screws and plugs which shall be provided for the fixing and alignment of all pipework, shall be approved by the Engineer. All pipework shall be supported at the maximum centres given in the schedule included in this specification. In the event of two or more pipes being carried by a single support the spacing shall be selected for the shorter interval. Under no circumstances shall a larger pipe be supported from a smaller pipe. All supports for steel pipes shall be of a ferrous material and shall be galvanised where used with galvanised pipe. Pipework support distances in metres shall be: Nominal bore of pipe (mm) 15 20 25 32 40 50 65 80 100 125 150 200
Steel Vertical 2.0 2.5 2.5 2.5 3.0 3.5 3.5 4.0 4.0 4.5 5.0 5
Copper
Horizontal 2.0 2.5 2.5 2.5 3.0 3.5 3.5 4.0 4.0 4.5 5.0 5
29
Vertical 1.5 1.5 1.5 1.5 2.0 2.0 2.0 2.5 2.5 3.0 3.0 -
Horizontal 1.5 1.5 1.5 1.5 2.0 2.0 2.0 2.5 2.5 3.0 3.0 -
Union Road – K130121
Mechanical Specification
All supports for copper pipes shall be of polished brass where exposed to view; elsewhere, they shall be rough finish. No ferrous supports will be permitted for non-ferrous pipes. Where copper or steel piping is normally exposed to view in occupied places, the supports shall be spaced at intervals one-half of those listed above, or as specially detailed elsewhere in this Specification or on the drawings. 2.05
PIPEWORK JOINTING
Screwed joints for steel pipes shall be made in accordance with the provisions of BS 21:1973 "Pipe Threads for Tubes and Fittings where Pressure Tight Joints are made on the Threads" and subsequent amendments. Screwed joints for copper pipes shall, unless otherwise specified, be made in accordance with the provisions of BS 21:1973. The joints shall be clean threaded, pulled up tightly and made with an approved jointing compound and long strand hemp. After joints have been formed all surplus hemp shall be removed and the joint wiped clean as the work progresses. When for the purpose of threading, pipes are held in a vice, care shall be taken to ensure that the surface is not damaged. Any pipework so damaged shall not be fitted. For galvanised tube care shall be taken to ensure that threads are carefully cut so that the number of exposed threads are minimised. Exposed threads shall receive a coat of protective red oxide paint after each joint has been made. If the bead of a fitting is damaged during the installation the fitting shall be replaced. 2.06
WELDED PIPEWORK
Pipework for welding shall be supplied with plain ends, and the bores at the end of adjacent pipes are too matched on site and bevelled to an 80 degree included angle of bevel. All welding shall be carried out by welders holding a current recognised certificate of competency for each method of welding, which shall be submitted to the Employers' Agent for examination and approval. Welds made without this provision will be rejected. Pipes up to 150mm bore may be welded by the metal-arc or oxy-acetylene process but for pipes larger than 150mm the metal-arc process shall be in accordance with the provisions of BS 2971: Class II "Metal-arc Welding of Steel Pipelines" and "Pipe Assemblies for Carrying Fluids" and subsequent amendments and the recommendations of the Institute of Welding, using covered electrodes to BS 639:1976 "Covered Electrodes for the manual metal-arc Welding of Carbon and Carbon Manganese Steel" and subsequent amendments. No backing rings are too used and joints shall have external reinforcement. Earthing clips shall be of steel and are to be attached to the pipe itself - earthing from pipe fixings will not be permitted. Arrangements shall be made for the provision of an electrical supply for welding; or alternatively, for the supply of an appropriate portable generator. Any charges so incurred shall be included in the Tender. Oxy-acetylene welding of joints shall be in accordance the provisions of BS 1821: 1857 "Class 1 Oxy-acetylene Welding of Steel Pipelines and Pipe Assemblies for Carrying Fluids" and subsequent amendments; and with the publication "Welding of Mild Steel Pipes 1970" published by the Heating and Ventilating Contractor Association and in accordance with the provisions of BS 1724:1959 30
Union Road – K130121
Mechanical Specification
"Bronze Welding by Gas" and subsequent amendments for copper pipes. Care shall be taken to ensure that the welding metal or flux does not project into the bore of the pipe. All welds shall be of good clean metal, free from slag inclusions and porosity, of even thickness and even contour, well fused with the parent metal, annealed and hammered upon completion and finished smooth. All welded joints are to be stamped in a suitable position adjacent to the weld, to enable the identity of the welder to be established. The identification coding shall be made available to the Engineer prior to the commencement of installation. The Engineer shall have the Authority to request that 2% of all welds be cut out for examination and testing, such tests will be applied to any welded joint at the discretion of the Engineer. The Engineer shall be present when welds are to be cut out and to witness such tests that may be considered necessary to ensure that the full bore of the pipe is maintained at each welded joint. Bending tests, macro etching tests and any other method of testing may also be requested if considered necessary by the Engineer and will be carried out in accordance with the provisions of BS 709:1971 "Methods of Testing Fusion Welded Joints and Weld Metal in Steel" and subsequent amendments. The entire cost of cutting out, testing and re-instalment shall be included in the Tender. After inspection and any necessary tests, all welded joints shall be protected by one coat of red oxide paint. If any such weld is found to be inferior and not up to the standard required, two further welds by the same welder will be similarly tested and if these also are found to be unsatisfactory then the welder shall be taken off the works and all welds made by that welder shall be cut and remade, the entire cost of the cutting out, re-instalment, testing and painting shall be at the Contractors own expense. 2.07
HEADERS
Where required, headers shall be of neat construction with welded flanged ends and provided with all necessary flanged stools to suit the sizes and positions of connections. The stools shall be of sufficient length to clear the thickness of any insulation thereon and permit the insertion of flange bolts. All spare outlets that may be specified shall be provided with valves appropriate to the service concerned and such spare valves shall be blanked off with plugs or blank flanges as may be appropriate.
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Union Road – K130121 2.08
Mechanical Specification
FLANGED JOINTS
All flanges for use with steel pipes shall be manufactured from mild steel in accordance with the provisions of BS 4504 “Flanges and Bolting for Pipes Valves and Fittings" Part 1:1969 "Ferrous" and subsequent amendments, and to the Table appropriate for the pressure specified. Flanges for use with copper pipes shall be manufactured from bronze or gunmetal in accordance with the provisions of BS 4504: Part 2:1972 "Copper Alloy and Composite Flanges" and subsequent amendments and to the Table appropriate for the pressure specified. Flanges shall be machine faced, trimmed at the edges and spot faced for nuts. Bolt holes shall be drilled and not subsequently expanded. Flanges for welding shall be plain faced slip on neck type flanges. The tube shall terminate inside the bore 3mm from the face of the joints and a sealing run shall be applied. All flanged joints shall be flush and truly aligned and shall employ full faced Taylor’s corrugated metal ring coated on both sides with an approved jointing compound. Corrugated metal rings for jointing oil pipes shall be of steel or nickel; all others shall be of brass. All bolts and nuts shall be hexagonal headed bright steel in accordance with the provisions of BS 4882:1973 "Bolting for Flanges and Pressure Containing Purposes", and no more than two threads shall project beyond the nut. For the purpose of cold-draw for expansion compensators, high tensile steel bolts shall be used. 2.09
PIPE SLEEVES
In all cases where pipes pass through walls, floors, ceilings and footings, sleeves shall be provided and it shall be ensured that the sleeves are correctly built in. Sleeves shall in no case be used as pipe supports. Sleeves in load-bearing walls or footings shall be cast iron pipe. Sleeves in non load bearing walls, floors, ceilings and partitions shall be in copper or mild steel to suit the particular pipe material. Inside diameter of sleeves shall not be less than 12mm larger than the outside diameter of the pipe, except where pipes pass through load bearing walls or footings where sleeves shall be 100mm larger than the outside diameter of the pipe. 2.10
FLOOR PLATES
Where exposed to view, pipes and tubes passing through walls, floors, ceilings, partitions and false ceilings of occupied rooms shall be fitted with a heavy chromium plated die cast zinc alloy masking plate. Such plates shall be split on the diameter, being a snug fit to the pipe concerned and provided with countersunk h9oles for set screws.
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Union Road – K130121 2.11
Mechanical Specification
CONDENSATE DRAINS
The pipes and fittings for condensate drains shall be light gauge copper tube to EN 1057 R250 and BS 2871 Part 1, Table x 1987 with “T” Mark in addition to “Kite mark”. The Installer is to allow for the condensate drain from all evaporators, to run under gravity to the nearest drain position. Wherever possible the use of condensate pumps is to be avoided, however and should it prove necessary, then a suitable selected quiet running pump is to be utilised and allowed for by the Installer. 2.12
DRAIN POINTS
Adequate provision shall be made for emptying all sections of all services as required for maintenance purposes whether indicated on the drawings or not. All boilers, cylinders, calorifiers and pumps together with all low points of pipework within plant rooms shall be provided with draw-off gland cocks. All other low points shall be provided with drain taps. Drain taps shall also be provided on the flow and return of all heating and hot valves, and shall be located on the isolated side of the valves whether indicated on the drawings or not. Drain taps shall be in accordance with the provisions of BS 2879:1957 "Draining Taps Screw Down Pattern" and subsequent amendments Type A with lockshield. 2.13
AIR VENTING OF PIPEWORK
Full provision shall be made for the air venting of the systems, whether or not shown on the drawings. All exposed air bottles, automatic vents and drip pipes where required shall be properly insulated and protected against frost. Air vents shall be provided at all high points in the pipework. They shall be installed at the highest point of the sections that they are intended to vent. Air bottles on pipework up to and including 80mm bore shall be manufactured from 50mm bore pipe. 100mm bore and over from 100mm bore pipe. All shall be 250mm long with welded end caps and be complete with 8mm copper pipe brought down from the top of the air bottle to within reach of ground floor level and fitted with 8mm lockshield needle valve complete with key. Automatic air vents shall be used where required and shall have gunmetal bodies with not less than 15mm connections, copper or stainless steel floats, guides and non-corrodible needle valves. In all cases the air vent shall be protected by a lockshield pattern stop valve and the discharge from the air vent shall be 12mm copper pipe which shall discharge over an agreed gully, sump or other convenient position.
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Union Road – K130121 2.14
Mechanical Specification
TESTING OF METAL PIPEWORK
All pipework shall be tested hydraulically after assembly on site and before any insulation is applied or pipework made inaccessible, to a pressure equal to twice the working pressure. If the test pressure is greater than 6 bar the test pressure may be one an a half times the working pressure. The minimum test pressure for water pipes shall be 3 bar and for gas pipes the test pressure shall be in accordance with the requirements of the Gas Company concerned. Hydraulic pressure tests shall be carried out by means of a force pump which shall be locked after the desired pressure is obtained. The test pressure shall be registered at the lowest part of the system being tested and maintained for a period of two hours during which time all parts must remain completely watertight and no pressure loss becomes evident on the gauge. Any leakage must at once be made good and the pressure test repeated until the desired test conditions are maintained. During this period all welds on steel pipe shall be well hammered. Boilers, chillers, cylinder pumps and any other ancillary items of equipment which may be liable to damage by the test pressure, are to be isolated or suitably protected during the test, and all necessary precautions taken. Any damaged equipment shall be replaced. In order not to delay the works, sections of the pipework shall be pressure tested independently as the work progresses. All necessary plugs, caps or blank flanges shall be provided for testing and these shall be removed after the pressure test has been approved. Seven days clear notice of any test shall be given to the Engineer in writing in order that where deemed necessary, the Engineer shall witness the test. 2.15
CLEANING & PAINTING OF PIPEWORK
At completion of the work all rubbish and superfluous materials shall be cleared away and the whole of the apparatus is to be clean and in working order. All pipe, fittings, valves and other items of equipment are to be clean and any grease, dirt, metal cuttings, sludge etc, which may have accumulated during the work shall be removed. Any discolouration or other damage to parts of the building, its finishes or furnishings shall be made good without additional cost to the Employer. Pipework, fittings, valves, plant etc., except that which is thermally insulated or which is otherwise specified to the contrary, shall be painted.
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Union Road – K130121 2.16
Mechanical Specification
VALVES
Valves shall be in accordance with the following details, unless indicated otherwise on the drawings or supplementary specification. Valves and cocks shall be provided wherever required to:a) b) c) d) e) f) g)
Isolate individual items of equipment. Separately isolate duplicate items of equipment. Isolate wings or sections of the installation. Isolate hot and cold-water draw-offs, either separately in small ranges or groups. Isolate mains cold-water services at entry to this building. Isolate supplies to and services from tanks and cisterns. Regulate branch circulations on heating and HWS installations, including circulation to individual radiators, convectors, coils etc.
Where special tools are required for adjusting or operating valves, duplicate sets shall be supplied. The installer shall ensure valves are selected to suit the pipework configurations e.g. angled or straight radiator valves and all valves shall be compatible with the pipework materials and fittings used. Valve specifications are included in Section 3 of this Specification. Flanges or unions shall be incorporated to facilitate removal of all valves. Valves shall be positioned in a neat manner and angled such that handles and levers are arranged for easy operation without obstruction from other services or items. Where valves are not readily accessible and access panels (by others) would be required for access, valves should be grouped. All valves must be Water Authority approved, Water Research Council listed or Gas Board approved as appropriate. 2.17
GATE VALVES
Cast Iron flanged gate valves shall be in accordance with the provisions of BS 5150 "Cast Iron Wedge and Double Disc Gate valves for General Purposes" and subsequent amendments. They shall be provided with bronze trim and, unless otherwise specified, shall have non-rising spindle. Valves shall be suitable for the working pressure of the service concerned. Gunmetal and brass gate valves shall be in accordance with the provisions of BS 1952:1964 "Copper Alloy Gate valves for General Purposes" and subsequent amendments. They shall be screwed, flanged or capillary type to suit the associated pipework and unless otherwise specified, shall have non-rising spindles. Gate valves shall be suitable for the working pressure of the service concerned. Gunmetal gate valves for oil lines shall have rising spindles with back seatings.
35
Union Road – K130121 2.18
Mechanical Specification
REGULATING & DOUBLE REGULATING VALVES
Regulating and double regulating valves shall be cast iron construction with bronze trim conforming to the provisions of BS 5152. The valves shall be of oblique pattern, suitable for the service concerned, with characterised regulating plug and regulating sleeve giving proportionate regulation. The valve spindle and bonnet shall have back seating to enable it to be repacked under pressure when fully open. Unless otherwise specified, regulating valves shall be provided with a hand wheel. 2.19
RELIEF VALVES
Relief valves shall be of the full bore, enclosed spring loaded, lock up type with a discharge pipe there from turned down to floor. Relief valves for LPHW Heating systems shall be adjusted to lift at 0.7 bar in excess of the working pressure or at 3.0 bar, whichever is the greater. 2.20
GAS COCKS
Gas cocks shall be quarter turn copper alloy ball valves with P.T.F.E. seats and seals manufactured to the relevant requirements of BS 5494:1978 and as tested and certified by British Gas. 2.21
THERMOMETERS
Thermometers shall be of a suitable type and pattern to permit them to be easily readable in the position in which they are to be fitted. Thermometers shall be of the angle pattern dial type. Each thermometer shall be graduated to suit the temperature range. Thermometer pockets shall be filled with graphite grease. Dial-type thermometers shall be 100mm diameter on pipework up to 80mm and for larger pipes 150mm diameter with chrome plated bezel and shall be vertical or horizontal pattern with pocket. Thermometers for air ducts shall be dial type 100mm diameter with back entry 300mm stems with sliding flanges as manufactured by Brannan Ltd. Pipeline Thermometers shall be Alpha range as manufactured by Brannan Ltd. Within each plant room and boiler room a model 95/009/2 wall mounted thermometer as manufactured by Brannan Ltd.
36
Union Road – K130121 2.22
Mechanical Specification
PRESSURE GAUGES
Pressure gauges shall be of the 'Bourdon' type with 100mm diameter dial on pipework up to 80mm and for larger pipes 150mm diameter with chrome plated bezel and shall be vertical or horizontal pattern with pocket. Each gauge shall be calibrated and graduated in bar for a pressure range of zero up to twice the working pressure. The gauge dial shall be marked with a red index line indicating the static pressure with the system full and the boilers, pumps and other such equipment at rest. For pressurised systems an additional green index line on the gauge dial shall indicate the normal working pressure range of the installation concerned. All gauges shall be provided with a 10mm connection to the associated pipework, syphon, and a lever handled gauge cock for isolation. Pressure gauges shall be Alpha range as manufactured by Brannan Ltd. 2.23
REMOTE PRESSURE GAUGES.
These shall be provided to all heating and HWS pump sets where indicated on the drawings or specified elsewhere. The pressure gauges shall be connected by light gauge copper tubing, syphons and cocks, one to the suction side and one to the delivery side of the pumping set. The above shall conform to the following specification: Gauges: Generally as specified for pressure gauges. Syphons: Shall be 10mm diameter ring pattern manufactured from Gunmetal. Cocks: Shall be 10mm diameter and manufactured in brass. 2.24
PRESSURE & TEMPERATURE TEST PLUGS
Self seating test plugs shall be provided at strategic points as appropriate for the measurements of temperature and pressure. The test plugs shall be suitable for the system operating temperature and pressure. Generally test plugs shall comprise a self-sealing valve core enclosed within a brass body fitted with a sealing cap with gasket. The plug shall be screwed into a 6mm half socket welded to the pipe. One thermometer and one pressure gauge for each range of conditions, for use with test plugs, shall be provided. Test plugs and ancillaries shall be as manufactured by Brannan Ltd.
37
Union Road – K130121 2.25
Mechanical Specification
IDENTIFICATION OF PIPEWORK
All new pipes shall be identified by code indication colour bands in accordance with BS 1710:1975 Appendix D. Colour bands shall not be provided on pipes which are to be painted to match internal decorations. Direction of flow indicating arrows shall be applied to all pipework. 2.26
VENTILATION DUCTWORK
a) Galvanised Steel Ductwork Galvanised steel duct shall be constructed from strip mill cold-reduced sheet steel continuously hot dip galvanised to BS 2989:1975 "Hot Dip Galvanised Steel Sheet and Coil" and subsequent amendments – Grade 22 Coating type C, and shall be fabricated in accordance with the recommendations in the HVCA specification DW 144 issued by the Heating and Ventilating Contractor Association, ESCA House, 32-34 Palace Court, Bayswater, London W2 4JG. b) PVC Ductwork PVC ductwork shall be constructed from unplasticised polyvinyl chloride in accordance with the provisions of BS 3506:1969 "Unplasticised PVC Pipe for Industrial Purposes" and subsequent amendments to Class O or from pressed or extended unplasticised polyvinyl chloride sheet in accordance with BS 3757: "Rigid PVC Sheet" Part 1:1964 "Pressed Steel" and subsequent amendments and Part 2:1965 "Calendered and Extruded Sheet" and subsequent amendments. It shall be fabricated in accordance with the recommendation of HVCA specification DW 151 UPVC issued by the Heating and Ventilating Contractor Association, ESCA House, 32-34 Palace Court, Bayswater, London W2 4JG. Where PVC ductwork is to be thermally insulated or is not normally visible, Type A2 sheet shall be used; elsewhere, Type A1 shall be used. c) Ductwork Fittings Bends, branches, tees, transformations and other fittings shall be constructed from the same material and to the same thickness as the associated straight ductwork and shall confirm with the standard of fittings prescribed in the appropriate HVCA specification for the ductwork material concerned. d) All balancing dampers, fire stop dampers, air turning vanes and access points shall accord with the relevant clauses of DW 144 and the Local Fire Officers requirements. (e) Semi-rigid ducting to be aluminium self supporting type.
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Union Road – K130121 2.27
Mechanical Specification
TURNING & GUIDE VANES.
Where radiused ductwork bends in accordance with the HVCA Specifications cannot be accommodated owing to space restrictions, the Installer shall provide turning vanes of the double skin roll formed type, as manufactured by Henry Hargreaves & Son Ltd. “Airoturn” type, or equal and approved. 2.28
DAMPERS
Balancing dampers shall be provided where shown on the drawings and where necessary to regulate and balance the system. Dampers on grilles or diffusers shall be used for fine or secondary control. All dampers shall be sufficiently rigid to prevent fluttering. Unless otherwise indicated the air leakage past dampers in the fully closed position shall not exceed 5% of the maximum design airflow in the duct. All duct dampers except fire dampers and self-closing dampers shall be fitted with locking devices and position indicators. Dampers shall be generally in accordance with the appropriate HVCA Specification(s). Balancing dampers shall be of standard unsealed airfoil aluminium blade with end caps, while isolation dampers shall incorporate side seals and low leakage blades with PVC seals. 2.29
FIRE DAMPERS/DUCT WRAP
Where indicated on the drawings and generally on every ventilation duct passing through fire barriers (i.e. floors etc), fire dampers OR duct wrap are to be installed. Each fire damper/fire wrap assembly shall be held in the open position by a fusible link (generally set to release at a temperature of 70°C) and all blades must be weighted to ensure immediate closure on release of the link. All fire damper blades shall be located out the air streams. Where dampers cannot be accommodated within the wall or floor thickness these shall be installed in accordance with the publication ‘Installation methods for fire and smoke dampers’ produced by Advanced Air Ltd. Details of all such fixings must be submitted for approval prior to installation. The fire damper shall be in accordance with the 1976 Building Regulations No. 1676, and in particular Part E9, paragraph 9 (a) (I), and to the requirements of the Building Inspector. 2.30
ACCESS OPENINGS.
Access openings are to be provided adjacent to all equipment that requires maintenance, frequent replacing, cleaning or inspection (e.g. Fire damper fusible links etc). These openings shall be rigidly framed and fitted airtight covers so designed as to be simply and speedily removed and refixed. Access panels shall be carefully positioned such that access to fusible links can be readily achieved and other services (i.e. mechanical or electrical) must not interfere with such access. Access openings shall be 0800 series as manufactured by Advanced Air (UK) Ltd Tel No. 01284 701356.
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Union Road – K130121 2.31
Mechanical Specification
FLEXIBLE JOINTS.
Flexible joints shall be provided on fan inlet and outlet connections and elsewhere on the ductwork where indicated. They shall be of the full cross sectional area of the mating fan inlet or outlet or duct section. The ends of the ducts or the duct and the fan connection shall be in line. Flexible joints shall consist of, or be protected by, material having a fire penetration time of at least 15 minutes when tested in accordance with BS 476:Part 1:Section 3. The material shall be of the glass fibre cloth type: canvas will not be accepted. The width of the joints from metal edge to the metal edge shall not be less than 80mm and not more than 250mm. 2.32
FLEXIBLE CONNECTIONS.
Where flexible connections are indicated or required between rigid ductwork and particular components or items of equipment the internal diameter of the flexible duct shall be equal to the external diameter of the rigid ductwork and of the spigot served. The use of flexible duct between rigid sections of sheet metal ductwork to change direction of plane will not be permitted except where indicated or expressly authorised by the Engineer. All flexible joints other than fan inlet connections shall be between flanged ends. The flexible material flange shall be backed by an angle or flat iron flange and the flexible joint shall be securely held between the metal flanges. Flat iron bands used with fan inlets shall not be less than 5mm thick. 2.33
GRILLES.
All grilles or air diffusers and louvres of the sizes and types indicated on the drawings or as described elsewhere shall be supplied and fixed by the Installer. As part of the commissioning requirements the Installer shall test and balance the air flow from each grille or diffuser in accordance with the air quantities indicated on the drawings or provided for commissioning. 2.34
AUTOMATIC CONTROLS
The automatic control systems shall be electrically operated and shall provide temperature, motor and equipment control, plant protection and fault indication. a) Electrical Wiring All electrical wiring to and from control panels, sensors, detectors, motors, equipment etc., shall be carried out in accordance with the relevant sections of the Electrical Services Specification. b) Control Systems A Controls Specialist shall be used for supply, installing and commissioning the general control equipment and panels required to form the Automatic Control System. c) Exchange of Information The Contractor shall be responsible for obtaining all necessary detailed electrical information for the equipment provided under the Contract and for supplying such information to the Controls Specialist.
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Union Road – K130121
Mechanical Specification
The Contractor shall thereafter be responsible for obtaining control panel wiring diagrams and similar details from the controls specialist and issuing these for approval/comment as required. The Contractor shall also be responsible for obtaining and issuing full details of all electrical connections, terminal numbers and other such information as may be necessary for full and proper wiring to and from control panels, plant, sensors, detectors, control valves, controllers, motors etc. 2.35
THERMAL INSULATION
The Tender shall include all thermal insulation work, which shall be carried out by an approved specialist Thermal Insulation Sub-Contractor. Only skilled operators shall be employed. The thermal insulation shall comply in every respect with the 1976 Building Regulations No. 1676 and in particular Part ‘B’ relating to thermal insulation of pipes carrying heated fluids. In this respect, the thermal insulation thickness shall comply with Bs. 5422:1977. The thermal insulation specialist shall be acquainted with all the conditions of the works, including specification, programming, hours of working etc, and he shall complete the work within such programme. The thermal insulation work shall not be commenced, unless otherwise approved in writing, until the whole of the installation has been completed and tested as set out in the relevant pipework, plant and air distribution sections of the specification. Alternative materials or methods may only be used with express permission of the Engineer in writing and full details, test certificates etc, must be submitted in respect of any proposed alternative. Test certificates shall be submitted to the Engineer in respect of all materials classified under BS 476 Part 7:1971. Cold water feeds and open vents where running in the boiler room shall be lagged as the specification for the heating or cold water pipes respectively. All exposed insulation faces (e.g. flanges, valves etc) shall be capped with aluminium ‘In-Ends’ or similar. All thermal insulation work shall be carried out with no form of ‘Heat Bridge’ being present, which would affect the finish of the insulation. All insulation damaged or subject to failure due to ‘heat bridging’ shall be replaced at no cost to the Employer. All thermal insulation to pipework and ductwork conveying cold fluids/air shall be continuously vapour sealed. Under no circumstances shall pipes be married together with insulating material.
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Union Road – K130121 2.36
Mechanical Specification
THERMAL INSULATION OF PIPEWORK IN PLANT & TANK ROOMS
a) Heating and HWS Pipework: Heating, hot water, cold feed, cold water main, cold water down service and open vent pipe work shall be individually insulated and finished with bright aluminium foil facing. The sections shall be applied in lengths, cut longitudinally into two halves securely taped on with 25mm wide self-adhesive PVC tape and then enclosed with 24 gauge aluminium sheeting, secured with aluminium or cadmium plated self-tapping screws. 3
The pipework thermal insulation shall be Kingspan Kooltherm zero ODP 35 kg/m CFC-HCFC free rigid phenolic insulation with a class O fire rating with phenolic spacer blocks at brackets around the pipe as manufactured by Kingspan Insulation. b) Flanges and Valves: Flanges and valves above 32mm shall be fitted with purpose made removable bags/muffs with Velcro fasteners. 2.37
THERMAL INSULATION OF PIPEWORK IN ROOF SPACES AND SERVICES VOIDS.
Heating, HWS, Cold Fees, CWM, CWDS and Open Vents: Heating, hot water, cold feed, cold water main, cold water down service and open vent pipe work shall be individually insulated and finished with bright aluminium foil facing. The sections shall be applied in lengths, cut longitudinally into two halves securely taped on with 25mm wide self-adhesive PVC tape 3
The pipework thermal insulation shall be Kingspan Kooltherm zero ODP 35 kg/m CFC-HCFC free rigid phenolic insulation with a class O fire rating with phenolic spacer blocks at brackets around the pipe as manufactured by Kingspan Insulation. Insulation shall be finished with ‘Bright’ Class O reinforced foil covering or equal. Where bends and off-sets occur the insulation shall be tailored to suit. Hot water services circulation pipework shall be insulated throughout. The thickness of the pre-formed glass fibre sections shall be as follows:Pipe Size 15/15 20/22 25/28 32/35 40/42 50/54 65/67 8076 100/108 125 150
Insulation 15mm 15mm 20mm 20mm 20mm 20mm 20mm 25mm 25mm 25mm 25mm 42
Union Road – K130121 2.38
Mechanical Specification
THERMAL INSULATION OF DUCTWORK. 3
Insulation shall be Kingspan Kooltherm zero ODP 35 kg/m CFC-HCFC free rigid phenolic insulation with a class O fire rating duct insulation system 20mm thick, with aluminium foil vapour barrier jacket. 3
Circular ductwork shall be provided with Kingspan Kooltherm zero ODP crocodile strips 60 kg/m . Rectangular ductwork shall be provided with Kingspan Kooltherm zero ODP duct support inserts 60 3
kg/m . Plantroom ductwork shall be insulated with insulation as described above and covered with 24 gauge aluminium sheeting, secured with aluminium or cadmium plated self-tapping screws to give full weather protection. Exposed ductwork shall be insulated with insulation as described above and covered with PIB and 24 gauge aluminium sheeting, secured with aluminium or cadmium plated self-tapping screws to give full weather protection. 2.39
THERMAL INSULATION OF PLANT AND EQUIPMENT.
Internal Water Storage Tanks: Internal water storage tanks shall be insulated with 50mm non fibrous fire resistant mineral wool slabs, encapsulated by the manufacturer with a GRP outer covering. All pipe connection points to the tanks shall be sealed by the manufacturer. The tank insulation shall conform to BS 6700 and Water Authorities requirements. 2.40
IDENTIFICATION
After the thermal insulation and cladding as required has been completed and accepted the whole of the installation shall be identified in full compliance with BS 1710 & BS 4800. Pipeline contents shall be identified by purpose made coloured identification bands securely fixed to the manufacturers recommendations. Adjacent to each identification band self adhesive labels having white lettering shall be attached identifying the pipeline contents. Self adhesive white flow directional arrows shall be attached to the identification band in the direction of flow of the pipeline contents in accordance with Appendix A. All uninsulated pipelines shall be painted in accordance with BS 1710, unless otherwise approved or described by the Engineer for aesthetic reasons. Each and every valve shall be complete with a valve tag, having a reference number relating to the valve chart specified elsewhere. Each valve tag shall be manufactured from 25mm diameter traffolyte having white background and black engraved reference number 12mm in height. Each valve tag shall be supplied complete with a key ring and chain type fixing with all valve tags securely fixed to the appropriate valve. All plant and equipment shall be complete with a brass or traffolyte label securely fixed to the items describing the system being served, unit model reference, capacity, size or duty, full electrical motor details and manufacturers name. 43
Union Road – K130121
Mechanical Specification
Full details including size, shape and text of all valve tags or other plant and equipment labels shall be forwarded to the Engineer for approval before fixing. Full reference shall be made to all service identification within the operating and maintenance manuals. 2.41
PAINTING
All steel pipework installed internally, once free from rust and scale, shall be painted with two coats of red oxide primer paint. Each coat shall be applied separately with a minimum of 24 hours between the applications of each coat to permit complete drying. All gas piping shall be painted yellow in accordance with BS recommendations. All steel brackets, hangers, supports and support structures, wheresoever situated, shall once free from rust and scale, be painted as above but with an additional coat of black heat resistant paint. Further painting of service shall be carried out in accordance with BS 1710 as required for identification. 2.42
ELECTRICAL CONTINUITY
The whole of the pipework and sheet metal ductwork installations shall be electrically continuous up to and including the plant and equipment. Earth bonding shall be provided across all non-electrical continuity items within the mechanical systems. 2.43
PENETRATION OF FIRE BARRIERS
The Contractor shall ensure within the tender that all parts of the mechanical systems, which penetrate a fire barrier, comply in all respects to the District Surveyors and Local Authority recommendations. 2.44
COMMISSIONING & TESTING GENERAL
The Mechanical Services shall be commissioned and tested to a programme of works and this shall be incorporated in the programme for the contract following approval by the Engineer. The costs for commissioning all systems and for carrying our any specified tests shall be included in the tender sum. Commissioning shall mean the advancement of all the Mechanical Services from the State of Static completion to full working order adjusted to the design requirements. On completion of the Mechanical Services Installation or any section thereof the Contractor will be required to carry out whatever tests are required to demonstrate that the systems fully meet all the design requirements, including the provision of all necessary pressure and temperature test points and instruments. Prior to pressure testing, water systems shall be filled with water and flushed out to remove all foreign matter; chemicals shall be added if necessary to ensure the systems are thoroughly cleaned. Any plant, which may be damaged by the cleaning process, shall be disconnected. Flushing, cleaning and pre-commissioning shall be carried out in accordance with BSRIA Application 44
Union Road – K130121
Mechanical Specification
Guides 1/89 and 8/91. Allowance shall be made to provide all connections and equipment specified in these publications. After pre-commissioning cleaning, all water pipework shall be hydraulically tested to twice the working head or 4 bar whichever is the greater. The pressures are to be increased if required by any public utility. The pressurising equipment shall be disconnected and the pressure maintained for a period of two hours. Ventilation systems shall be cleaned and prepared prior to commissioning in accordance with BSRIA Application Guide. Domestic water services after pre-commissioning cleaning and hydraulic testing shall be sterilised by the application of chlorine. Air and water systems shall be checked and treated to achieve totally hygienic conditions in accordance with Health and Safety Series booklet HS (G) 70. The manufacturer shall commission all plant where the manufacturer offers this service. On completion of any electrical installation, tests shall be carried out as laid down in the 17th Edition of the IEE Wiring Regulations. All testing shall be witnessed by the Engineer and on completion of the test, certificates shall be provided by the Contractor and handed to the Engineer together with two copies of each of the test results upon which the certificates are based. Further copies shall be included in the maintenance/operating instruction manual. Proper records shall be made and these are to be embodied in the maintenance/operating manual. The Contractor is to provide all instruments necessary for testing and commissioning. 2.45
MAINTENANCE OF PLANT DURING COMMISSIONING AND TESTING
The plant shall be maintained in accordance with the manufacturers instructions throughout the commissioning and testing period and until the plant is handed over to the employer. Records of the maintenance procedures and record drawings shall be kept for each Mechanical Services System and these records shall be handed to the Engineer. Properly trained staff shall be made available to maintain the plant and any repairs or replacements that may be necessary shall be carried out before the plant is handed over. 2.46
COMMISSIONING AUTOMATIC CONTROL SYSTEMS
All automatic control systems shall be commissioned in accordance with the CIBSE Code Series C The Commissioning of Automatic Control Systems.
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Union Road – K130121 2.47
Mechanical Specification
BOILER PERFORMANCE TESTS
Boiler systems shall be commissioned in accordance with the CIBSE Commissioning Code Series B Boiler Systems, and in accordance with any specific manufacturer’s requirements. The manufacturers commissioning engineers shall carry out boiler performance tests. 2.48
HEATING SYSTEM PERFORMANCE TESTS
The Heating Systems shall be commissioned in accordance with the CIBSE Commissioning Code Series W -Water Distribution System. 2.49
VENTILATION SYSTEM PERFORMANCE TESTS
All air distribution and extract systems shall be commissioned in accordance with the CIBSE Commissioning Code Series A - Air Distribution System, High and Low Velocity. All ductwork shall be pressure tested in accordance with DW 143. 2.50
HOT AND COLD WATER SERVICES SYSTEM PERFORMANCE TESTS
Hot and cold-water services system performance tests shall be carried out in accordance with the CIBSE Commissioning Code Series W - Water Distribution System. Flow rates given in BS6700 shall be demonstrated under all likely working conditions. Hot water circulation systems shall be balanced to provide water at all draw-offs within the recommended times. Temperatures and draw-off times shall be taken and recorded to demonstrate that the conditions recommended for water hygiene have been achieved. 2.51
ATTENDANCE TO DEFECTS OR FAILURES
During the defects liability period the Installer/Contractor is required to attend to all defects or failures of the engineering systems, plant, equipment, distribution networks, controls, appliances etc. provided and installed under the scope of the contract works. The Client or Supervising Officer will notify the Installer/Contractor of defects and failures as the y occur, which may initially be verbally and later confirmed and recorded in writing.
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Union Road – K130121
Mechanical Specification
The response time for attending to defects and failures will be dependent on the nature of the situation, which are summarised below: Category A – Immediate Response Emergency works where there is a danger to life, limb, property and security. Category B – Maximum 12 Hour Response Heating system failure, hot water system failure, fire alarm system failure, security system failure, door entry system failure, warden call system failure, etc. Category C – Maximum 24 Hour Response Situations that may lead to a Category A or B situation. Category D – Maximum 7 Days Response General defects and repairs. In the event of failure of the Installer/Contractor to respond as required by the above, the Client/Supervising Officer reserves the right to engage others to carry out the work without further reference to the Installer/Contractor and all costs incurred by the Client/Supervising officer shall be recovered from the Installer/Contractor. Such action shall not in any way absolve the Installer/Contractor of his contractual warranties to the Client. APPENDIX A Identification Band Coding:
Service
Drinking Water Boiler Feed Heating L.T.H.W Hot Water Supply Fire Main Natural Gas Drainage Electrical Conduits
Basic Colour (150mm) Name BS Code Ref Green 12 D 45 Green 12 D 45 Green 12 D 45 Green 12 D 45 Green 12 D 45
Colour Code Identification (100mm) Name BS Code Ref Blue 18 B 53 Crimson/White/Crimson 04 D 45/White/04 D 45 Blue/Crimson/Blue 18 B 53/04 D 45/18 B 53 White/Crimson/White White/04 D 45/White Safety Red 04 B 53 Yellow Ochre 08 C 35 Black Orange 06 E 51
47
Basic Colour (250mm) Name BS Code Ref Green 12 D 45 Green 12 D 45 Green 12 D 45 Green 12 D 45 Green 12 D 45
Union Road – K130121
Mechanical Specification
SECTION 3 PARTICULAR CLAUSES
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Union Road – K130121
Mechanical Specification
SECTION 3 PARTICULAR CLAUSES FOR MECHANICAL SERVICES INDEX 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23 3.24 3.25 3.26 3.27 3.28
BRIEF DETAILS OF BUILDING STRUCTURE ................................................................. 50 DESIGN CRITERIA .................................................................................................... 51 RELATED DOCUMENTS.............................................................................................. 55 CONTRACT DRAWINGS ............................................................................................. 55 CONTRACT............................................................................................................... 55 BUILDERS WORK ...................................................................................................... 56 PROGRAMME OF WORKS ........................................................................................... 56 LABOUR RESOURCES ................................................................................................ 56 PERMITS TO WORK .................................................................................................. 56 VISITS TO SITE ........................................................................................................ 56 CONSTRUCTION (DESIGN & MANAGEMENT) REGULATIONS 2007 ................................. 56 WORKING/INSTALLATION DRAWINGS........................................................................ 57 STANDARD OF WORKS.............................................................................................. 57 HOT & COLD WATER INSTALLATION .......................................................................... 58 STOPCOCKS AND DRAIN DOWN VALVES .................................................................... 61 HOT WATER ............................................................................................................. 62 WATER PRESSURE AND WATER STORAGE .................................................................. 63 LANDLORD’S HOT AND COLD WATER SUPPLIES .......................................................... 64 CHLORINATION ........................................................................................................ 64 GAS SERVICES ......................................................................................................... 64 HEATING INSTALLATION .......................................................................................... 66 MITIGATING THE RISK OF CARBON MONOXIDE POISONING FROM GAS FLUES ............. 74 MECHANICAL VENTILATION ...................................................................................... 74 CONTROLS............................................................................................................... 76 INSULATION AND FINISHES ...................................................................................... 76 SUPPORTS ............................................................................................................... 76 HANDOVER .............................................................................................................. 76
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Union Road – K130121 3
Mechanical Specification
SCOPE OF WORKS
The Union Road project is a mixed residential and commercial development consisting of 65 flats 12 Live/Work units and 4 retail. All units are arranged over 4 cores. The tenure mix is 59No Shared Ownership units & 6No Affordable Rent, Blocks A,B & C are entirely Shared Ownership, Block D is split into 8No Shared Ownership and 6No Affordable Rent. All units are to achieve a minimum of code for sustainable homes level 3 and 10% CO2 reductions by onsite low carbon / renewable technologies. A rooftop PV system is to be installed as part of the works, electricity generated by the system will be exported to the grid. This outline brief specification is to be read in conjunction with the current Employers Requirements. The mechanical and public health engineering services are to comply fully with the requirements of the Code for Sustainable Homes and BREEAM. The contractor shall allow for the design, supply, installation, testing and commissioning and setting to work, the complete mechanical and public health engineering services as required by the specification and tender drawings. The scope is for a fully operational installation and therefore services not listed are implied. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 3.01
Incoming Utility Supplies Provision of Above Ground Drainage Services Provision of Domestic Cold Water Services Provision of Domestic Hot Water Services Provision of Low Temperature Hot Water Heating Services Provision of Mechanical Extract Ventilation Systems Provision of Photovoltaic Systems Provision of automatic controls. Provision of controls wiring. Installation of free issue sanitary fitments & brassware. Testing & commissioning. Provision of documentation. Design development and drawing production. BRIEF DETAILS OF BUILDING STRUCTURE
Union Road is a new building consisting of 58 dwellings and 4 commercial spaces This specification is to be read in conjunction with the current Employers Requirements. The 58 No. residential units are to comply fully with the requirement of the Code for Sustainable Homes Level 4 and the 4 No. commercial spaces are to comply with BREEAM very good. Please refer to the Pre-assessments for initial credits for Code & BREEAM compliance. The contractor shall allow for the design, supply, installation, testing and commissioning and setting to work, the complete mechanical engineering services as required by the specification and tender drawings. It is advised that the contractor shall review and fully familiarise themselves with the building, by reviewing the architects and structural engineers drawings, during the tender period.
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Union Road – K130121 3.02
Mechanical Specification
DESIGN CRITERIA
The mechanical services systems are to be based on the following criteria and maintaining the stated environmental conditions. Environmental: External Ambient Temperature Winter
-3C
Internal Ambient Temperature Winter: Apartments Lounge/Dining Room Kitchen Bedrooms Bathrooms Hall/Landing Toilet/Cloakroom
21C 18C 18C 22C 16C 18C
Communal Areas Heating not required. Natural infiltration air change rates Apartments Lounge/Dining Room Kitchen Bedrooms Bathrooms Hall/Landing Toilet/Cloakroom
1.5 2.0 1.0 2.0 1.5 2.0
ACH ACH* ACH ACH* ACH ACH
*Infiltration rates are based on natural ventilation, and should be increased by 50% when mechanical ventilation is provided. Water Services: Mains Cold Water Temperature Hot Water Flow Temperature
10°C 43°C (Blended via TMV mounted as close as possible to the outlet )
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Union Road – K130121
Mechanical Specification
Flow rates to be achieved at points of delivery, which shall be in accordance with Code for Sustainable homes level 3 and BREEAM very good:
Flow restrictors on all basin taps (2.67 litres per minute) Kitchen taps 7 litres per minute flow rate Bath taps 4 litres per minute flow rate Bath 149 litre capacity to overflow 8 litre per minute showers 4/6 litre dual flush WC Standard use washing machines and dishwashers No water softeners
Ventilation Services: Dwelling extract ventilation rates Bathrooms Shower Rooms Kitchens
8 l/s minimum continuous extract rate 8 l/s minimum continuous extract rate 13 l/s minimum continuous extract rate
Margin on Plant & Equipment: Heating Ventilation Domestic Services
20% max 10% max 10% max
Max. Velocities & Pressure Drops etc: Ductwork Heating Pipework HWS Pipework CWS Pipework Electric Motors
1 Pa/m 250 Pa/m 2.5 m/s 2.5 m/s 1450 RPM
Noise Control The mechanical services plant, equipment and distribution shall be designed to achieve sound levels as indicated below when the rooms are decorated and furnished. Lounge/Dining Room Kitchen Bedrooms Commercial Space
NR30 NR40 NR30 NR40
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Union Road – K130121
Mechanical Specification
Above Ground Drainage: In accordance with Building Regulations and IOP Guide. The mechanical services installation shall be designed to comply with the following minimum standards: a) Health and Safety at Work, etc, Act. b) Health and Safety Executive Publications. c) British Standards, relevant European and International Standards. d) The Requirements for Electrical Installations, BS 7671:1992. e) Requirements under the Electricity Acts. f) The Clean Air Act. g) Control of Pollution Act. h) Energy Conservation Act. i) The Building Regulations. j) The Gas Safety Regulations. k) IGE Publications. l) Requirements of local Electricity, Gas and Water Undertakings and Fire Fighting Authorities. m) The CIBSE Guides to Current Practice. n) The IOP Plumbing Services Design Guide. o) COSHH Regulations p) NHBC Requirements q) DOE Circular 86/69 and the Housing Corporation SDS. r) Energy Efficiency Best Practice in Housing “Central Heating System Specification (CHeSS) Year 2005” [Energy Efficiency Best Practice Programme GIL59] s) National Federation of Housing Associations Brief No. 7 “Energy Conservation in Housing” t) Control of Condensation in Dwellings BS 5250. The services general arrangement is indicative only of the type of installation, which shall be provided, and this does not relive the Installer of their design responsibility in providing fully functioning, co-ordinated services that are in compliance with all relevant regulations etc. and obtaining statutory approvals. The Installer shall obtain approval from the Main Contractor and Architect on the location, type and arrangement of all services prior to installation. The installer shall prepare and submit calculations, design drawings and installation drawings for appraisal and comment. A specification detailing all proposed plant, equipment, materials and installation methods shall also be provided.
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Mechanical Specification
The drawings to be submitted shall, at the minimum, comprise the following. All drawings shall be produced in CAD format compatible with AutoCAD 2004: a) General arrangement drawings indicating full services installations and relative plant positioning. (Scale 1:50). b) Plant Room and major plant area design layouts (plans and sections) indicating plant and materials and full installation details. (Scale 1:20 minimum). c) Schematic diagrams indicating component parts of pipework and ductwork systems and all major pipework and duct sizes, control devices and flow rates. d) Ductwork fabrication drawings. e) Drawings and diagrams of major items of plant and equipment with manufacturer’s certified dimensions and data. f) Wiring diagrams and details of any special systems, plant and control panels. g) Any additional drawings or diagrams necessary to ensure the suitability, compatibility and correct location within the system of components selected by him to meet the specified performance of the installation h) Any additional drawings diagrams necessary to show the intended method of coordination with other services, i.e. electrical services, with the structure and other building or architectural features. i) Illustration of maintenance access space, access facilities and panels etc. j) Builders work drawings. k) The calculations to be submitted shall comprise but not be limited to the following:l) Heat loss calculations, including ‘U’ value assessment. m) Heating plant and emitter selection calculations. n) Pipe sizing calculations (all systems). o) HWS Plant. p) CWS Plant. q) Circulation pump sizing calculations. r) Ventilation system calculations, including duct and fan sizing. s) Any other plant sizing and selection data. Prior to the production and submission of the calculations and design and installation working drawings, the Installer shall submit a schedule of calculations and drawings intended to be produced, for the comment from the Employer’s Agent or his representative. All design information shall be provided in a concise manner enabling a full analysis to be carried out by the Employer’s Agent. All calculations, drawings, plant and equipment selections and specification information shall be submitted and commented upon before ordering any plant or materials or carrying out any work. The Installer shall include for all necessary discussions and correspondence with manufacturers and suppliers to ascertain full details of the required method of installation. The Installer shall include for all liaisons necessary with others involved in the production of the proposals and shall fully co-ordinate all aspects of the mechanical services works with all other aspects of the building and its services. The Installer shall be responsible for taking site dimensions and for the accuracy of the information he provides and shall be liable for all costs arising from any errors in such information. At least two weeks shall be allowed for the Employer’s Agent to inspect the submitted documents, 54
Union Road – K130121
Mechanical Specification
from receipt, and also sufficient time shall be allowed to incorporate any comments by the Employer’s Agent and re-submission of the documents prior to commencing any associated work on site. The time for this process shall be included in the programme or works to be agreed. Whenever the Installer submits information to the Employer’s Agent for comment, such comment will be issued in principle only and will not, in any way invalid at the Installers responsibility for ensuring the accuracy and suitability of the information in accordance with requirements specified elsewhere. Note also that comments on the drawings will not relieve the Installer of responsibility for complying with the specification. The Installer shall give due regard to the needs of inspection, efficient maintenance and replacement of the installations, and shall note that ‘comment’ of any bought-in items does not imply any acceptance of responsibility for the satisfactory operation of these items by the Employer’s Agent, and this must always rest with the Installer. The Installer will be required to provide a collateral warranty for the designs to be produced, with the form of collateral warranty to be agreed between the Client and Installer, with the level of professional indemnity cover as stated in the terms of the contract, elsewhere in these employers requirements. It is the responsibility of the Installer to provide all necessary details, calculations and information as to obtain Building Regulations approval for the engineering services installations and equipment. 3.03
RELATED DOCUMENTS
This section specifies the extent of services to be installed by the installer and associated works for this project and must be read in conjunction with Sections 1 & 2 which defines the general requirements and standards of equipment and work required. 3.04
CONTRACT DRAWINGS
This specification shall be read in conjunction with the tender drawings. The Installer shall be responsible for the provision of all fire stopping around pipework sleeves, ductwork etc, which penetrate floors or walls, with the fire compartmentation being determined from the Architects drawings by the Installer. 3.05
CONTRACT
The successful installer shall be a domestic sub-contractor appointed by the main contractor. The installer’s price should reflect all aspects in relation to the contract conditions, and the Installer shall obtain from the main contractor all details of the contract conditions during the tender period. During the tender period any requests for information/clarification relating to the technical aspects of the project MUST be submitted in writing to the Employers Agent and copied to the Engineer, following which a written response will be made by the Engineer. During the course of the contract any requests for information/clarification relating to the technical aspects of the project MUST be submitted on an RFI sheet.
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Union Road – K130121 3.06
Mechanical Specification
BUILDERS WORK
The main contractor shall be responsible for all necessary builderswork and making good associated with the services installation and associated works, with the exception of forming holes up to 50mm diameter, which shall be formed by the installer. The installer shall provide details of all intended builderswork identifying the works involved and the method of working. No builderswork operations are to be undertaken until the Architect has approved the details and verified any structural implications. The Installer shall notify the main contractor at the time of tender submission all necessary builderswork which is required to be provided by the main contractor and is not being provided by the Installer. 3.07
PROGRAMME OF WORKS
Prior to commencing the works on site, the installer shall submit a programme of works for incorporation within the main contractors programme. Site meetings will be held at intervals to ensure the programme is adhered to, and the Installer shall produce a report indicating progress against programme, information required, information received etc., for incorporation within the main contractors report. The installer shall make all due allowance necessary to ensure the programme is adhered to. The Installers programme should clearly indicate all aspects of the works including covering in of services, testing, pressure testing, commissioning, insulation of services, introduction to operation etc. 3.08
LABOUR RESOURCES
The installer shall appoint a competent foreman as site representative who shall remain on site for the duration of the contract and act as principle site contact for the client and engineer in respect of administration. 3.09
PERMITS TO WORK
Not applicable 3.10
VISITS TO SITE
It is essential that the installer will have visited the site before tender submission and has satisfied himself as to the local conditions and accessibility of the site, the full extent and nature of the works, the supply of and conditions affecting labour, carriage, unloading, tolls, scaffolding and ladders and everything else necessary for the execution of the works. No claims on the grounds of lack of knowledge in such respects will be accepted. 3.11
CONSTRUCTION (DESIGN & MANAGEMENT) REGULATIONS 2007
The main contractor as the Principle Contractor as defined with the Construction (Design & Management) Regulations 2007 shall be responsible for the development of the Stage 1 Health & Safety Plan throughout the project. The installer shall provide all necessary method statements, risk assessments and any other details 56
Union Road – K130121
Mechanical Specification
as required for the development of the health & safety file. The installer shall ensure that all items of equipment requiring future inspection and maintenance shall be positioned in accessible locations. Where these locations affect the building fabric or architectural features the installer shall advise the supervising officer within 2 – 3 days. The installer shall include all costs associated with CDM documentation, labour and equipment within the tender. 3.12
WORKING/INSTALLATION DRAWINGS
The installer shall be responsible for the preparation of fully dimensioned installation drawings of a standard and scale suitable for indicating installation details of all works to the satisfaction of the engineer. The installer shall be responsible for co-ordinating the mechanical services to integrate these works within the structure. Working drawings shall include plantrooms, ductwork, external services, distributing services, control wiring diagrams and must be issued for approval by the engineer prior to fabrication or installation. Services in all plantrooms and areas with ventilation plant arrangements shall be detailed to a scale 1:20 with all pipework and fittings etc shown in double line. Detailed drawings of all plant, equipment, vessels and tanks shall be issued for approval together with all associated wiring diagrams. The installer shall allow for a period of 2 weeks for receiving comments from the engineer. The installer shall set out all services and equipment taking into account the positions of all structural, electrical, public health and architectural requirements. The engineer prior to installation by means of fully dimensioned working drawings must approve the setting out intentions of all works. 3.13
STANDARD OF WORKS
The mechanical works shall be carried out in accordance with performance specification and drawings using accepted modern engineering practice and shall comply in every respect with the requirements of all Statutory Bodies and current edition of the Building Regulations and the Supply Authorities. If there are any discrepancies between the specification and Statutory or Supply Authority requirements the Statutory or Supply Authority shall override. The engineer shall be informed at the earliest time of any such discrepancy. Should any British Standards or other standards specified have been superseded the installer shall apply subsequent standards that are current three months prior to the date of return of tenders.
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Mechanical Specification
Materials and fittings for domestic hot and cold water system shall be listed in the current edition of the Water Research Council’s Water Fittings & Materials Directory. 3.14
HOT & COLD WATER INSTALLATION
Installation Generally The Contractor's Proposals are to include for;
Cold water installation
Hot water installation
A cold water storage tank will be provided in the basement area of Block C with integral booster pumps to provide boosted cold water to all the dwellings. The system will be based on the ‘Harton’ Pod 7500-P or similar approved.
Each live-work and commercial unit is to be served direct from the water authority’s main and will not be connected to the communal boosted water supply. All installations are to be in accordance with the Local Water Authority Regulations and Part L1 of the Building Regulations. Local water conditions should be determined and any advice on treatment plant or specification from the local water authority should be incorporated into the scheme as required.Where water conditioners are required to protect the installation these shall be of the electro-magnetic scale reducer type. A signal from the water conditioner will alert the BMS system to a fault condition, highlighting the location of the conditioner.
All components are to be easily accessible for servicing and minor repairs. All associated wiring and associated equipment is to meet the requirements in the electrical section of these Employer’s Requirements. All new appliances, components and fittings shall be of consistent specification throughout the scheme and have low maintenance requirements. Types of pipework generally; Services shall be executed in copper tubing. Yorkshire 'Potable' fittings shall be used for hot and cold water services. Solder shall be lead free. Acid flux will not be permitted. Alternatively, the Employer may accept the use of a fully tested and certified plastic pipe system (but not a micro-bore system). No pumps are to be provided on the hot or cold water supplies within individual dwellings except circulation pumps to hot water service to avoid dead legs where these cannot be designed out. Water storage systems must be designed to avoid propagation of Legionnaire’s disease. Flow restrictors to be fitted on taps in order to reduce water consumption in line with code for sustainable homes level 3.
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Mechanical Specification
Incoming Water Supply Pipework Water supplies and rising mains shall be executed in pipework in accordance with the requirements of the Local Water Authority and terminating with a brass stop valve in an accessible position. The pipework shall be laid on a bed of, and surrounded with free draining coarse sand to give at least 100mm cover all round. Backfilling shall then commence with a 350mm depth of selected fine material free from all builders’ rubble, flints, stones, tree roots, etc; carefully hand packed. Material shall not be dropped into the trench from a great height. Backfilling shall continue in layers not exceeding 350mm in depth, well rammed and consolidated. Mechanical ramming shall not be permitted within 915mm of the top of the pipe. Copper pipework for external underground installations up to and including 54mm shall be manufactured in accordance with the provisions of EN1057 Table Y, Kite Marked and double wrapped in acid resisting “Denso” tape. Up To and Including 63mm Nominal Bore If the soil investigation report is favourable, the external underground cold water mains distribution shall be carried out in polythene pipework in accordance with BS6572 MDPE unless shown otherwise on the drawings. Joints shall be made with compression fittings as Yorkshire Imperial Kutherlite 1700 with lines, or equal and approved. Underground polythene pipework shall be carefully laid in accordance with Local Water Authority Regulations. If the ground conditions are found to be unsuitable for MDPE pipework, a suitable barrier pipe is to be installed. Above 63mmNominal Bore If the soil investigation report is favourable, the external underground, buried cold water main pipework shall be in Blue MDPE as shown otherwise on the drawings. Fittings shall be relevant British Standards where applicable. Flanged or electro fusion joints shall be used in preference to other forms of joint. All installation and jointing shall be in accordance with the manufacturers requirements and recommendations, and those of the Local Water Authority. If the ground conditions are found to be unsuitable for MDPE pipework, a suitable barrier pipe is to be installed. The pipework shall be laid on a bed of, and surrounded with free draining coarse sand to give at least a 100mm cover all round. Backfilling shall then commence with 350mm depth of selected fine material free from all builders’ rubble, flints, stones, tree roots, etc, carefully hand packed. Material shall not be dropped in to the trench from a great height. The underground pipework is to be disinfected in accordance with Water Supply (water fittings) Regulations 1999 (SI 1999, 1148). Water Meters Each dwelling must be provided with a separate metered water supply with an accessible stopcock within the dwelling at point of entry. Underground meters are preferable for the live-work and commercial units to allow the meters to be read externally.
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Mechanical Specification
The water meters are to be provided by the relevant water company responsible for undertaking the direct billing for each dwelling. The Employer will require individual meters to each flat even if booster / tank sets are installed. The Employer will not accept check meters. The residents are to be billed directly by the Water Authority (meters to be located in risers). There will be an individual metered supply provided for the landlord in each block. The Employer will not accept check meters. The landlord is to be billed directly by the Water Authority (meters to be located in risers). Live-work and Commercial Units The water supply will terminate within the unit and will be capped off for future fit out. 3.14
DESIGN OF INTERNAL PIPEWORK INSTALLATION
The run of pipework shall be arranged in a neat and workmanlike manner and shall be agreed with the Employer’s Agent. All pipework and associated casings to be invisible from outside, not mounted externally on buildings. They should be internal to the home and / or underground. Pipework shall be concealed as far as possible. All concealed pipes adjacent to external walls and all pipes within ducts shall be lagged with sectional foam or other equal lagging securely bound on. Minimise exposed pipe runs wherever possible and maximise the use of voids and stores for pipe runs. Only brass capillary fittings are to be used in enclosed spaces i.e. pipe casings, cupboards etc Buried pipework is not permitted. Pipes shall be concealed wherever possible; no pipework shall be run in screeds. In exceptional circumstances, short runs within solid floors will be acceptable, but all such runs shall be accommodated within and including proprietary service ducts fixed in accordance with the manufacturer's instructions and incorporating removable access covers. Timber ducts are not acceptable. Access must be provided to all internal service ducts with panels fixed by means of cups and screws to facilitate easy access for maintenance purposes to all vulnerable connections and joints. Pipes embedded in walls or passing through masonry, whether sleeved or not, must be protected against corrosion by PVC or other approved sheath. Pipes passing through kitchen cupboards are to be lagged to prevent condensation. Pipes adjacent to external walls (whether in duct or not) or any unheated area must be insulated with pre-formed foam insulation. All pipes in floor spaces in ducts and any cold water exposed pipework susceptible to condensation shall be lagged with sectional foam or other equal lagging securely bound on. Hot and cold water pipes shall be spaced so as to avoid heat transference.
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Mechanical Specification
No pipework shall be installed closer than 150mm from any electrical cable or conduit except at crossover points. Wherever possible, crossover points are to be avoided. Vertical pipes shall drop parallel to walls, partitions and / or buildings, structure and flows and returns shall run parallel to each other. Horizontal pipes are to be graded to clear air at vent points or radiators and to drain at low points. Where pipes run parallel to one another, a minimum distance of 25mm will be allowed between the respective services or in the case of insulated pipes, the face of the insulation. All pipework must be fixed and hydraulically tested before the application of paint or thermal insulation. All pipe clips and brackets shall be screwed. The Contractor is required to provide independent / metered water mains to each of the individual units / landlord areas from the common rising main (meters to be located in risers) of sufficient size, capacity and pressure. Include for all necessary liaison and costs for the installation of services in association with the Water Authority/Service Company including all infrastructure and connection charges. Provide water meters approved by the Authority/Service Company clearly labelled with unit postal addresses/Landlords. Copper pipework shall comply with EN 1057 Part 1 Table X (half hard condition) and bear Kite Mark, associated compression or capillary joints and fittings should comply with EN1254 Part 2 and amendments. Copper capillary fittings shall have integral solder ring and bear the Kite Mark. All pipework shall be fixed with clips and not more than 1.5 metre centres with pipe clips and brackets being screwed. Pipes passing through screeds shall be sleeved and wrapped in building paper. Fire stopping shall be provided as necessary. All fittings shall be non-dezincable manipulative compression type to EN1254 as “Kutherlite” manufactured by Yorkshire Imperial Metals Ltd equal and approved. All pipe work insulation shall comply with Building Regulations and shall be to a minimum standard as follows: Mains water in risers - 30mm mineral wool with foil face finish. Mains cold water from the risers to the dwellings and within dwellings – 19mm phenolic Hot water flow in dwellings – 13mm phenolic All pipework to be insulated and labelled throughout. External Watering Point – External Landscaped Area Provide 1 No. metered supply in each block to serve the Landlord’s external watering points, cleaners sink (where installed) and bin stores. The location of the watering points are to be agreed with the Employer’s Agent terminating with a 22mm hydrant type valve with a loose key and standpipe set in a pre-cast concrete hydrant box, all in accordance with the installation requirements of the Local Water Authority. 3.16
STOPCOCKS AND DRAIN DOWN VALVES
Stopcocks at point of entry to the dwellings must be easily accessible and clearly labelled. Care should be taken with regard to the positioning of stopcocks. It is necessary to be able to isolate every stopcock from inside the home. All stopcocks, valves etc shall be labelled with trafolyte labels. The minimum requirement for control valves in all dwellings is as follows: -
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Mechanical Specification
Mains water point entry into the building At point of connection to storage tank On boosted water supply On cold water feed to cylinder On branch to WC Cistern On all hot and cold water services To all sanitary fittings. Drain off valves are to be positioned so that the systems can be properly drained out at all low points in the installation and at the point of entry of the cold water service to the cylinder. They shall be located so as to be readily accessible. Provide isolation valves to all appliances and equipment for maintenance purposes. All control, isolating, non-return and stop valves and all drain-off points shall be easily accessible and clearly labelled with engraved ‘Traffolite’ labels fixed with chains. Provide hot and cold supplies and control valves "ball-o-valve" connections for washing machine in every dwelling. A full schedule must be provided of the position of all stopcocks and drain-offs. 3.17
HOT WATER
Hot water to each flat shall be provided by the use of a hydraulic interface unit, serving a hot water storage cylinder. The HIU and water cylinder will be a packaged unit, including expansion vessel, pumps, heat meter, valves, controls, immersion heater etc. The cupboard containing the hydraulic interface unit must be of adequate size to allow replacement without alteration of the cupboard. Where units are situated in a cupboard there shall be minimum headroom above the unit in line with the manufacturers requirements. Access to the units must be from a door not a screwed panel and pipework shall not impede the removal of the unit. Hot water storage cylinders shall be adequate to meet peak demand from the occupants with quick recovery and be provided with an immersion heater, which shall have top entry. Hot water storage temperature shall be a minimum of 60C. Cylinder to have factory applied CFC and HCFCfree insulation. Provide immersion heaters with dual element which shall be thermostatically controlled. A 3 Kilowatt twin immersion heater is required to the hot water cylinder and shall be a thermostatically controlled Titanium sheathed type set at 60ºC and shall be provided with an engraved switch with neon indicated located outside, but in proximity to the airing cupboard at a height of 1100mm from finished floor level. Problems can occur with pitting corrosion to copper cylinders due to high organic purity combined with fairly high natural hardness in certain waters. Where this condition does exist, the copper cylinders are fitted with aluminium protector. A check should be made with the Water Company to determine whether they recommend the use of aluminium protector rods. Where aluminium protector rods are required and fitted and in extremely hard water areas titanium sheathed immersion heaters should be fitted. 62
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Mechanical Specification
Drain off valves are to be positioned so that the systems can be properly drained out, at all low points in the installation. All new hot and cold water outlets throughout the developments are to be fitted with flow regulators to code for sustainable homes level as outlined within the mains cold water section of this specification. All baths within the dwelling are to be fitted with thermostatic blending valves to limit the maximum temperature of the hot outlet in line with the latest building regulations. All fittings shall be non-dezincable manipulative compression type to EN1254 as “Kutherlite” manufactured by Yorkshire Imperial Metals Ltd equal and approved. All isolating valves, stop valves and water meters shall be provided with “engraved Traffolite” labels firmly attached. The water meter label shall be engraved with the postal address of the property and attached with a rot-proof tag. The individual mains to be traced before label fitted. 3.18
WATER PRESSURE AND WATER STORAGE
The contractor is to check the water pressure available from mains and ensure all installations comply with Water Company requirements and provide adequate water pressure for all domestic needs and appliances. The Contractor shall provide and install a package of measures in each dwelling to achieve a water consumption rate per person per day calculated using the appropriate Code for Sustainable Homes formulae to achieve the Code for Sustainable Homes rating as specified elsewhere in this document and demonstrate same to the Employer for each dwelling type. The Contractor shall undertake a mains supply pressure monitoring test over at least a 48 hour period. Provide to the Employer certified evidence of the cyclical water pressures available and a report demonstrating the pressures and flow rates available for each dwelling in the scheme. Pay all costs and charges in connection therewith. Water pressure to be a minimum of 1 bar of water pressure to all taps and shower heads (including those to baths) including when shower head is held at 1.8M above floor level. All taps shall be capable of withstanding mains or boosted pressures. For the flats, twin booster pumps shall be provided and, if possible, the Contractor shall arrange for these to be ‘Adopted’ by the local Water Company. The location of the pumping equipment and meters are as shown on the drawings and irrespective of whether or not the pumping equipment is ‘Adopted’, the local Water Company’s meters shall be installed (not check meters), where possible, to ensure utility bills can be issued direct to occupiers in the usual way. No tanks or cylinders shall be placed directly on floors but must be provided with supports to give circulation air space beneath. Any lagging / insulation must be CFC and HCFC-free and installed in accordance with Part L of the Building Regulations. Boosted cold water packaged units will be provided to serve all the blocks and will consist of GRP insulated water tanks above a twin pump booster set, which will boost the pressure of the cold water to suit the pressure requirements in the top floor flats. The booster sets will serve risers within each block complete with isolating valves, pressure reducing valves, etc. All pumps will be inverter driven.
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Mechanical Specification
The blocks will be served from a communal tank and booster set in the Block C with underground pipework serving the internal risers. At this stage the packaged underground booster set is based on the Harton Pod 7500. If any of the packaged boosted cold water units are in fault mode, a signal is to be passed to the BMS system highlighting the fault and the particular unit. An automatic air admittance valve will be installed at the top of each boosted cold water riser. 3.19
LANDLORD’S HOT AND COLD WATER SUPPLIES
Provide 1 No. metered supply in each block to serve the Landlord’s external watering points, cleaners sink (where installed) and bin stores etc. Landlord’s supplies will also be required for the plant room. The location of the watering points are to be agreed with the Employer’s Agent terminating with a tamper proof hose bib tap with Category 3 protection as supplied by Arrow Valves model SPED or similar approved, all in accordance with the installation requirements of the local water authority. At this stage the number of watering points is to be based on one for every 20m² of planting beds. The communal bin stores are to be fitted with an external standpipe assembly terminating with a tamper proof hose bib tap with Category 3 protection as supplied by Arrow Valves model SPED or similar approved, all in accordance with the installation requirements of the Local Water Authority. The external standpipes in the bin stores are to be provided with a drainage gulley. Electric water heaters are to be provided to serve each cleaner’s cupboards. Facility: For the cleaners sink provide and install an above sink storage type heater. Cold water supplies will also be required for the landlord’s sinks, whb’s and WC’s. 3.20
CHLORINATION
On completion the entire domestic services installation shall be sterilised in accordance with BS 6700/HSG70. The installer shall allow for all chemical injection points or additional facilities required to enable chlorination. The installer shall allow for taking 10 No. water samples on completion of the chlorination for submission for laboratory testing to determine bacteriological purity, with these samples taken from locations as directed by the supervising officer. The engineer shall be given at least 48 hours notice prior to chlorination procedures. If the chlorination procedure is carried out without prior notice being given to the Engineer, the process may have to be repeated at no cost to the contract at the discretion of the Engineer. 3.21
GAS SERVICES
Supply To Central Plant Room A new gas supply will be provided to serve the communal plant room in Block C. The gas authority will provide a new gas main to an above ground entry terminated with a line isolator. The excavation and back fill is to be carried out by the main contractor. The mechanical contractor is to connect to the line isolator and extend the pipework to the gas meter located in the new plant room utilising carbon steel pipework to BS1387. The gas meter will be provided and installed by the chosen shipper, which will serve the residential communal natural gas fired boilers. 64
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Supply To Dwellings The individual flats will not be fitted with gas. Meters For the plant room a bulk gas meter is to be provided in an appropriate location acceptable to the utility authority and with all associated connections and health and safety requirements. The meter must be a pulsed meter with the facility of being read remotely from site via the site wide Mbus network to be installed. If it is not permitted by the gas authority to install the gas meter within the plant room, the gas meter box shall be located at ground floor level in appropriately designed meter housing as required by the utility company. Where gas meter boxes are located in external landlord areas, they shall be appropriated fenced off from pedestrian routes and installed as required by the utility company. An emergency gas valve and gas system schematic diagram shall be located within the plant room. Gas Services The gas service pipes to and from the meter shall be run in accordance with the gas shippers requirements. A PVC sleeve shall be provided around the gas supply pipes where they pass through masonry and shall protrude externally between 30 – 50mm. Gas Safety Have regard to the Gas Safety (Installation and Use) Regulations 1984. Gas Safe Registration All Specialist Contractors employed by the Main Contractor to undertake the installation, commission and testing o the installation shall be quality approved and Registered engineers in accordance with the Gas Safe Registration Scheme. Pipework Communal Gas Supply External gas services above ground shall be run in heavy quality steel to BS1387:1985 and amendments with screwed fittings and above. All external gas piping laid in earth shall be carried out in yellow polythene tube to BS6572 with electro fusion welded fittings and laid to a minimum depth of 600mm. Internal carcassing shall be provided in “heavy grade” steel barrel pipe to serve boiler and cooker positions (if applicable). In accordance with BS1387:1985 and amendments. All pipework shall be screwed.Fittings shall be of the best quality malleable iron and flat seated unions shall be manufactured in accordance with the provisions of BS EN10242:1995 (ISO459) and amendments. All bends and tees shall be square pattern. Bushed fittings will not be permitted. All gas pipework should be clearly marked and labelled using metal ring tags. Screwed joints shall be made with Hawk White jointing paste.
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Mechanical Specification
From the service entry point into the building a gas supply shall be run to the boiler. At the entry point into the building provide an isolator to the gas supply. Gas fired heating systems shall be installed by a Gas Safe registered contractor and a certificate confirming compliance with all the relevant regulations will be required for each dwelling at handover. Gas supply to each appliance should be adequately sized to deliver correct supply pressure and should be no greater than 1mb across the system from the meter. No gas pipework shall be laid in floor screeds. Smoke tests shall be carried out to all gas appliances and flues by a Gas Safety Scheme registered installer prior to handover to establish compliance with gas regulations and ensure safety. 3.22
HEATING INSTALLATION
District Heating to Flats and Live Work Units The works shall comprise the design, supply, delivery, survey, installation, builders work, commissioning and setting to work all of the necessary forming parts of the heating system, including works testing, off-loading, erection/installation, demonstration, making good of defects during the Defects Liability Period, provision of all as installed documentation, O&M Manuals and test certificates to form the complete and fit for purpose Low Temperature Hot Water Heating Installations. A central boiler plant will be located within the plant room in block C and will provide low temperature hot water for the space heating and hot water requirements for blocks A-D, the commercial units and Live Work Units. The pipework runs from the plant room underground to serve all other blocks on the estate. The Commercial units B101-B104 will not be connected to district heating system but will be supplied with capped off connections within the units for future connection to the site wide system. The pipe system shall be complete with all necessary fittings as appropriate. Joints within all carrier pipes shall be by means of compression joint system. Joints should be kept to an absolute minimum and shall only be made where they can be accessed via inspection pits in appropriate locations for ease of future maintenance. Additional Inspection pits are to be constructed to house commissioning and isolation valves and outside each block where the pipework will be trenched to serve the risers within the building. Pipework terminations at each block shall generally use pre-fabricated lead in bends to terminate into the isolating valves. In certain cases the natural bending radius of the pipe could be used, however provisions should be made in the groundwork and structure to allow for this. Proprietary fittings shall be used to change from plastic to steel and terminate as indicated above. Underground heating pipework shall be run at minimum depth of 600mm and where there are clashes with other services, the mains shall run underneath the service with which they clash. The complete pipe systems shall be installed strictly in accordance with the manufacturer’s recommendations.
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Comply with all legislative requirements associated with the installation. For the maximum pressure drop in the system to not exceed the requirements of IGE/UPE/2 Be noise and vibration free and securely fixed to the building fabric. Clearly identified as to which purpose the installation serves. NHHA require early agreement on the maintenance arrangements and associated costs, including on-going sink funds, for the energy centre to ensure required heating and hot water billing tariff setting with NHHA’s preferred metering and billing company. This is to be provided at least 6 months prior to handover of NHHA dwellings. All control, isolating, non-return and stop valves and all drain off points (one must be located in an accessible location at the lowest point of the heating system) shall be easily accessible and clearly labelled with engraved ‘Traffolite’ labels fixed with chains Main Plant The Boilers in the plant room shall have spark ignition and be of the ultra-low Nox (< 25ppm 02 = 0%, dry) condensing type. Boiler installation will comprise of high efficiency condensing gas fired boilers, pressurisation unit and expansion vessel/s along with all necessary variable speed pumps and fitting to provide a fully working installation. A boiler flue will pick up the combusted gas and run up to discharge to atmosphere 3 metres above roof level. Each boiler shall be provided with a spring-loaded safety relief valve set to operate at a pressure of 0.7 bar above the operating pressure of the heating system. The Installer shall liaise with the boiler and pressurisation unit supplier to determine safety valve operating pressures prior to order. The manufacturer shall carry out commissioning of the boilers, with the installation complying strictly in accordance with the manufacturer’s recommendations. The primary circuit within the boiler plant room will be carbon steel. The pumps shall be twin head, variable speed. From the plant room, heating water will then be pumped to serve all the blocks. All heating pipe work shall be cross-linked polyethylene and insulated throughout. Each circuit shall distribute from the plant room to the individual blocks below ground. Heating pipework shall rise from below ground within the base of the riser and convert back to steel where it shall rise up the building. Steel heating pipework shall distribute from the risers to the dwellings within the ceiling voids within the communal areas. All heating pipework shall be fitted with flexible connections as it exits the top of risers. The primary heating circuit shall incorporate an air/dirt separator and a chemical dosing pot, with the system being chemically cleaned and dosed on completion. Drain valves shall be provided at all low points to enable the entire system to be drained. Isolating valves shall be provided at each item of equipment, plant and at main branches on the distribution circuits. Fixed orifice plates and regulating valves shall be provided at main branches on the distribution circuits to enable the entire system to be balanced, and at each manifold position. Automatic air vents with discharge pipes shall be provided at all high points. Boiler Flue Installation Prior to fabrication the flue specialist shall attend site to obtain dimensions with the boiler plant in67
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situ and produce a working drawing of the flue installation. All exposed elements of the flue system shall be finished to a RAL colour to be selected by the Architect. The flue shall be of the conventional type without fan assistance. The flue system shall be installed strictly in accordance with the manufacturer’s recommendations. Underground Pipework The heating mains shall be flexible fully bonded pre-insulated pipe system. The coextruded fully bonded layers should consist of a carrier pipe made of high pressure cross linked polyethylene with an oxygen-barrier layer and an insulating foam layer and a PE-LD corrugated outer jacket. Carrier pipe Basic pipe: Basic material: high-density polyethylene (PE-HD) Peroxidecured PE-Xa; colour: natural Oxygen barrier layer: Ethylene / vinyl alcohol (EVOH), heat-stabilised, colour: natural Bonding agent: PE-modified, heat-stabilised, Requirements: to DIN 16892 / DIN 16893 and E DIN EN 12318-2; Oxygen impermeability: To DIN 4729; at 40°C, oxygen permeability (in relation to the inside pipe volume) of 0.10g/(m3 x d), as per DIN 4726 Pipe series to DIN 16893: Series 5: SDR 11 for heating (with oxygen barrier) Series 3.2: SDR 7.4 for sanitary (without oxygen barrier) Long-term behavior: See below Characteristics: Insensitive to aggressive water, low pressure losses, excellent chemical and mechanical resistance. Insulation Material: CFC-free, cyclopentane-blown polyurethanfoam (PUR), with l50-value 0.0255 W/mK. Casing Material: Linear polyethylene with low density (LLD-PE) seamless extruded Task: Protection against mechanical influence and moisture. For continuous temperatures and assuming a safety factor of 1.25 in accordance with DIN 16892/93, the following continuous operation temperature and pressure limits should apply to the pipes (application: water, safety factor: 1.25): 65 70 75 80 85 90
°C / °C / °C / °C / °C / °C /
6 bar 6 bar 6 bar 6 bar 6 bar 6 bar
/ / / / / /
100 years 80 years 75 years 55 years 45 years 25 years
Design Pressure Drop – less than 300 Pa/m Htg Water Temp 80OC flow / 60OC return. Ventilation Ventilation of plant rooms shall be designed to prevent excess build-up of heat and preclude the possibility of build-up of dangerous natural gas, oil fumes or exhaust gases. The contractor shall comply with the manufacturers recommendations for ventilation of the plant room where the equipment is installed.
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The contractor must provide an adequate acoustic attenuation to ensure the surrounding areas do not exceed a Noise Rating (NR) of 30. Commissioning The boilers and integral controls are to be commissioned by a specialist commissioning engineer working on behalf of the manufacturer. Gas installation must be tested and commissioned by competent persons in accordance with the Gas Safety Regulations. Electrical systems including earthing should be tested and commissioned in accordance with BS 7671 and the relevant grid connection standard. A completion certificate listing all commissioning activity and associated test results shall be provided. Heating Water Treatment On completion of all works, the heating systems shall be chemically cleaned and dosed with corrosion inhibitor, chemicals being Canning D DE-rust E or Betz Dearborn 5236 cleaner and Betz Dearborn 5263 corrosion inhibitor, or equal approved. Prior to the introduction of the cleaning agents to the system a hydraulic flush shall be carried out to remove any large particles retained in the system. The engineer shall be given at least 48 hours notice prior to cleaning and doing procedures. If the cleaning and dosing procedure is carried out without prior notice being given to the Engineer, the process may have to be repeated at no cost to the contract at the discretion of the Engineer Automatic Controls Provide and install, test, commission and demonstrate the automatic Building Management System (BMS) to control the heating system and provide alarms for the district heating and booster pump systems. General and Item Alarms These shall be reported to the alarm history buffer, which shall store the last twenty alarm state changes. These alarm messages, subject to requirement shall be capable of transmission to the Central Supervisory Computer. All general/item alarm conditions shall include a 10 minutes delay. Typical general/item alarms are:
Water or air temperatures outside set limits Sensor, or sensor wiring malfunction Change of state of volt and current free contacts, to include control status of Controller, i.e. "Hand/Off".
Critical Alarms These special alarms shall be set up in the strategy and shall transmit a defined text Alarm message to the BMS. Critical Alarms are defined as those which report failure of plant that would directly affect the environmental services an ultimately affect the operational use of the premises and or create a Health and Safety hazard. 69
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All critical alarm conditions shall include 10 minutes delay. Typical critical alarms are:
Boiler lockout High-pressure alarm (Pressurisation Unit). Gas supply failure. Booster pump fault
The Controller shall subject to defined logging requirements be capable of monitored the following information:
Sensed water, air, and boiler flue gas temperature. Hours run of controlled plant.
Telephone Communication A standard telephone socket shall be fitted within 1 metre of the Controller for connection to the modem unit supplied by the Contractor. The gas-fired boilers are to be controlled by an optimiser programme in sequence in order to maintain a constant temperature on the boiler return. The condition of the boilers will be monitored by the BMS system, which shall provide indication of a fault on any of the boilers etc and raise an alarm. Individual boiler fault indication lamps shall be provided on the facia of the control panel. Once a boiler has been enabled by the control system the control of the individual boilers is to be carried out by the integral control package on each boiler. Above each boiler will be located an electro thermal link. In conjunction with an emergency stop button located adjacent to the plant room entrance and a gas safety solenoid valve, these devices will provide emergency shutdown on the gas supply should a fault occur with any of the three items of plant or if the emergency stop button is pressed. The emergency stop button is to be a twist to reset type and the gas solenoid valve shall be of the automatic reset type. The primary pump is to be switched via a HAND/OFF/AUTO selector switch whenever the lead boiler is enabled. The pump shall continue to run for a period of time to allow the heat to be dissipated from the boiler circuit whenever the boilers are switched off. A flow switch mounted in the return after the pump will monitor the pump flow condition. Should no flow be proven, the system shall shut down boilers, if running, and raise an alarm. The variable speed heating pumps, which consist of a duty standby arrangement shall be enabled by a HAND/OFF/AUTO selector switch and the BMS system on an optimum start basis, in conjunction with the boilers. The duty pump will be determined by the Controller and will be changed over in the event of no flow being proved by the flow switch mounted after the pump set. The duty pump will be changed on a 100-hour basis. The variable pump speed will be governed by the pressure sensor sensing the pressure differential due to the consumer interface units in the dwellings not requiring any heating or hot water. Where software switching is incorporated e.g. sequence switching of multiple boiler plant, sufficient hard wired controls shall be incorporated to allow the plant to be operated by hand in the event of micro-processor failure. Switching shall be provided at the control panels to facilitate automatic programme and manual override of plant and to allow individual items to be control-circuit isolated. In the case of automatic programme override, the appropriate "failure to start" contact shall be short-circuited to prevent a false alarm. Duty/Standby selection shall also be facilitated at the control panels.
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All controls necessary to protect personnel and plant from malfunction liable to cause injury or damage respectively shall require manual re-setting subsequent to triggering of the function. This shall be affected at the operator’s terminal. Outside frost protection shall be provided to override time switches and run the associated boiler pumps under frost conditions. Boiler and pumps will operate if the water temperature falls below 5ºC as sensed by the immersion sensors. Access to the controlled set points and plant status is to be provided through the installation of a network display panel to be mounted on the panel facia. Water Conditioner: Volt free contacts from the control box controlling the unit will provide the outstation with the following information: Power failed A 24-hour, 7-day time shall enable the water conditioner unit control box to operate via the outstation. Booster Set: Volt free contacts from the intelligent controllers controlling the Booster Units will provide the outstation with the following information: Pump running/tripped Low water level Low system pressure Power failed A 24-hour, 7-day time shall enable the booster unit controller to operate via the outstation. 12.18 Heating Within Dwellings The heating system within the building is to maintain comfortable temperatures for the residents. In addition to this the heating system will be designed with the following in mind; Zoned to meet resilience and ease of maintenance Energy efficiency Provide users with control of their environment, increasing thermal comfort Thermal modelling of the entire heating system will be required to ensure there are minimal heat losses over the distribution network and that overheating does not occur. Where non-compliance is identified the design must be modified to overcome the anticipated problems and remodelled accordingly to prove compliance. The Contractor shall install a heating system, which shall comply with the achievement of the Code for Sustainable Homes Level 3 rating as set out earlier in the documentation and where applicable either/or the London Plan and local planning requirements. The installations shall be designed to achieve not less than the internal air temperatures with ventilation rates given in the following table when the external temperature is -3 degrees C: Room
Temperature
Living room
21oC
Dining room/area
21oC
Home office room/area
21oC
Kitchen
18oC 71
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Mechanical Specification Hall and landing
16oC
Bedroom
18oC
Bathroom/Shower room
22oC
Toilet/Cloakroom
18oC
The installation in the dwellings shall be designed with minimum two heating zones, one ‘living’ zone controlled by a wall mounted thermostat located 1050 mm above finished floor level in a position (to avoid direct heat or draughts) agreed with the Employer and the other zones with thermostatic radiator valves All radiators shall be located with consideration for furniture layouts, door swings, the achievement of clear opening door widths and electrical and communication outlets and equipment points and electric towel rails (where fitted). All pipework to be concealed. All heating pipe work shall be cross-linked polyethylene served and insulated throughout. Each circuit shall be distributed from a manifold via ceiling/floor voids and drop in concealed locations to serve individual radiators. Exposed connections onto radiators shall be in copper table X; microbore pipework shall not be permitted. The heating system should be controlled by a simple electromechanical programmer, located in the boiler cupboard, giving the capability of two on/off settings in a 24 hour period and an independent hot water control on systems where a hot water cylinder is installed. The heating temperature control is to be zoned to allow separate control of each floor and to meet Building Regulations using room thermostats. Thermostats including accelerator heating element (position to be agreed with Employer’s Agent) and time switches shall be fitted at heights between 900mm – 1200mm above floor level. “Randall type R504D,” “Satchwell TLX2356” or other equal approved room thermostats are acceptable. A boiler interlock will be installed to switch off the boiler when the heat requirement, as determined by the room-stat, is satisfied. On systems where a hot water cylinder is installed, an electric cylinder stat should be fitted. A boiler interlock should also operate for the hot water only programme mode. The heating system should be controlled by a simple 7 day 2 channel programmer, located in the kitchen, giving the capability of two on/off settings in a 24 hour period and an independent hot water control for hot water cylinders. The heating temperature control is to be zoned for each floor and is to meet Building Regulations using a room thermostat, which shall be located within Noisy items of equipment, such as pumps, should not be installed next to bedrooms nor be fixed to plasterboard partitions. Radiators Generally Pre-finished enamelled pressed steel Kite-marked roll top pattern radiators should be provided to all rooms including the hall/staircase area. Radiators shall be firmly fixed to the walls in accordance with the manufacturer’s recommendations (note cavity/toggle fixings may not be used). The use of kick-space heaters is not permitted.
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All radiators should be fitted with Drayton or similar approved thermostatic valves. Except those located nearest the thermostat, which shall typically be the hall radiator. Wheel head valves shall be used connected to the top of the radiator. The sizing of radiators shall take account of the requirements of European Standard BSEN442. All radiators shall be finished to RAL 9010 semi-gloss warm white. The installer shall suitably protect radiators for the duration of the contract. Any repairs to damage of the paint finish of casings will not be accepted and replacement casings shall be provided. The installer shall suitably protect radiators for the duration of the contract. Any repairs to damage of the paint finish of casings will not be accepted and replacement casings shall be provided. Radiators shall generally be located below windows, subject to furniture layouts being acceptable, and shall be allocated to provide even heat distribution within the heated rooms. Radiators shall not be located behind doors, unless the general arrangement of the rooms provides no alternative locations, and if this is the case the Installer shall notify the architect of the proposed locations and projection of the radiator from the wall to the face of the radiator. Radiators shall be selected and installed with the minimum clearance of 50mm from top of radiator to underside of window board. Thermostatic radiator valve heads shall be handed to ensure effective temperature sensing of the environment, and shall be positioned to enable accessible operation by the occupants. Roll top pattern radiators should be provided to all rooms including the hall/staircase area and bathroom and shall be of sufficient sizes to achieve the specified air temperatures. The positions should generally be under windows but where this is not possible, alternative positions should be carefully worked out at design stage for greatest efficiency, to allow flexibility for furniture layouts and optimum comfort conditions. Heated chrome finished towel rails (no radiator) are to be installed to all shared ownership units Addendum for Shared Ownership Units Bathrooms/Ensuites to be fitted with a dual fuel towel rail. Heat Interface Units Hot water shall be provided to the Apartments through the heat exchanger with primary water from the communal boilers. Hot water shall be delivered instantaneously on demand from the plate heat exchanger within the dwelling. The hydraulic interface unit shall provide an interface between the central boiler plant and the individual dwellings. The unit will enable residents to have individual control of their heating and hot water requirements via the control valves located within the unit. Flow rates are automatically adjusted via a differential pressure controller, which must ensure constant delivery performance to each dwelling. Each Hydraulic interface unit shall be fitted with a heat meter, capable of remote logging via a MBus, or similar data network to allow individual billing. The HIU shall be a packaged unit including the HIU, water cylinder, expansion vessel, pump, controls etc as provided by Harton or similar approved The HIU shall have a remote pulse meter for each dwelling capable of producing a spread sheet reading for each apartment with digital display for the benefit of the resident. An interlock should be installed to switch off the HIU when the heat requirement, as determined by the room-stat, is satisfied. On systems where a hot water cylinder is installed, an electric cylinder 73
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stat should be fitted. A boiler interlock should also operate for the hot water only programme mode. The programmer shall be a simple to operate, 7 day programmer providing up to two periods of “on” and “off” per day giving independent control of space and water heating. Clear user instructions to be provided. 3.23 MITIGATING THE RISK OF CARBON MONOXIDE POISONING FROM GAS FLUES Where flues are encased in pipe ducts or in ceiling voids, removable ceiling/duct panels for inspection shall be provided for the full length of the flue/pipe duct. The commissioning of the gas boilers/central heating systems to be carried out within 15 days of handover, after the building work has been completed in that unit (this will hopefully prevent damage to flues after safety checks have been carried out). Gas Safe Certificates and CP4s must be issued in the Associations name as owner/landlord of the scheme and must be dated no earlier than 15 days prior to handover. If CP4s are dated earlier than 15 days before handover the Contractor will be required to retest the installation and supply new certificates at their own cost. The Contractor and his M&E Subcontractor will be required to confirm that they have fully complying with the recommendations contained in Gas Safe Technical Bulletin 200, Revised 11th June 2008. 3.24
MECHANICAL VENTILATION
Dwellings All dwellings will be provided with Building Regulations compliant system 3 - continuous mechanical ventilation, which shall extract from each bathroom / kitchen and store cupboard where washer dryer connections are provided. The unit shall be provided with a boost facility from each area being served. The systems shall comprise air valves connected to the unit via PVC flat ductwork. The unit shall discharge the exhaust air to the atmosphere via an external airbrick. The discharge of the exhaust air shall be such that it does not cause a nuisance to other residents. Careful consideration shall be given to the location of the ventilation unit. The unit should be located in a cupboard, with ease of access for maintenance. The unit shall be supplied with a boost switch and/or humidity sensor, located in bathrooms / WC’s and kitchens. Pull chords are not acceptable. All kitchens shall be provided with an additional stainless steel re-circulating type extract hood. The supply air shall be provided via trickle vents in the windows. The installer shall provide and install within the apartments various ranges of rigid rectangular “flat duct” or rigid circular concealed ducting from each extract fan to discharge vitiated air to atmosphere, which shall be concealed from view within the suspended ceiling voids. The route and cross section arrangement of all ventilation ductwork shall be considered by the installer to ensure containment within the suspended ceiling void, and co-ordination with pipework services and electrical services also contained within the suspended ceiling void. Ventilation ductwork shall be provided with thermal insulation, condensation traps and fire dampers as required. Access panels shall be provided adjacent to each fire damper and in accordance with HVCA specification TR/19. The ductwork installation shall be provided with access panels in accordance with HVCA guide to good practice TR/19, as identified in section 3 and particularly table 1, table 2 and the notes to table 2. Air tightness for the development new construction will be set at 5m3/h/m2@50pa. 74
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Working drawings of the proposed ductwork arrangements shall also indicate all other services, together with their access space for future maintenance, thermal insulation, supports etc. The installer shall allow within the tender for modifications to ductwork routes to accommodate other services, structural elements, architectural elements etc and general co-ordination to accommodate the ductwork within the building confines as indicated on the architectural drawings. During the course of works the installer shall suitably protect all ductwork from the ingress of foreign matter by sealing all open ends of ductwork with polythene sheet and tape. All ductwork delivered to site shall have polythene sheet applied to open ends at the factory which shall not be removed until required for installation within the building. Ductwork delivered to site shall not be stored externally. The terminals from each ductwork system shall be colour finished to a colour selected by the architect, with final locations and type of terminals approved by the architect prior to installation. The Installer shall refer to the architect’s external elevation drawings to determine the external finishes and the type of external terminals, which will be most appropriate. Ventilation shall be provided to all store / cupboard areas where allocated as a washing machine cupboard. All ventilation systems are to be fully commissioned by an independent commissioning engineer and the result sheets handed over to the client as part of the handover documentation. The units are to be set at the appropriate fan speed setting to ensure the units are operating at their optimum energy performance whilst providing adequate ventilation to each dwelling. Allowing the system to over ventilate is not acceptable. The client’s representative is to be invited to witness the commissioning and must be given a minimum 5 days notice to attend. Communal Landlord Areas Natural ventilation will be provided to communal landlord areas by utilising the AOV systems, which will be fitted with a thermostat to activate slightly to introduce fresh air into the areas (door holders in internal communal corridors to be explored to allow for air circulation). This is to reduce the risk of overheating in the internal landlord areas from the district-heating network. Mechanical ventilation in these areas will not be provided. AOV’s are to be fitted with rain sensors (rain sensors will not override emergency activations). Generally Adequate ventilation, in excess of current Building Regulation requirements, must be provided to all areas to overcome common post occupancy problems, including: Increased thermal efficiency of building fabric creates high risks of both condensation and overheating, heat interface units create overheating within individual dwellings and communal heating distribution pipe-work causes overheating in communal corridors. Bin Store The bin stores for each block are to be naturally ventilated. This will entail the introduction of ductwork to achieve cross-ventilation as shown on the architects drawings. Live-work and Commercial Units
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Live/Work and Commercial units are not being fitted out at this stage, so no ventilation provision is to be made. 3.25
CONTROLS
The controls packages shall comprise the following elements to provide a complete system for controlling the mechanical services: i). ii). iii). iv). v).
7-day programmer and timer. Field and panel mounted controls. System and contracts engineering. Commissioning. Power and controls wiring installation.
The controls package shall comprise a 7-day heating and hot water programmer located in a convenient and easily accessible location within each dwelling. Each programmer shall be capable of independent control of heating inc: boiler and hot water with 5/2 day programming. Each day shall have up to 3 on/off periods and have manual/advance override facilities. The facility shall revert back to automatic controls at the next period. Each programmer shall have 24-hour time display. Ventilation units within the commercial spaces shall be provided with proprietary control devices as indicated on the tender drawings. 3.26
INSULATION AND FINISHES
All mains cold water services pipework shall be thermally insulated and vapour sealed to prevent condensation, increase in temperature and provide adequate frost protection. The installer shall take special care in setting out services to allow for thermal insulation. Any insulation thickness or finish comprised or reduced due to inadequate setting out or planning shall be replaced subsequent to the services being repositioned to the engineer’s satisfaction and at no extra cost to the contract. 3.27
SUPPORTS
The installer shall provide and fix suitable supports, hangers, bases etc for all plant, equipment and services other than structural steelwork supports specifically detailed elsewhere. All supports, hangers and bases etc shall be fully detailed and submitted for approval prior to manufacture or installation. All fixings to any structural steelwork shall use clamps, holes shall not be drilled, and the structural engineer shall approve all fixings to the structure etc. 3.28
HANDOVER
The Installer will be required to provide at handover the operating and maintenance documentation and record drawings, as detailed within Section 1 of this specification. In addition an abridged occupier’s handbook shall be provided for each apartment occupant, which shall be in accordance with Part L of the Building Regulations, and include copies of all relevant 76
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manufacturers’ literature. The client shall approve the format and content of the occupier’s handbook.
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SECTION 4 SANITARY SERVICES SPECIFICATION
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SECTION 4 SANITARY SERVICES SPECIFICATION INDEX 4 SCOPE OF WORKS ......................................................................................................... 80 4.01 SOIL AND VENTILATION INSTALLATIONS ................................................................... 80 4.02 INTERNAL WASTE INSTALLATIONS ............................................................................ 81 4.03 PIPEWORK GENERALLY. ............................................................................................ 82 4.04 DRY RISING MAINS .................................................................................................. 83 4.05 PIPE SUPPORTS........................................................................................................ 85 4.06 TESTING SOIL VENT & WASTE PIPES ......................................................................... 86 4.07 MATERIALS GENERALLY. ........................................................................................... 86
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SCOPE OF WORKS
The works under this section of the Specification shall include the design, supply, delivery to site, off-loading, storage, placing in position, erection, testing and commissioning of the soil, vent, waste, and overflow foul water pipework systems. The above ground drainage shall serve all sanitary appliances as indicated on the drawings. The sanitary fitments and brassware (including shower valves and fittings) will be supplied by the Main Contractor, who will be responsible for the delivery, off-loading, and storing of the same on the site. The Installer shall be responsible for the installation of sanitary fitments and “making in” of the taps, waste outlets, overflows, shower valves/shower fittings and all other associated equipment. All underground drainage works will be undertaken by the Main Contractor, and details of this are indicated on the Structural/Civil Engineers drawings. The Installer shall be responsible for all drainage works from the points of connection to the external below ground drainage, through the connections of sanitary appliances and equipment.
4.24
SOIL AND VENTILATION INSTALLATIONS
Soil and ventilating pipes are to discharge to atmosphere via roof vents complete with weathering apron and wire cowl. Access doors / cleaning eyes are to be provided to soil and ventilating pipes at each floor level in convenient locations and to waste pipes at each change of direction. Access to any soil pipe passing through a worktop should be at worktop level. Soil, waste and vent stacks should not pass through any habitable room. Where this is unavoidable suitable sound insulation must be provided within the duct casing. Vertical ducts and pipe casings may only be located in the corners of habitable rooms to ensure that they do not adversely affect furniture layouts. All horizontal pipe runs are to be concealed and all pipe-work and fittings should generally be concealed in ducts with viable access to all WC branches, waste pipes and stacks. Vertical pipework is to be encased. Provision shall be made for an adequate number of rodding eyes. Access points should be provided only from circulation spaces, bathrooms or kitchens and access from habitable rooms must be avoided. Waste and overflow pipes shall be uPVC with solvent welded joints, fixed according to manufacturers instructions. Combined waste from basins and baths is not acceptable, single waste pipes should lead directly to the stack. A 600mm waste, cap and running trap shall be provided for washing machines or a combined sink waste and W/M inlet.
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The contractor is to make due allowance for expansion throughout the installation. Push fit joints are not acceptable for jointing or expansion. All bathrooms shall be provided with connectors to soil stack to enable the easy connection of a waste pipe for the future installation of a shower. All pipe runs shall be roddable through a patent access plug at any change of direction. The soil and vent pipework is not to pass through the commercial units from the flats above. Pipework and fittings used on soil and vent pipes shall conform to BS 4514 and BS 416. Flexible connectors shall be used to connect the outlet of each WC pan to the branch soil pipework. Adequate provision must be made in the system for thermal expansion. The installation shall incorporate manufacturer’s recommendations regarding expansion, and electrical continuity. All pipework must be properly and securely fixed throughout its length, with adequate support provided at the base of vertical stacks. 4.02
INTERNAL WASTE INSTALLATIONS
Pipework Waste pipework from each of the sanitary fittings and equipment indicated on the drawings shall be provided. Pipework and fittings shall conform to BS 5255. They shall be joined to the main soil pipes using purpose made boss branches. Waste pipes shall be installed in accordance with current Codes of Practice to ensure that the water seal in each trap is maintained. 75mm deep seal traps manufactured of polypropylene and conforming to BS 3943 shall be fitted to the outlets of sanitary fittings as follows: Wash Hand Basins 32 dia Bottle Type Anti Syphon Sink 40 dia Bottle Type Anti Syphon Baths 40 dia Bath Trap assembled with combined overflow Showers 40 dia Shower trap Washing Machines 40 dia Trapped standpipe in adjacent base unit Dishwashers 40 dia Trapped standpipe in adjacent base unit Pipes shall not be left exposed, with the exception of waste pipe from sink prior to entering ducting (nationally 400mm pipe length). Waste runs over 3m in length to be 50mm diameter or provided with an anti-syphonic trap. Pipework should be routed so as not to obstruct or restrict appliance spaces. Joints between WC traps and branches shall be made with Key Terrain patent self-sealing connector or similar approved fixed in accordance with the manufacturer's instructions. WC pans shall be connected to the soil pipe with a ‘Multiquik’ connector for ease of disconnection. 81
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Waste and overflow pipes and fittings shall be uPVC. Any exposed waste and overflow pipes are to be self-coloured white. All baths, WCs, wash hand basins and sinks should be provided with overflows. A bath overflow manifold fitting is acceptable where the WC overflow cannot discharge through the external face of the building. No overflow pipes are to be taken through the elevations of the building where sound insulation criteria exist. Any overflow pipes through which hot water could discharge must be in copper pipework and metal fittings and turned downwards. WC and tank overflows to be self-coloured white. Overflows to drain to a point 150mm beyond the external wall finish or to an internal tundish, which in turn drains to the main stack. Overflows are not to drain onto the floor or directly into the main stack. Overflows should not run under floors unless this is unavoidable, in which case they should be solvent joint welded. Overflow pipes shall be conspicuously placed and project 150mm from the wall and terminate with an angle piece. Bath overflow manifolds may be used where standard overflows are impracticable. Waste Traps Traps shall be white HD polythene two-piece traps with a 75mm deep seal. Condensate Drains The contractor is to make an allowance for the discharge of condensate into the drainage system from the mechanical equipment including MVHR’s, HIU’s and boilers where fitted). Live-work and Commercial Units The drainage will terminate within the unit and will be capped off for future fit out. For details of the fit out of the live- work and commercial units see separate ER documents. 4.03
PIPEWORK GENERALLY.
All pipework included in this section of the Works must be installed in a proper manner in accordance with the current Codes of Practice. Any pipework, which is installed in an unsightly manner and is not to the satisfaction of the Engineer shall be removed and refitted at no extra cost. Efficient plugs shall be inserted in all ends of pipework left open during progress of the work. Plugs of paper or timber must not be used. Any remedial works undertaken due to the blockages in the finished pipework, or any damage resulting from such a blockage will be the responsibility of the Installer and any expense incurred due to such a blockage shall be borne by the Installer. Pipework generally in ducts and casings etc may be grey or black in colour. All exposed soil and waste pipework, including fittings and traps must be white. Provision must be made in the fixing of branch pipes connecting to the main vertical pipes to prevent shearing or deformation due to vertical movement of the main pipe. 82
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Pipework passing through all floors and through all fire rated walls shall be fitted with purpose made intumescent fire stop sleeves. Details of fire compartmentation shall be established by the Installer from the Architects drawings at the time of tender. 4.04
DRY RISING MAINS
This section includes for the provision of dry rising (or falling) mains to provide the Fire Brigade with a Fire Fighting facility. Design, supply, deliver, erect, test and commission dry rising (or falling) mains indicated on the drawings. Provide detailed and fully dimensioned builderswork drawings to permit the preparation of builders work holes by others. All work carried out shall be of the highest quality and shall comply with all requirements detailed herein and conform to current additions of the following: -
BS 5306: Part 0 BS 5306: Part 1 BS 5041 Parts 2, 3, 4 and 5 The current edition of the I.E.E Regulations The Area Building Control Officer The Area Fire Prevention Officer The Area Water Authority
4.04.1 STANDARDS OF MATERIALS AND WORKMANSHIP a)
The whole of the installation and materials shall conform to the relevant requirements within this Specification for pipework and fittings and the specific requirements indicated below.
b)
Dry rising and falling mains shall be galvanized heavyweight tube to BS 1387 with galvanized long swept fittings to BS 143 and/or galvanized mechanical joints and/or prefabricated black heavyweight steel tube to BS 1387 fabricated with long swept welding fittings to BS 1965 and galvanized after manufacture.
c)
The Contractor's attention is drawn to the necessity of providing earth continuity and in particular to mechanical joints where the joint must be installed with the proprietary earth bonding strap.
d)
Flange joints shall be to BS 4504.
e)
Underground pipework shall be of Blue Modified High Density polyethylene manufactured in accordance with the provision of BS 3284:1967 and BS 1972:1967 and their subsequent amendments and to the Class as specified by the Water Supply Bylaws.
4.04.2 GENERAL REQUIREMENTS a)
Dry rising mains with outlet valves shall be installed in the dedicated Fire Fighting stair and lift shaft lobbies as shown on the drawings.
b)
Dry risers shall serve all floor levels, including the roof and the Fire Brigade access level.
c)
The top outlet shall act as a fire brigade test outlet on rising mains and shall be installed at the roof level unless otherwise indicated on the drawings. 83
Union Road – K130121 d)
Mechanical Specification
Drainage of the dry risers will normally be via the drain valve fitted to each breeching inlet. Where the dry riser or (falling main) pipework drops below the level of the breeching inlet valved drains shall be provided at all low points. These shall be 25mm diameter minimum and shall be piped to the nearest gully or provision of a suitable drain point for hose connection.
4.04.3 DRY RISER INLET BREECHING a)
The breeching inlet shall be of the twin inlet type with a double 65mm instantaneous couplings to BS 336 each with caps and chains and integral non return valves.
b)
Each breeching inlet shall have a flanged 100mm outlet and shall be fitted with a 25mm drain valve which shall also have a blank cap and chain.
c)
The breeching inlet connection and fittings shall comply with the requirements of BS 5041, Part 3, and shall be of a type tested by the manufacturer to 20 bar.
d)
Breeching inlets shall be mounted within a box as indicated on the drawings or as detailed below.
4.04.4 DRY RISER INLET BOX a)
A breeching inlet box shall be supplied and installed by the Contractor for final building into the external wall of the building, or boundary wall so that the bottom of the box is at a level between 300 and 600mm above ground level. The dimensions of the inlet box shall comply with those in BS 5041, Part 5. Note-subject to final location at front boundary / fence line a specialist fabricated box and mounting facility should be allowed, subject to further detail. The breeching in box may be mounted either horizontally or vertically to suit the Architects external appearance requirements.
4.04.5 DRY RISER OUTLET VALVES a)
Outlet valves shall be of the 65mm diameter bronze gate type with a 65mm female instantaneous outlet to BS 336.
b)
The outlet shall be complete with a blank cap, which shall be secured to the body of the valve by a chain.
c)
The handwheel of each valve shall be secured in the closed position by means of a leather strap and padlock.
d)
The valves and their fittings shall comply with the requirements of BS 5041, Part 2, and shall be of a type tested by the manufacturers to 20 bar.
e)
Outlet valves shall be mounted within a cabinet as described below for building into the riser shaft enclosure.
4.04.6 DRY RISER OUTLET a)
Dry main outlet enclosures (where required) shall be supplied and installed by the Contractor for final building in. The dimensions shall comply with those in BS 5041, Part 4, and shall be as Norsen Type C.F. pattern finishes to the approval of the supervising officer.
84
Union Road – K130121
Mechanical Specification
4.04.7 TESTING AND COMMISSIONING a)
Each dry riser shall be hydraulically tested to at least 10.0 bar. Upon completion of the dry riser systems and prior to handover the Contractor shall arrange for the dry risers to be inspected and tested by the Building Control Officer. Any costs of statutory payments associated with these tests by the Building Control Officer shall be included for and paid by the Contractor.
4.04.8 USE DURING CONSTRUCTION a)
Where any building in which dry risers are to be installed exceeds a height of 18.0m, the dry rising main shall be installed and made available for use as soon as the building reaches 18.0 metres.
b)
The dry risers shall then be extended progressively as construction proceeds in order to provide fire fighting facilities.
c)
The Contractor shall allow for the temporary extension of the dry riser installations to the site boundary during construction.
4.04.9 PREFFERED MANUFACTURERS 4.05
Norsen Angus Fire
PIPE SUPPORTS.
Pipework shall be supported in such a manner so as to be securely fixed but shall allow for movement for expansion and contraction. Pipework supports shall be arranged so as to be as near as practicable to joints and changes of direction, each support shall take its share of the load. In vertical ducts pipework may be fixed to a length of mild steel angle or channel section spanning the width of the duct, the channel or angle section supports shall be drilled to take the supporting brackets. Where pipes are to be secured to structural members, purpose made clips or hangers shall be used. Where the use of such clips is impracticable, the permission of the Structural Engineer must first be obtained before any drilling is undertaken. The Installer shall then execute such drilling and the cost of this work shall be included in the Tender. Shot fired fixings shall not be used unless the approval of the Structural Engineer has been given in writing. The Installer shall be responsible for marking out the exact positions where pipe brackets are to be built in and for checking the accuracy levels and alignments of supports after building in. Supports for soil, vent and waste pipes shall be spaced at the following maximum dimensions: Pipe Size 32-40 50
Horizontal Support (metres) 0.5 0.6 85
Vertical Support (metres) 1.2 1.2
Union Road – K130121
Mechanical Specification 75-110
4.06
0.9
1.8
TESTING SOIL VENT & WASTE PIPES
A minimum of 7 days shall be given prior to carrying out tests. Notice shall be given to the Local Authority and the Clerk of Works that the systems are ready for testing. Clean water shall be provided and all assistance and appliances for testing during the contract and for the final tests. Tee pieces and plugs shall be provided as required and these shall be sealed off or removed as required or directed by the Engineer. All sections of the system shall be completely clear of any obstructions, debris and superfluous matter before any tests are applied to sections and upon completion of the Works. After installation and the sanitary appliances have been connected, the soil and waste pipes shall be closed at each end. Air shall then be blown into the system until a pressure of 50mm is indicated on the water gauge. Without further pressure being introduced the reading on the gauge shall remain constant for a period of at least 3 minutes. In addition to the test for air tightness, trap seals shall be tested for stability. When discharge tests are applied, every trap must retain not less than 25mm of water seal. The discharge test shall be repeated three times, traps being recharged before each test and the maximum loss of seal in any one test shall be taken as the significant result. All defects shall be located and revealed by the above tests. The tests shall be repeated until satisfactory results are obtained. 4.07
MATERIALS GENERALLY.
Soil and ventilating pipes shall be uPVC with solvent weld joint throughout. In the communal areas and where the soil and vent pipes enter the live-work/commercial areas shall be cast iron and protected with steel cages. Pipework to have a black finish where exposed externally.
86
Union Road – K130121
Mechanical Specification
SECTION 5 APPENDICES
87
Union Road – K130121
Mechanical Specification
SECTION 5 APPENDICES INDEX APPENDIX 1 – EMPLOYERS REQUIREMENTS .......................................................................... 89 APPENDIX 2 – PREFERRED MANUFACTURERS ........................................................................ 89 APPENDIX 3 – SCHEDULES OF EQUIPMENT ........................................................................... 90 Schedule 1 – Storage Tank / Booster set ................................................................................ 90 Schedule 2 – Radiators ......................................................................................................... 90 Schedule 3 – Mechanical extract unit ..................................................................................... 92 Schedule 4 – Water heater.................................................................................................... 92 Schedule 5 – Boiler .............................................................................................................. 92 Schedule 6 – Interface Unit / Cylinder .................................................................................... 92 Schedule 7 - Expansion Vessel ............................................................................................. 92 Schedule 8 - Booster Pumps ................................................................................................ 92 Schedule 9 - Pressurisation Units .......................................................................................... 92 Schedule 10 - LPHW Circulating pumps ................................................................................. 92
88
Union Road – K130121
Mechanical Specification
APPENDIX 1 – EMPLOYERS REQUIREMENTS Refer to Employers Requirements prepared by Notting Hill Housing Association. APPENDIX 2 – PREFERRED MANUFACTURERS No.
Element
Company
Additional Information
1.
Boiler
Valiant
Valliant Commercial range
2.
Fans
Vent axia
3.
Cold Water Storage Tanks
Hartons
Compact Booster
4.
Booster Pumps
Wilo
Compact Booster
5.
LPHW Pump
Wilo
6.
Interface unit / cylinder
Hartons
7.
Commissioning Valves
Hattersley Crane
8.
Pipeline Valves
Crane Hattersley Keystone
9.
Radiators
Quinn Barlo
10.
TRV
Drayton
11.
Drainage pipe work
Terraine
12.
Pressurisation unit / Expansion Vessel
Aquatech Preissman
13.
Manifold
Emmeti
14.
Shunt Pumps
Wilo
15.
Flue
Rite Vent
Single store plus unit
89
Round Top Type
Union Road – K130121
Mechanical Specification
APPENDIX 3 – SCHEDULES OF EQUIPMENT Schedule 1 – Storage Tank / Booster Set Ref
Location
Capacity
Dimensions
WT
Clock C Basement
7500 Litres
2500 × 2000 × 2000
Contact: The Heritage Works, Winterstoke Road, Weston-super-Mare BS24 9AN, Tel: +44 1934 421477 Fax: +44 1934 421488 Email:
[email protected]
Schedule 2 – Radiators Flat ref Flat type A2
Flat type A6
Flat type B2
Flat type B6
Rad Ref R1 R2 R3 TR1 R1 R2 R3 R4 R5 R7 TR1 TR2 R1 R2 R3 R4 TR1 R1 R2 R3 TR1
Output 1564 929 675 403 801 801 1183 1436 1436 801 403 403 929 1183 801 929 403 1183 929 929 403
Dimensions 1251 × 300 743 × 300 540 × 300 600 × 468 641 × 300 641 × 300 946 × 300 1149 × 300 1149 × 300 641 × 300 600 × 468 600 × 468 743 × 300 946 × 300 641 × 300 743 × 300 600 × 468 946 × 300 743 × 300 743 × 300 600 × 468
90
Model Double convector type 22 Double convector type 22 Double convector type 22 Opus horizontal Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Single convector type 11 Opus horizontal Opus horizontal Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Opus horizontal Double convector type 22 Double convector type 22 Double convector type 22 Opus horizontal
Union Road – K130121 Flat type C2
Flat type C5
Flat type C6
Flat type D1
Flat type D2
Flat type D3
R1 R2 R3 R4 TR1 R1 R2 R3 R4 R5 TR1 TR2 R1 R2 R3 R4 TR1 R1 R2 R3 R4 R5 TR1 R1 R2 R3 R4 R5 R1 R2 R3 R4 R5 R6 R7
Mechanical Specification 929 1183 929 675 403 1193 1193 1183 1183 675 403 403 1183 1183 1183 675 403 1310 1183 1564 1564 675 403 1183 929 929 675 403 801 1183 675 403 1183 1183 403
743 × 300 946 × 300 743 × 300 540 × 300 600 × 468 946 × 300 946 × 300 946 × 300 946 × 300 540 × 300 600 × 468 600 × 468 946 × 300 946 × 300 946 × 300 540 × 300 600 × 468 1047 × 300 946 × 300 1251 × 300 1251 × 300 540 × 300 600 × 468 946 × 300 743 × 300 743 × 300 540 × 300 600 × 468 641 × 300 946 × 300 540 × 300 600 × 468 946 × 300 946 × 300 600 × 468
Contact: Myson Radiators Eastern Avenue Team Valley Gateshead NE11 0PG
91
Double convector type 22 Double convector type 22 Double convector type 22 Single convector type 11 Opus horizontal Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Opus horizontal Opus horizontal Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Opus horizontal Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Opus horizontal Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22 Double convector type 22
Union Road – K130121
Mechanical Specification
Schedule 3 – Continuous mechanical extract unit Ref
Location
Unit Model
Electrical Supply and Rating
Control
MVHR1
Flats
CME1Q PLUS
230V, 50Hz
Centralised continuous extract fan with automatic boost facility via humidity sensor.
Contact: Titon International House, Peartree Road, Stanway, Colchester, Essex CO3 0JL 01206 713801
Schedule 4 - Water Heaters Ref
Location
Capacity
Electrical Supply and Rating
WH
Landlords – cleaners sink
10 Litres
240V, 50Hz
Contact: Heatrae Sadia Hurricane Way Norwich Norfolk NR6 6EA 01603 420220 Schedule 5 - Boilers Ref
Model
B1, B2 & B3
Valliant VKK2806
Rated Heat Output 51 - 275 kW
92
Water Temp (ºC)
Comments
80/60 F+R
Flue to atmosphere. Fully modulating output for pump control. LED fault and status indication.
Union Road – K130121
Mechanical Specification
Contact: Vaillant Ltd Nottingham Rd Belber DE561JT Ph - 08456020262
Schedule 6 – Cylinder / Interface Unit Ref
Model
Equivalent heat output
Cylinder Capacity
HW CYLINDER / HIU
Heatboard unit
23.4Kw
120 Litre
Contact: Harton Services, Unit 6, Thistlebook Industrial Estate, Eynsham Drive, London SE2 9RB Tel: 020 8310 0421 Fax: 020 8310 6785 Email:
[email protected]
93
Union Road – K130121
Mechanical Specification
Schedule 7 – Expansion Vessel Ref
Location
Capacity
Static head
EXP
Plantroom
230 Litres
1.5bar
Contact: Aquatech Pressmain Agm house, London Road Copford, Colchester COG1GT Tel: 01206215121
Schedule 8 – Cold water booster pumps Ref
Location
Flow
head
Model
BP
Plantroom
5.6L/S
3.8bar
Wilo – COR-2 – MHIE 803-VR/E3
Contact Wilo Second Avenue Centrum 100 Burton Upon Trent DE14 2WJ Staffordshire T +44 (0)1283 523000 F +44 (0) 1283 523099 E
[email protected]
94
Union Road – K130121
Mechanical Specification
Schedule 9 – Pressurisation unit Ref
Location
Model ref
EXP
Plantroom
Aquapak AP Series
Contact: Aquatech Pressmain Agm house, London Road Copford, Colchester COG1GT Tel: 01206215121
Schedule 10 – Heating circulating pumps
Ref
Location
Capacity
Static head
Model
P2
Plantroom
9L/S
100kpa
Wilo –DPE-50130/2-2/2
Contact Wilo Second Avenue Centrum 100 Burton Upon Trent DE14 2WJ Staffordshire T +44 (0)1283 523000 F +44 (0) 1283 523099 E
[email protected]
Schedule 11 – Shunt Pumps
Ref
Quantity
Location
Capacity
Kpa
Model
P2/P3/P4
3
Plantroom
3.2Kg/s
25
Yonos Maxo 40 – 0.5 / 8
95
Union Road – K130121
Mechanical Specification
Contact Wilo Second Avenue Centrum 100 Burton Upon Trent DE14 2WJ Staffordshire T +44 (0)1283 523000 F +44 (0) 1283 523099 E
[email protected]
Schedule 12 – Manifolds
Ref
Location
Manufacturer
Model
MD
Apartment services cupboard
Emmeti
Topway WHR
Contact Emmeti 6 Tannery Yard Witney Street Burford Oxfordshire OX18 4DW Ph (+44) 01993 824900
Schedule 13 – Flue
Ref
Location
Manufacturer
Model
Combined Flue Boiler 1 Flue Boiler 2 Flue Boiler 3 Flue
Plant room
Schiedel
Plant room
Schiedel
Plant room
Schiedel
Plant room
Schiedel
ICS – 358mm (Internal) ICS – 238mm (Internal) ICS – 238mm (Internal) ICS – 238mm (Internal)
96
Ø Ø Ø Ø
Union Road – K130121
Mechanical Specification
Contact Rite Vent Crowther Road Crowther Industrial Estate Washington Tyne & Wear NE38 0AQ Tel: 0044 (0)191 4161150 Fax: 0044 (0)191 4151263
97
