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TECHNICAL SPECIFICATION FOR
PLUMBING AND DRAINAGE DOMESTIC SUB-CONTRACT

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Proposed Residential Development
At 128 Waterloo Road, Kowloon,
On Lot No. KIL 1990
At 128 Waterloo Road, Kowloon, on Lot No. 1900
Technical Specification for
Plumbing and Drainage Installation
Domestic Sub-Contract
Consultant Engineer
AURECON HONG KONG LIMITED
Unit 1608, Tower B, Manulife Financial Centre,
223-231 Wai Yip Street,
Kwun Tong, Kowloon, Hong Kong
Job No : 254977
May2019
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TECHNICAL SPECIFICATION
PART NO. TITLE
1 GENERAL
2 MATERIALS AND WORKMANSHIP
3 TESTING AND COMMISSIONING
4 PARTICULAR
5 SCHEDULE OF EQUIPMENT
Appendix I DRAWING LIST
Appendix I! SPARE PART LIST
Appendix III DEMARCATION OF WORKS BETWEEN E&M CONTRACTERS
Appendix IV DEMARCATION OF WORKS BETWEEN E&M
SUB-CONTRACTORS & MAIN CONTRACTOR
Appendix V SCHEDULE OF RATES
254977- PLUMBING AND DRAINAGE INSTALLATION
DOMESTIC SUB-CONTRACT
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PARTl
GENERAL
PART I
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PART 1 - GENERAL
CONTENT
1.0 GENERAL REQUIREMENTS............................................................................................................. !
1.1 DEFINITIONS ......................................................................................................................................... 1
1.2 SITE PROTECTION OF EQUIPMENT ......................................................................................................... 1
1.3 RADIO AND TV INTERFERENCE............................................................................................................. 2
1.4 ITEMS OF ANY ONE CLASSIFICATION .................................................................................................... 2
1.5 CO-OPERATION WITH OTHER TRADES .................................................................................................. 2
1.6 INSTRUCTIONS ON PLANT OPERATION .................................................................................................. 2
1.7 NAMEPLATES AND LABELS ................................................................................................................... 2
1.8 PROGRAMME OF WORKS ...................................................................................................................... 3
1.9 SUPPLIERS ............................................................................................................................................4
1.10 SAMPLES OF MATERIALS ...................................................................................................................... 4
1.11 EQUIPMENT SCHEDULES AND DATA SHEETS......................................................................................... 4
1.12 DEFECTS LIABILITY .............................................................................................................................. 5
1.13 CHECKING DURING MAINTENANCE PERIOD .......................................................................................... 5
1.14 QUALITY CONTROL PLAN ..................................................................................................................... 6
1.15 GUARANTEES ....................................................................................................................................... 6
1.16 SITE SAFETY......................................................................................................................................... 6
1.17 TOOLS .................................................................................................................................................. 6
2.0 STANDARD OF iNSTALLATION ...................................................................................................... 7
2.1 STANDARDS.......................................................................................................................................... 7
2.2 WORKMANSHIP .................................................................................................................................... 8
2.3 LAYOUT OF SERVICES........................................................................................................................... 8
2.4 SETTING OUT........................................................................................................................................ 8
2.5 PROTECTION AND PAINTING ................................................................................................................. 9
2.6 CLIMATIC CONDITIONS AND EQUIPMENT ............................................................................................ I 0
3.0 DRAWlNGS AND REVIEW............................................................................................................... ll
3.1 INTERPRETATION OF DRAWINGS ......................................................................................................... 11
3.2 TENDER DRAWINGS ............................................................................................................................ II
3.3 CONTRACTOR'S DRAWINGS ................................................................................................................ 11
3.4 SHOP DRAWING .................................................................................................................................. 12
3.5 MANUFACTURER'S SHOP DRAWINGS ...................................................•................•............................. 13
3.6 CONTRACTOR'S COORDINATION OF MANUFACTURER'S SHOP DRAWINGS ........................................... 13
3.7 RECORD DRAWINGS AND CHARTS ...................................................................................................... 14
3.8 MAINTENANCE AND INSTRUCTION MANUALS ..................................................................................... 15
3.9 SUBMISSION OF DRAWINGS AND EQUIPMENT FOR REVIEW ................................................................. 16
3.10 EMPLOYER'S REPRESENTATIVE'S REVIEW ...•..............................•.....................•..........•...................... 16
3.11 REVIEW PROCEDURE FOR CONTRACTOR SUBMISSION ......................................................................... 16
3.12 CO-ORDINATION ................................................................................................................................. 17
PART I
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1.0 GENERAL REQUIREMENTS
1.1 Definitions
The defmitions of words or phrases commonly associated with the design, manufacture and
installation of the Plumbing and Drainage (P&D) Systems shall be those of the lET Wiring
Regulations, CIBSE Guides, British Standards and associated statutory regulations.
Words in this Technical Specification importing the singular only shall also include the plural,
and vice versa where the context requires.
Where any possible doubt exists as to the meaning of words or tenns used in this Technical
Specification, it shall be the Contractor's responsibility to obtain clarification from the
Employer's Representative and confirm the definition in writing.
Where the standard of any equipment/materials/worlananship are neither covered nor fully
described in this Technical Specification, the offered equipment/materialslworlananship shall
fully comply with the Hong Kong Government (HKSAR) Specifications as a minimum
standard requirement.
"Architect'', "Engineer", "Project Manager'', "Construction Manager", or ''Employer's
Representative" shall mean ""Employer's Authorized Representative" who has been
authorized from time to time by the Employer to perform such duties set forth in the
specification.
1.2 Site Protection of Equipment
All materials, plant and equipment shall be stored on site in accordance with the
manufacturer's recommendations and restrictions concerning guarantee or warranty. Metal
pipework may be stacked in the open, provided that such stacks are, in the Employer's
Representative's opinion, adequately protected from weathering.
Any materials, plant or equipment, which are included on applications for interim payments,
shall be stored in a manner, which facilitates checking by the Employer's Representative's
representative.
All storage accommodation and racks shall be provided by the Contractor unless otherwise
directed.
Electrical equipment or equipment with electrical component parts, specifically designed for
air-conditioned spaces, shall be delivered to and stored on site with vapour-proofprotection in
an area set aside for safe storage.
Equipment or component parts of equipment, not specifically designed to operate in air-
conditioned spaces, shall be delivered to and stored on site with a suitable weather-proof
protection in an area set aside for safe storage.
Where a piece of equipment or an appliance comprises more than one part, the parts shall be
separately packed and be clearly identified on the outside with the manufacturer's name and
component reference.
Particular care shall be taken to ensure that all factory applied finishes which are designed as
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visible fmished surfaces are adequately protected whilst stored on site.
Particular care shall be taken to protect component parts specifically designed to act as heat
transfer surfaces. These surfaces shall have purpose-designed packing to protect them whilst
in transit or stored on site.
Valve ports, the ends ofconduits, pipes, etc. shall be completely covered to prevent the ingress
offoreign matter.
1.3 Radio and TV Interference
1.4
All apparatus, where the normal operation will induce noise at radio frequencies, shall be fitted
with means for suppression ofinterference which may otherwise be caused to nearby radio and
TV reception.
The equipment and methods to be used in determining the level of radio interference shall be
as specified in BS 727 and the limits of interference shall in all cases be those specified in BS
EN 55014.
Items of Any One Classification
Identical parts of similar equipment shall be interchangeable and any items, fittings or
accessories which are used in quantity, shall in each case be the product of one manufacturer
and shall be used only for the service recommended by that manufacturer.
l.S Co-operation with Other Trades
1.6
The Contractor shall be required to co-operate with the Employer's Representative and other
Contractors/Suppliers who may be working on or connected with the Works. In positions
where construction work and other services are to be installed, adjacent to or in the vicinity of
his Contract works, he shall co-operate in every respect with the Employer's Representative,
the Carcass Contractor and other Contractors I Suppliers to determine the most suitable
sequence ofinstallation.
Instructions on Plant Operation
The Contractor shall include for any necessary assistance to the client's staffduring the course
ofthe installation to explain the purpose or function ofthe works.
The Contractor shall include for a period of ten plant operating days prior to Substantial
Completion of the Contract Works, to instruct the client's Representative in the day to day
running of the plant and systems. The location and function of all items listed in the record
documents shall be explained and the procedures for starting up, shutting down, isolating
sections, etc., shall be comprehensively explained and demonstrated to the Employer's
satisfaction.
1.7 Nameplates and Labels
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1.8
The Contractor shall provide and attach to each piece of major equipment a metal name and
rating plate to the approval ofthe Employer's Representative.
Each plate shall quote the name and address of the manufacturer, serial number, full rating
data and the date ofmanufacture.
Pennanent descriptive labels shall be provided for all switches, instruments, devices, fuses,
links, distribution boards, motor control cubicles and panels and the main apparatus contained
therein.
Labels for nonnal situations shall be of approved materials, suitable for site conditions and
resistant to mechanical shock. They shall have engraved lettering not less than 6 mm high.
Generally, labels shall be white with black lettering. Warning labels shall have red lettering on
a white background.
The designation on these labels shall be clear and shall, unless otherwise specified, incorporate
the appropriate device number along with concise descriptive wording both in English and
Chinese. The descriptive wording shall be submitted for approval prior to manufacture of
labels. Labels shall be finnly screwed or bolted. Self-adhesive fixings shall not be permitted.
Programme ofWorks
The Tenderer shall provide, with his Tender, details of the delivery and installation period
required for each system. The Contractor shall make sure that labour is available at all stages
ofthe Works, including overtime working where necessary, to achieve this programme, and to
carry out his Works in accordance with the requirements ofthe Employer's Representative.
The Contractor shall so arrange his prograrmne that all operations involved in the construction
of any part of the Works are carried out sequentially and without any delay between the
various stages in the construction process unless with the written approval of the Employer's
Representative.
The Contractor shall be responsible for infonning the Employer's Representative of his
detailed requirements in respect of water, drainage and electrical supplies, for the installation,
testing and commissioning ofthe equipment.
The Contractor shall immediately inform the Employer's Representative, of any delays caused
by labour shortages, late delivery ofmaterials and equipment, or a failure to meet prognunme
issued by the Employer's Representative which may affect his own programme.
Within two weeks after the awarding of the Contract, the Contractor shall produce a
programme in a form approved by the Employer's Representative showing the sequence and
performance times for the activities in the Contract Works and identifying critical activities.
The Contractor shall also produce a detailed progress schedule in the form of a bar chart
showing the prograrmned starting and finishing times for all the separate operations which
each activity comprises. The progress schedule shall be supplemented and substantiated by an
equipment submission schedule, sample submission schedule and a drawing submission
schedule in which the following information shall be included: items of equipment, samples
and drawings to be submitted for approval, dates for submissions, required dates for
approvals, ordering dates for equipment and details of equipment delivery periods. The
schedules shall be arranged in such fonn that actual progress can be recorded against each
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item. All schedules shall be submitted for Employer's Representative's approval.
The Contractor shall review the programme and any progress schedule on a continuous basis,
and submit an updated programme as directed by the Employer's Representative, for Site
Progress Meeting. The Contractor shall provide free of charge three copies of the programme
and related bar charts marked with actual progress and with proposed actions indicated to
achieve recovery of any progranune arrears.
The preparation and reviewing ofboth the programme and the bar charts shall be done in full
co-operation and consultation with the Employer's Representative.
1.9 Suppliers
The Tenderer shall submit with his Tender a detailed list of manufacturers' and suppliers'
names and addresses for materials and equipment he proposes to use for the execution of the
Works.
During the Contract period each manufacturer or supplier must be willing to admit the
Employer's Representative or his representatives to his premises during normal working hours
for the purpose ofinspecting and testing the materials and equipment offered.
All materials and equipment shall be new.
1.10 Samples of Materials
The Contractor shall supply a sample board containing samples of materials and accessories.
The Contractor shall obtain the Employer's Representative's written comment of the samples
and accessories before the commencement of the installation work. A label bearing the name
ofthe Contractor, the title of the Contract, the name of the manufacturer, country oforigin and
the specific service for which the material or accessory is to be used, shall be attached to each
item. The accepted sample board shall be displayed in the site office during the whole of the
contract period. The Contractor shall supply sufficient samples of materials as required for
testing purpose.
The Contractor shall be responsible for the delivery of the sample board and/or other samples
tu the Employer's Representative's office for review and back to the site-office after the
samples have been reviewed. The accepted samples shall form the basis of all future works in
the Contract.
1.11 Equipment Schedules and Data Sheets
All items of equipment and materials included in the Equipment Schedule and Data Sheets
shall fully comply with the relevant Technical Specification and Drawings. The Employer's
Representative may accept alternatives to equipment and materials specified, if proposed by
the Contractor in writing, and provided always that such alternatives are fully in compliance
with this Technical Specification and Drawings. These alternatives shall not impose any
additional contractual and financial liabilities on the client, and shall be submitted so as not to
cause any delay to ordering, delivery or installation. Otherwise any alteration to the
Equipment Schedule, as proposed originally in the Tender document, is not allowed.
Where equipment is interconnected to form a complete system, their characteristics of
254977 - PLUMBING AND DRAINAGE INSTALLATION
DOMESTIC SUB.CONTRACT
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performance and capacitiesshall be matched so as to give efficient, economical, safe and
sound operation ofthe complete system.
1.12 Defects Liability
The Contractor shall be responsible for carrying out corrective maintenance to uphold the
complete Warks in an efficient state during the Maintenance Period as specified in this
Contract.
During the Maintenance Period, the Contractor shall, at his own cost, be responsible for
making good all defects, breakdowns or faults inunediately they are discovered or become
apparent due to bad workmanship, or the use of defective or improper materials, or the use of
any parts or items which do not fulfil the purpose for which they were specified or intended,
or the provision of any equipment or item which does not meet the specified performance
criteria. Such cost shall include all material, plant, equipment, labour, performance testing,
scaffolding, platform and re-commissioning necessary to satisfY the Employer's
Representative that the remedial work is acceptable.
This requirement shall not absolve the Contractor from his responsibility to rectifY latent
defects, at his own cost, after the expiration ofthe Maintenance Period.
If any fault or defect should come to light during the Maintenance Period in any of the
apparatus, equipment, or installations, the Employer's Representative shall have power to
require the Contractor to carry out further tests to isolate the fault or defect and subsequently
to prove that the fault or defect has been remedied.
If it becomes necessary for any part of the Works to be replaced or removed, then the
Maintenance Period shall be extended to apply to the portions so renewed and replaced for a
period of six months from the date of such replacements or renewals, or until the end of the
Maintenance Period whichever is the later.
The Employer's Representative reserves the right to remedy any defects and debit any cost for
such remedies to the cost of the Contract Works, in the case of emergency, or fuilure of the
Contractor to comply with the above.
1.13 Checking During Maintenance Period
Unless otherwise specified elsewhere, the Contractor shall be required to carry out checking
on his Works during the Maintenance Period.
Unless otherwise specified elsewhere, such checking shall at the minimum include the
checking of all equipment, control panels and safety devices for healthy functioning, the
checking, and tightening where necessary, all electrical connections to and from motor control
panels.
The scope, extent and frequency of such checking shall be as recommended by the respective
manufacturer where relevant, and agreed by the Employer's representative. In all cases such
checking shall be carried out not longer than six months after the date of Substantial
Completion.
Such checking shall exclude the replacement and cleaning ofconsumable or disposable items.
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The Contractor shall submit a log book recording all maintenance visits and fully listing all
data readings to the Employer's Representative for endorsement upon completion of the
Maintenance Period.
1.14 Quality Control Plan
1.15
1.16
The Contractor shall submit a Quality Control Plan to the Employer's Representative for
approval within two (2) weeks after award ofthe Contract.
The Contractor shall provide a technically competent engineer, with minimum 10 years
working experience in Hong Kong, full time on site.
The Contractor shall always keep a full set ofSpecification and Drawings on site.
Guarantees
Notwithstanding the Contract Conditions, all equipment normally guaranteed for a time
beyond the termination date of the Maintenance Period for this Contract shall be held to
remain under guarantee for the maximum period.
Site Safety
The Contractor shall throughout the progress ofthe Works have full regard for the safety ofall
persons upon the site and shall keep the Works in an orderly state appropriate to the avoidance
ofdanger to such persons.
If the Contractor employs other Contractors on the site, he shall require them to have the same
regard for safety and avoidance ofdanger.
The Contractor shall employ only such persons who are skilled and experienced in their
trades. The Employer's Representative can at liberty object to any employee of the Contractor
who, in the opinion of the Employer's Representative, misconducts himself or is incompetent
or negligent in the performance of his duties. The Employer's Representative reserves the
right to request the removal from site of any Contractor's employee whose conduct is
prejudicial to safety or health.
1.17 Tools
The Contractor shall supply one complete set of special tools that are necessary for routine
maintenance to be carried out These tools shall be supplied in a suitable hard wood or steel
toolbox and handed to the Employer's Representative on completion.
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2.0 STANDARD OF INSTALLATION
2.1 Standards
All materials and workmanship shall comply, with all relevant sections of the following Code
of Practice, requirements and regulations and all subsequent amendments issued prior to the
date of tendering, unless otherwise specified on the Drawings or the Particular (Part 4) of this
Technical Specification :
i.
ii.
iii.
iv.
v.
CIBSE Guides, latest edition, published by the Chartered Institution of Building
Services Engineers.
Plumbing Engineering Services Design Guide, latest edition, published by the
Institute ofPlumbing.
Waterworks Ordinance and Waterworks Regulations (Laws of Hong Kong,
Chapter 102) current edition.
Hong Kong Waterworks Standard Requirements, current edition.
Current edition of 'lET Wiring Regulations for Electrical Installations', issued by
the Institution of Electrical Engineers. The terms "JET Wiring Regulations and
"JET Regulations" used elsewhere in the Specification shall refer to these
document.
VI. Current edition of 'Code of Practice for the Electricity (Wiring) Regulations' issued
by Electrical & Mechanical Services Department, HKSAR.
vii. Public Health and Municipal Services Ordinance (Laws of Hong Kong, Chapter
132), current edition.
viii. Building Ordinance and Regulations (Laws of Hong Kong, Chapter 123), current
edition.
ix. Food and Enviromnental Hygiene Department Regulations and Requirements.
x. Enviromnental Protection Department requirement and relevant statutory
regulations.
xi. Relevant British Standards.
The Works carried out under this Contract shall be consistent with good practice and to the
satisfaction ofthe Employer's Representative.
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Unless stated otherwise, all materials and workmanship covered by a British Standard or Code
of Practice, whether detailed in the Specification or not, shall comply with the requirements of
the relevant British Standard.
Where equipment complying with other international standards/specifications is offered, the
Contractor shall satisfY the Employer's Representative that the quality and performance
specification of the equipment offered is equivalent to or better than that specified in the
appropriate Code ofPractices, Regulations or British Standards.
2.2 Workmanship
All workmanship shall be subject to approval ofthe Employer's Representative.
The Employer's Representative reserves the right to reject any part of the installation not
complying with this Technical Specification, and the Contractor shall carry out the necessary
remedial work or replacement, free of charge and without delay to the other Contracts.
No work shall be covered up or put out of view without approval of the Employer's
Representative. The Contractor shall provide notice and full opportunity for the examination
and measurement ofany work which is about to be covered up or put out ofview.
No approval or acceptance by the Employer's Representative shall relieve the Contractor ofhis
responsibilities under the Contract for the quality of materials and the standard of
workmanship in the Works.
2.3 Layout of Services
The services and equipment arrangements shown on the Tender Drawings accompanying this
Technical Specification are intended to indicate the layont to be generally adhered to, but the
actual layout of services shall be such as to ensure the neatest possible arrangement. Certain
drawings are diagrarmuatic and are to be interpreted as such, making due allowance for site
conditions.
If any modifications are required due to any particular site conditions, then such details shall
be forwarded to the Employer's Representative for his approval. The whole installation shall
be to the complete satisfaction ofthe Employer's Representative.
2.4 Setting Out
The Contractor shall be responsible for checking and endorsing the true and proper setting-out
of the Works show in the CSD and CBWD drawings and for the correctness of the position,
levels, dimensions and alignment for all parts of the works and for the provision of all
necessary instroments, appliances and labour in connection therewith. If at any time during the
progress of the Works any error shall appear or arise in the position, levels, dimensions or
alignment of any part of the Works, the setting out for which the Contractor was responsible,
the Contractor on being requested to do so by the Employer's Representative shall at his own
expense rectifY such error to the satisfaction ofthe Employer's Representative.
The checking of any setting out or of any line or level by the Employer's Representative or his
representative shall not in any way relieve the Contractor of his responsibility for the
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correctness thereof, and the Contractor shall carefully protect and preserve all bench-marks,
sight rails, pegs and other things used in setting-out the Works.
The Contractor shall be responsible for taking all his own dimensions on site, checking runs
and levels and marking out for builders work and shall allow for such work in his Tender.
Any unnecessary work carried out by the Carcass Contractor and other Contractors I Suppliers
due to inaccuracy of the Contractor's drawings, dimensions, or marking out shall be paid for
by the Contractor.
The Contractor shall ensure that the setting out of equipment permits it to fit into the space
allocated and allows access for proper operation, maintenance and replacement purposes.
2.5 Protection and Painting
The Contractor shall be responsible for the protection ofhis Works during and after erection.
All surfaces liable to rust or corrosion shall be fully protected at all stages of the Works, and
the protection maintained during the course of erection until the installations are fmally
painted, or other finishes applied, prior to completion.
Plant and equipment for use in the Works which is factory·finished and is delivered to site
shall be protected in accordance with the manufacturer's instructions. The Contractor shall
seek the supplier's or manufacturer's instructions in writing and forward copies of all resultant
correspondence to the Employer's Representative.
Where particular methods of finishing and painting are not specified elsewhere, the following
requirements shall be met:
1. All metal work shall be adequately protected against corrosion and oxidation.
u. All frames, supports, cladding and the like, of mild steel construction, shall be
thoroughly cleaned to remove all scale, rust, oil and grease before painting, and
treated with a rust inhibiting solution. One coat of metallic primer shall then be
applied followed by two coats of oil bound gloss paint to BS381C, the colour to be
approved by the Employer's Representative.
iii. Parts which are normally plated shall be heavily plated in hard chromium fmish or
Parkerised, whichever is the more suitable. Cadmium or tin zinc plating will not be
accepted.
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2.6
Any damage to finishes on equipment and plant after leaving the manufacturer's work shall·be
made good inamediately as follows:
i. Where a metal coating is damaged, it shall be cleaned to the parent metal and
coated with a zinc rich primer or an alternative approved by the Employer's
Representative.
ii. Damaged areas ofpaintwork shall be repaired locally by cleaning to bare metal and
repainted using the complete paint system previously applied.
The service at E&M plants shall be painted by the Contactor whereas that at public area areas
shall be painted by the Carcass Contractor
Climatic Conditions and Equipment
The site shall be assumed to have the following climatic conditions.
Climate description
Temperatore range
Relative Humidity
tropical
soc to 35°C average
30% to 100%
All equipment shall be required to function continuously at the following ambient conditions
unless otherwise stated:
Temperature
Relative Humidity
40°C
99%
All equipment shall be tropicalised and vermin proofed.
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3.0 DRAWINGS AND REVIEW
3.1 Interpretation of Drawings
3.2
The Technical Specification, and any Drawings and other documents attached thereto and
issued by the Employer's Representative shall be deemed to include, whether or not
specifically or explicitly mentioned or shown, any materials, accessories or work as may be
necessary for the satisfactory completion of the Works. The Tenderer shall make due
allowance in his Tender for such materials or work.
Where a discrepancy exists between the Drawings and Technical Specification, or where the
interpretation of either is in doubt, the Tenderer shall obtain written clarification on such
matters before submitting his Tender. Such clarification from the Employer's representative
to the Tenderer dated prior to the submission of the Tender, shall form part of the Contract
Documents.
Tender Drawings
The Tender Drawings listed in the Technical Specification are provided for the Tenderer's
goidance and information when tendering.
After the award of the Contract, the Employer's Representative will furnish I copies of the
Drawings and within a reasonable time also furnish such further drawings as are reasonably
necessary to enable all the Employer's Representative's Instructions to be carried out. The
Employer's Representative will also provide all details, which in the opinion of the
Employer's Representative are necessary for the execution of any part ofthe work.
Additional copies of the Drawings and of the Technical Specification can be provided to the
Contractor upon written request to the Employer's Representative, but the Employer's
representatives will charge for such additional copies at current commercial rates.
3.3 Contractor's Drawings
The Contractor shall prepare and be responsible for snbmitting 8 copies (2 sets for client, I set
for architect, I set for quantity surveyor, I set for strnctoral engineer, I set for building
services engineer, 2 sets for site office) of the following drawings in AutoCAD 2010 version
and PDF copies to the Employer's Representative:
i. Shop Drawings.
ii. Manufactorer's Shop Drawings.
iii. Record Drawings and Charts.
The symbol notation on all drawings shall be the same as the Tender Drawings. New symbols,
not previously used on the Tender Drawings shall be agreed with the Employer's
Representative.
The Contractor shall be responsible for verifying the accuracy of all dimensions abstracted
from the Tender Drawings or Employer's Representative's drawings and used in the
preparation ofhis drawings.
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3.4 Shop Drawing
The Contractor shall, before the relevant work proceeds, prepare and submit, for review by the
Employer's Representative, all shop drawings showing details of his proposals and selected
materials /equipment /plant such as plant room layout, installation details, switchboard
configuration etc to suit the material/ equipment offered by the Contactor for the execution of
the Contract Works. The Shop Drawings shall be based on the Tender Drawings, and shall
take into account all modifications, either to the building or to the installation which may have
taken place, and incorporate details ofthe actual items ofplant and equipment to be installed
The Shop Drawings shall be in such detail and with all necessary dimensions as to enable the
Contract Works to be installed, and shall indicate all conduit layout, etc., including bends,
tee's, connections, etc., necessary for installation, and also particular installation methods to be
applied in certain instances. These drawings shall also relate to Builder's Work Drawings
confirming relationships to pipe routing, etc.
The Contractor shall also prepare all necessary Schedules ofEquipment, and necessary wiring
diagrams, including internal diagrams for items of electrical equipment and diagrams showing
the inter-connections between different items.
The Contractor's Shop Drawings shall be prepared to a scale of 1:100 fur all layouts and 1:50
(minimum) for all details and sections. Shop Drawings of other scales may be required as and
when considered necessary by the Employer's Representative.
The Contractor's Shop Drawings shall detail and dimension the following, where relevant:
i. Site plan, general notes, legends and abbreviations.
ii. Layout drawings giving accurate and dimensioned locations of all plant and
equipment included in the Contract, either on-site or off-site.
iii. Label schedules, wordings and formats for the labelling of equipment and
distribution pipework.
IV. Detail drawings indicating the equipment, pipework, trunking, arrangement of
plantrooms, service voids, service ducts, and standard arrangements such as
supports, anchors and insulation methods.
v. Schematic diagrams for each system to confirm all pipework size, flow rates, cable
size, equipment size, the principle of operations, and operating conditions
indicating provisions for testing, balancing and commissioning.
vi. Plant schematics showing the control layout, with each item identified, and
including a brief description of the control operations and associated interlocking.
Logic sequence and wiring diagrams, showing the connections of all items of
electric control equipment and interlocking details as defined on the plant control
schematics and specification.
vii. Detail of fibre-glass water tanks showing positions of inlet, outlet, overflow, vent,
drain, etc.
Apart from the combined builder's work drawings provided by the Employer's
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Representative, the Contractor shall provide fully detailed Builder's Work details for their
particular equipment I installation to facilitate the execution of the Contract Works, and allow
their integration into the project. These drawings shall show dead and live loads of all
equipment, and fully dimensioned details of all equipment bases, wall chases, and
penetrations.
This information shall be prepared in sufficient time for incorporation in the Employer's
Representative's progranune.
In cases where preliminary Builder's Work and structnral information has already been given
by the Employer's Representative, such information shall be confirmed by the Contractor
(including confirmation of weights of items of equipment, sizes of access ways, etc.) and
incorporated on his drawings.
The details required by the Employer's Representative shall be provided by the Contractor as
directed, which may require advance information to be provided by the Contractor before the
Works defined in this Technical Specification are to commence. The Contractor shall be
responsible for checking any details that may have been given before commencement of the
Works to ascertain that the said advance details are correct.
The Contractor shall be liable for all costs associated with the late submission or omission of
Builder's Work information.
3.5 Manufacturer's Shop Drawings
3.6
The Contractor shall submit 8 copies for review Shop Drawings of any item of plant or
equipment produced by manufactnrers or equipment suppliers, indicating principle
dimensions, fixings, connections and all other relevant details.
The Contractor shall provide engineering drawings showing the construction, external and
internal layout of equipment and wiring diagrams comprising internal wiring, schematics of
interlocking and external wiring diagrams, for the complete system in the equipment panels.
The Drawings shall also show all electrical, pipework and auxiliary connections from the
plant/equipment to external system component(s).
Contractor 's Coordination of Manufacturer's Shop Drawings
All drawings, schedules or other information provided by the suppliers of the Contractor, for
whom the Contractor is responsible, shall be checked and coordinated by the Contractor, and
such checking and coordination shall ensure that all requirements of the Contract
documentation have been incorporated.
When this procedure has been completed, the Contractor shall forward 8 paper prints of the
coordinated drawings, or 8 copies of the coordinated schedules or other information to the
Employer's Representative in a similar manner to that described for the Installation Drawings.
No order to his supplier, for whom the Contractor is responsible, to commence manufacture or
installation shall be given until written acceptance has been given by the Employer's
Representative.
Any cost arising from failure to meet the above conditions shall be borne by the Contractor at
PART I l/13
PD/17

(
no cost to the Contract.
3.7 Record Drawings and Charts
Within one month ofthe Practical Completion ofthe installations, the Contractor shall provide
to the satisfaction of the Employer's Representative, 8 sets of white prints and one set of
computer disks of AutoCAD files showing the whole of the services installed. Prior to this
formal issue, the Contractor shall submit 8 copies of his proposed fmalized Record Drawings
to the Employer's Representative for review.
The drawings shall include all the information listed as required for the Installation Drawings
and the following, where relevant:
i. Fully indicate with accurate dimensions, the sizes and positions of all equipment,
pipework, cable contaimnents, together with all inspection points, etc.
11. Latest floor plans, with sections as necessary shall be provided.
The complete symbol notation used for all Record Drawings shall be shown on a separate
drawing.
Preparation of the Record Drawings shall proceed during installation of the Works as each
section is completed.
In addition to the foregoing Record Drawings, the following charts and drawings, where
relevant, shall be framed under glass and hung in all plant rooms :
i. Plantroom key drawings, showing all plant item numbers, locations and duties.
ii. Plumbing and Drainage system schematic diagrams with identification of each
equipment.
iii. Control schematic diagrams.
iv. Valve charts consisting of schematic drawings of pipe work layouts showing
identification and duty.
v. A placard to be provided for each motor control panel location detailing
"Instructions for the Treatment ofElectric Shock".
PART I 1114
PDI18

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3.8 Maintenance and Instruction Manuals
At the same time as the Record Drawings, the Contractor shall provide the Employer's
Representative with 8 copies of the fmal Maintenance and Instruction Manual covering the
following:
i.
ii.
iii.
IV.
v.
vi.
vii.
Index ofRecord Drawings.
General description of systems.
Setting up and operating instructions for all equipment and systems installed.
Control sequences for all systems installed.
The scheduled details of all equipment settings and actual values maintained in
controlled variables during commissioning.
Frequency and details ofroutine maintenance required.
Manufacturers' literature, including detailed drawings and electrical circuit details,
printed operating and maintenance instructions, for all specific items of equipment
and plant supplied under this Contract.
viii. Schedules of all equipment and plant, stating their locations within the building,
duties and performance a figures. Each item of equipment shall have a unique
code number, cross-referenced with the Record Drawings. The Manufacturers'
name, address and telephone number for every item of equipment and plant shall
be listed in the Manual together with catalogue list numbers for replacement
purposes.
ix. A comprehensive report of Tesring and Commissioning of all system and
equipment in this Contract.
The Manuals shall be encased in an A4 size, plastic covered loose leaf ring blinders, with hard
covers. Drawings larger than A4 shall be folded and accommodated in the binder so that they
may be unfolded without being in any way detached from the rings.
2 Manuals with provisional Record Drawings shall be made available at least one month
before completion to enable client's staff to familiarize themselves with the installation. These
should be of the same format as the final Manuals with temporary insertions for items which
carmot be finalized until the Works are completed and tested.
Attention is drawn to the fact that the Works will not be accepted as complete and that final
payment will not be made for the Works until the Manuals have been accepted by the
Employer's Representative as being satisfactory.
PART I 1/15
PD/19

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3.9 Submission of Drawings and Equipment for Review
Information for review must be submitted in accordance with the agreed programme of work
and in packages relating to complete buildings or previously agreed parts ofthe building.
Each package must include:
1. Installation details.
ii. Associated Manufacturer's shop drawings.
iii. Technical information ofproposed equipment and materials.
iv. Any other relevant information required by the Employer's Representative.
Each submission must be accompanied by a letter which:
i. Identifies the contents ofthe submission in detail.
ii. Refers to any previous submissions of the information and any relevant
correspondence.
iii. Refers to the purpose of the submission and any other requirements of the
Contractor.
3.10 Employer's Representative's Review
The Contractor shall obtain the Employer's Representative's comment of his information
before it is used for ordering, fabrication or installation. The form of conunent will be an
examination of the drawings and/or samples by the Employer's Representative to ensure that
the design criteria and engineering principles described in the Tender Documents have been
correctly interpreted and applied by the Contractor.
Acceptance will not entail any checking ofworking dimensions on the drawings.
The Contractor must carry out his own checking procedure before submitting information for
comment, this checking must cover not only his own work, but that of Manufacturers and
Specialists for whom he is responsible.
Acceptance of information will in no way relieve the Contractor ofhis responsibility for error
in his work or ofhis other contractual responsibilities and obligations.
The Contractor shall allow a period of three weeks in his programme for the Employer's
Representative to view and return the Contractor's submission with comment. The Contractor
shall also indicate in his programme time allowed for resubmission of drawings not accepted
by the Employer's Representative.
3.11 Review Procedure for Contractor Submission
8 copies ofall information and drawings shall be submitted to the Employer's Representative.
7 copies will be retained by the Employer's Representative and the eighth copy will be
PART I 1/16
PD/20

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returned to the Contractor. Original copies of the equipment catalogue shall be submitted as
required by the Employer's Representative.
The infonnation will be returned either:
i.
ii.
iii.
iv.
Acceptable
Conditionally
Acceptable
Acceptance Pending
-Resubmit
Not Acceptable
-Re-submit
in which case it may be used for ordering,
fabrication or installation, or,
in which case the infonnation may be used for
ordering etc., subject to the comments, on the
understanding that the Contractor will revise and
re-submit the infonnation for fonnal review
immediately, or,
in which case the submission is incomplete and
resubmission with further infonnation is required,
or,
in which case it must be re-submitted for further
review
Modifications and variations found to be necessary after acceptance has been given must be
re-submitted for further review in the above manner.
Revision marks must be included on all revised drawings, and the revisions must be fully and
clearly described.
8 copies of all accepted drawings shall be submitted to the Employer's Representative for
general distribution to the Carcass Contractor and other interested parties.
3.12 Co-ordination
The Contractor shall provide sufficient technical infonnation for the coordination of
Installation Drawings and to ensure that the installation drawings have been co-ordinated and
integrated with that of the Carcass Contractor, other Contractors I Suppliers, the structure, and
building elements, before work commences. In addition to the Works for which he is
responsible, the drawings must show the structure, adjacent building elements and the zone
required by other Contractors to install, operate and maintain their equipment.
Ifthe Contractor deviates from the design intent of the Drawings and Technical Specification,
he shall ensure that either this deviation does not involve a change in any of the Carcass
Contactor's, any other Contractor's installations, or that any change necessary in the Carcass
Contractor's, any other Contractor's Installations does not incur an additional cost to their
Contracts.
The Contractor shall be fully liable for any cost incurred through his lack ofco-ordination.
DOMESTIC SUB·CONTRACT
PART I 1117
PD/21

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On Lot No. KlL 1990
PART2
MATERIALS AND WORKMANSHIP
I PART2
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PD/22
JOB NO. 254977

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On Lot No. KlL 1990
PART 2- MATERIALS AND WORKMANSHIP
CONTENT
JOB NO. 254977
1.0 PUMPS ......................................................................................................................................................... !
1.1 CENTRIFUGALNERTICALMULTI-STAGE/BOOSTERPUMPS ..........................•........................................... 1
1.2 IN-LINEPUMPS(NOTUSED) ....................................................................................................................... 4
1.3 DRAINAGE SUMP PUMPS ........................................................................................................................... 4
1.4 PNEUMATIC VESSELS .....•.......................................................................................................................... 4
1.5 WATERHAMMERARRESTER .................•....................................................................•.................•........•.. 4
1.6 VARIABLE FREQUENCY DRIVE (VFD) .............................•............................•........................................... 6
2.0 PIPEWORK AND ACCESSORIES .......................................................................................................... 9
2.1 GENERAL .......................................................•.................................................••.................••..............•..... 9
2.2 BLACK MILD STEEL PIPEWORK............................................................................................................... II
2.3 GALVANIZED MILD STEELPIPEWORK..................................................................................................... II
2.4 COPPER PIPEWORK.........................•...........................................................•..................••........................ 12
2.5 PVC PIPEWORK ..................................................••............................•.................••...........................•...... 14
2.6 DUCTILE IRON PIPEWORK ...............................•......................................••................•.............................. 15
2.7 CAST IRON PIPEWORK..................................................................................................................•.......... I6
2.8 WELDED JOINTS FOR STEEL PIPEWORK .................................................................................................. 17
2.9 FLANGED JOINTS ON STEEL PIPEWORK.....................................•............................................................. 17
2.10 MECHANICAL GROOVED JOINTS ............................................................................................................. 18
2.11 PIPE SUPPORTS AND HANGERS ............................................................................................................... 19
2.12 FIRE COLLAR .......................................................................................................................................... 21
2.13 GENERAL PROVISION AGAINST EXPANSION............................................................................................ 21
2.14 PIPEWORK GUIDES AND ANCHORS .......................................................................................................... 21
2.15 EXPANSION JOINTS.................................................................................................................................. 22
2.16 VENTING AND DRAINING ........................................................................................................................ 23
2.17 PIPESLEEVES .......................................................................................................................................... 23
2.18 PIPEANCHORS .................................................................................................................................... 23
2.19 PUDDLE FLANGES ................................................................................................................................... 24
2.20 EPOXY COATED CAST IRON PIPING SYSTEM ........................................................................................... 24
2.21 THERMAL!NSULATION............................................................................................................................ 24
2.22 UNDERGROUND PIPEWORK ..................................................................................................................... 25
2.23 INSTANTANEOUS TYPE WATERHEATER ................................................................................................. 25
3.0 PIPELINE VALVES AND FITTINGS ................................................................................................... 26
3.1 GENERAL ................................................................................................................................................ 26
3.2 GATEVALVES ......................................................................................................................................... 27
3.3 GLOBEVALVES....................................................................................................................................... 27
3.4 CHECK VALVES ...................................................................................................................................... 28
3.5 PRESSURE REDUCING VALVE (FIXED RATIO TYPE) ................................................................................ 28
3.6 BUTTERFLYVALVES ............................................................................................................................... 29
3.7 BALLFLOATVALVES ............................................................................................................................. 30
3.8 SAFETY AND PRESSURE RELIEF VALVES ................................................................................................. 30
3.9 STRAINERS .............................................................................................................................................. 31
3.10 STOPCOCKS ............................................................................................................................................. 31
3.11 DRAINVALVES ....................................................................................................................................... 3i
3.12 DRAIN COCKS ......................................................................................................................................... 32
3.13 GAUGECOCKS ........................................................................................................................................ 32
PART2
PD/23

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Proposed Residential Development JOB NO. 254977
On Lot No. KIL 1990
3.14 FLEXIBLE PUMP CONNECTORS................................................................................................................ 32
3.15 AUTOMATIC AIR ELIMINATOR VALVES .................................................................................................. 32
3.16 MANUAL AIR VENTS............................................................................................................................... 33
3.17 VORTEX INHIBITORS .............................................................................................................................. 33
4.0 DRAINAGE INSTALLATION ............................................................................................................... 34
4.1 WATER-CLOSET CONNECTORS ............................................................................................................... 34
4.2 TRAPS ..................................................................................................................................................... 34
4.3 RAIN-WATER OUTLETS........................................................................................................................... 34
4.4 FLOOR DRAINS........................................................................................................................................ 34
4.5 FRESH AIR INLETS................................................................................................................................... 35
4.6 GULLIES (NOT USED).............................................................................................................................. 35
5.0 CONTROL AND STARTER PANELS .................................................................................................. 36
5.1 GENERAL ................................................................................................................................................ 36
5.2 PANEL CONSTRUCTION ........................................................................................................................... 36
5.3 EQUIPMENT IN STARTER AND CONTROL PANELS .................................................................................... 37
6.0 LV SWITCHGEAR.................................................................................................................................. 40
6.1 MOULDED CASE CIRCUIT-BREAKERS ..................................................................................................... 40
6.2 MINIATURE CIRCUIT-BREAKERS............................................................................................................. 41
6.3 FUSE SWITCHES ...................................................................................................................................... 42
6.4 SWITCH FuSES .....................................................................•.................................................................. 42
6.5 SWITCHES ............................................................................................................................................... 42
6.6 DISCONNECTORS..................................................................................................................................... 42
6.7 LoWVOLTAGEFUSES ............................................................................................................................. 42
7.0 AUXILIARY L.V. EQUIPMENT............................................................................................................ 44
7.1 GENERAL REQUIREMENTS FOR INSTRUMENTS ........................................................................................ 44
7.2 CURRENTTRANSFORMERS...................................................................................................................... 45
7.3 VOLTAGETRANSFORMERS...................................................................................................................... 45
8.0 CABLES AND SMALL WIRINGS......................................................................................................... 46
8.1 MAINS CABLES ....................................................................................................................................... 46
8.2 PVC, POLYTHENE, XLPE, EPR AND LSF INSULATED CABLES............................................................... 46
8.3 CABLEINSTALLATIONS ........................................................................................................................... 47
8.4 CABLES INSTALLED ABOVE GROUND..................................................................................................... 47
8.5 IDENTIFICATION OF CABLES ................................................................................................................... 49
8.6 SMALL WIRING ....................................................................................................................................... 49
9.0 CONDUIT, TRUNKING AND CABLE TRAY ................................................................................,.... 52
9.1 GENERAL REQUIREMENTS FOR CONDUIT ................................................................................................ 52
9.2 METAL CONDUIT ....................................................................................•......,........................................ 52
9.3 PVC CONDUIT ........................................................................................................................................ 55
9.4 GENERAL REQUIREMENTS FOR TRUNKING.............................................................................................. 56
9.5 METAL TRUNKING ..............................................................•................................................................... 57
9.6 CABLE TRAY ........................................................................................................................................... 58
10.0 WIRING ACCESSORIES................................................................................................................... 60
10.1 GENERAL REQUIREMENTS ...................................................................................................................... 60
10.2 JUNCTION BOXES .................................................................................................................................... 60
10.3 CABLE OUTLET UNITS ............................................................................................................................ 60
11.0 LOW VOLTAGE MOTORS............................................................................................................... 62
11.1 GENERAL REQUIREMENTS ........................................•........................·····...·····...............................········· 62
11.2 ELECTRICAL CONSTRUCTION .........................:........................................................................................ 62
11.3 MOTOR CONSTRUCTION.......................................................................................................................... 65
Z54977 ·PLUMBING AND DRAINAGE INSTALLATION
PARTZ
PD/24

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On Lot No. KIL 1990
12.0 LOW VOLTAGE MOTOR STARTERS AND CONTROL GEAR................................................ 67
12.1 GENERAL REQUIREMENTS ...................................................................................................................... 67
12.2 CLASSIFICATION OF ASSEMBLIES ............................................................................................................ 67
12.3 ELECTRICAL CONSTRUCTION .................................................................................................................. 67
12.4 STARTING SYSTEMS ................................................................................................................................ 67
12.5 PROTECTION AND ISOLATION .................................................................................................................. 69
12.6 CONTROLS .............................................................................................................................................. 71
12.7 COMPONENTS.......................................................................................................................................... 74
12.8 MARKJNG AND LABELING ....................................................................................................................... 75
13.0 NOISE AND VIBRATION.................................................................................................................. 76
13.1 SERVICE PENETRATIONS THROUGH BUILDING FABRIC ........................................................................... 76
13.2 VIBRATION ISOLATION SYSTEM SELECTION ........................................................................................... 76
13.3 UNSYMMETRICAL LOADING OF ANTIVIBRATION MOUNTS IN AVIBRATION ISOLATION SYSTEM............ 76
13 .4 STATIC AND DYNAMIC FORCES DUE TO FLUID PRESSURE AT FLEXIBLE CONNECTIONS TO PUMPS......... 77
13.5 PREVENTION OF OVERLOADING OF VIBRATION ISOLATORS OR EQUIPMENT CONNECTIONS ................... 77
13.6 PIPE SUPPORTS ADJACENT TO PUMPS AND OTHER EQUIPMENT .............................................................. 77
13.7 FLEXIBLE CONNECTIONS FOR PIPEWORK................................................................................................ 79
13.8 FLEXIBLE ELECTRICAL CONNECTIONS .................................................................................................... 79
13.9 ANTI·VIBRATION EQUIPMENT SELECTION .............................................................................................. 79
13.10 LEVELING AND HEIGHT ADJUSTMENT OF VIBRATION ISOLATORS .......................................................... 79
13.11 LATERAL STIFFNESS OF ISOLATORS ........................................................................................................ 80
13.12 SPRING TYPE VIBRATION ISOLATORS ..................................................................................................... 80
13.13 RUBBER, NEOPRENE, GLASS FIBRE (OR SIMILAR MATERIAL) 'IN SHEAR' TYPE VIBRATION ISOLATORS. 80
13.14 'PAD' OR 'MAT' TYPE MOUNTINGS........................................................................................................... 80
13.15 PIPE HANGERS ........................................................................................................................................ 81
13.16 INERTIA BASES........................................................................................................................................ 81
13.I 7 REINFORCED FLEXIBLE PIPE CONNECTORS USED FOR VIBRATION ISOLATION ....................................... 82
13.18 EXPANSION JOINTS USED FOR VIBRATION ISOLATION IN PIPEWORK ...................................................... 82
14.0 SERVICE IDENTIFICATION ...........................................................................................................83
14.1 PIPEWORK IDENTIFICATION..................................................................................................................... 83
14.2 VALVE IDENTIFICATION .......................................................................................................................... 83
14.3 LABELS ................................................................................................................................................... 83
15.0 PAINTING............................................................................................................................................ 85
15.1 GENERAL ................................................................................................................................................ 85
15.2 FERROUS SURFACES................................................................................................................................ 85
15.3 COPPER SURFACES.................................................................................................................................. 85
16.0 INSTRUMENTATION........................................................................................................................87
16.1 PRESSURE GAUGES ................................................................................................................................. 87
16.2 THERMOMETERS ..................................................................................................................................... 87
16.3 WATER CONSUMPTION METERS (NoT USED) ......................................................................................... 88
16.4 WATER LEVEL SWITCHES ....................................................................................................................... 88
16.5 PIPEWORK PRESSURE SWITCHES ............................................................................................................. 88
16.6 WATER FLOW SWITCHES ........................................................................................................................ 88
17.0 CONTROLS EQUIPMENT................................................................................................................89
17.1 CONTROLS- GENERAL ........................................................................................................................... 89
17.2 ELECTRIC MODULATING PRESSURE DETECTORS .................................................................................... 89
17.3 ELECTRIC CONTROLLERS ........................................................................................................................ 90
17.4 ELECTRIC ACTUATORS............................................................................................................................ 90
18.0 WATER STORAGE TANKS AND OTHERS .................................................................................. 92
18.1 FIBREGLASS WATER TANKS ................................................................................................................... 92
18.2 ULTRAVIOLET STERILIZER ...................................................................................................................... 92
PART2
PD/25

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On Lot No. KIL 1990
18.3 REINFORCEDCONCRETBTANK ............................................................................................................... 93
DOMESTIC SUJI.CONTRACT
L PART2
PD/26

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(
On Lot No. KIL 1990
JOB NO. 254977
1.0 PUMPS
1.1 Centrifugai/Vertical Multi-Stage/Booster Pumps
Pumps shall consist of:
i) casing,
ii) impeller,
iii) suction and discharge connections,
iv) driven shaft,
v) couplings,
vi) motor,
Pumps shall be complete with all necessary water seals.
Installations shall comprise:
i)
ii)
iii)
iv)
v)
suction and discharge pipe reducers
expansion pieces directly connected to the pipe connections
vibration isolation equipment
gland drain and tail pipes arranged to discharge into an open tundish adjacent to the
pump base
support brackets or plinths.
The motor terminal box shall be suitable for connection with flexible conduit.
Pumps, component items, and supplementary assemblies shall be entirely suitable for the
systems pressures and temperatures listed in the Equipment Schedule.
Pump duties and details shall be as listed on the Equipment Schedule. Valves shall be
provided on suction and discharge. Strainers shall be fitted on the inlet unless otherwise
indicated.
Where applicable, pumps shall be to:
i) BSEN1151
ii) BS 4082 : Parts I and 2
iii) BS 5257
iv) BS EN 60335-2-51
Pump duties shall be achieved with the impeller shaft speed not exceeding 24rev/s (1450rpm)
unless otherwise listed.
Pump connections shall be screwed to BS 21 up to ON 50 and flanged to BSEN1092, PN 16
for ON 65 and above.
Pump suction and discharge flanges shall be drilled and tapped for pressure gauge
connections. Closing plugs shall be supplied
Pump casings shall have drain plugs fitted at the lowest point and air-vent at the highest point.
Direction ofrotation shall be indicated.
PLUMBING AND DRAINAGE INSTALLATION
PART2
PD/27
2/1

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On Lot No. KIL 1990
JOB NO. 254977
Pumps for floor mounting shall be set on a minimum 300mm high prepared base, incorporating
anti-vibration material.
All drive connections between motors and pumps shall be fully protected against accidental
contact. Provision shall be made for shaft speed measurement.
Electrical connections to drive motors shall be installed in flexible conduit.
Unless specifically indicated elsewhere in this Specification motor enclosures shall be Totally
Enclosed Fan Cooled. Motors shall be provided with anti-condensation heater. End suction
pumps shall be of the back pull-out type enabling the motor, drive and impeller to be withdrawn
from service without distarbing the volute casing connection, piping, etc.
Where pumps are to be coupled to their prime mover on site, the motor and pump shall be
carefully levelled on shims and packing to achieve a close order of aligmnent. Dial gauges
shall be used to achieve this end and the maximum permitted eccentricity shall be O.OSmm.
No pump load shall be imposed on the connecting pipework.
Generally, materials used for construction shall be as follows unless otherwise specified in the
Equipment Schedules:
Fresh Water Pumps (for potable application)
i. Cast pump casings stainless steel 316
ii. Impellers stainless steel 316
iii. Shafts stainless steel 316
iv. Sleeves stainless steel 316
v. Staffing box housing Gunmetal
vi. Glands Bronze
vii. Lantern ring : Bronze
Fresh Water Pumps (for Non-potable application)
i. Cast pump casings
ii. Impellers
iii. Shafts
IV. Sleeves
v. Staffing box housing
vi. Glands
vii. Lantern ring
Flushing Water Pumps ·
i. Cast pump casings
ii. Impellers
iii. Shafts
iv. Sleeves
v. Staffing box housing
vi. Glands
Cast iron
Zinc free bronze
Carbon steel
stainless steel 316
: Cast iron
Carbon steel
: Bronze
stainless steel 316
stainless steel316
stainless steel 316
stainless steel 316
Cast iron
Carbon steel
PART2
PD/28
212

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On Lot No. KIL 1990
vii. Lantern ring
JOB NO. 254977
Bronze
The permissible service pressure of cast iron pump casings shall be generally in accordance
with the manufacturer's recommendations. No pump part or component part shall be subjected
to a gauge pressure in excess of 16 bar, except where specifically listed in the Equipment
Schedule.
Impellers and couplings shall be keyed to the drive shaft, the impeller being retained by a
hexagonal nut. Shafts shall be fitted with water deflectors. Drive shaft couplings shall be faced
with a reinforced composition rubber to minimize the effect ofmis-alignment.
PART2
PD/29
2/3

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On Lot No. KIL 1990
JOB NO. 254977
1.2 In-line Pumps (not used)
1.3 Drainage Sump Pumps
Drainage sump pump shall be of the centrifugal submersible type. Tbe pump is to be so
designed that it can be removed from the sump without the need to drain the sump or enter the
sump to disconnect the pipework.
Facilities shall be provided for raising and lowering the pump, and the discharge pipe
connection shall be automatic.
Pump casing shall be of close grained cast iron, with impeller of cast iron. Shaft sleeves shall
be of zinc free bronze, and shaft sleeves shall be of zinc free bronze, and shaft of stainless
steel SS316.
Coupling between the pump and motor shall be y means of double mechanical seals. The seal
should be enclosed in an oil fill chamber for dissipation ofheat.
Pump impeller and water chute shall be of non-clog type and be so designed that it can pump
out soil or waste water contain solid up to 65mm diameter and high viscosity sludge.
Pump rating greater than 3.7 kW shall incorporate with thermal protection devices to protect
the motor from over heating.
1.4 Pneumatic Vessels
The pressure vessels shall be mild steel to BS5276-4 and internally coated with epoxy resin or
approved corrosion protection lining. The casing ofvessel shall also be externally coated.
The vessels shall be pre-charged with nitrogen at factory at a pressure to suit the systems. The
pre-charge pressure shall be adjustable and a charging port with non-return devices shall be
provided in each vessel.
The water space shall be separated from the air space with a heavy-duty bladder type
diaphragm. A schrader valve shall be fitted to the air side of each vessel for pre-pressure
adjustment.
All materials used for the construction of the pressure vessel shall meet with the Water
Authority requirements. A test certificate for pressure vessel to meet the relevant authorities'
requirement is required.
1.5 Water Hammer Arrester
Water hammer arrester for use with water supply system shall be:
With type 'K' hard drawn copper body and brass piton for use in potable water supply
system.
With Type 316 stainless steel body and seawater corrosion resisting alloy piston for use
PART2
PD/30
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C_
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On Lot No. KIL 1990
JOB NO. 254977
in flush water supply system.
Water hammer arresters for use with pump discharge pipe/pump riser/pressure reducing valve
set shall be:
Constructed entirely of non-corrosive stainless steel for use in potable water supply
system.
Constructed entirely ofType 316 stainless for use in flush water supply system.
Ofbuilt-in expansion bellow type and pre-charged with nitrogen and factory sealed.
PART2
PD/31
2/5

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On Lot No. KIL 1990
JOB NO. 254977
1.6 Variable Frequency Drive (VFD)
VFD Mounting/Enclosure Configuration
All VFD panels should be provided with factory supplied IP54 enclosures.
Heat sink of the VFD shall be of 'exposed to ambient' design for effective ventilation, and
should include built-in ventilation fan for effective air-cooling.
For VFD of IP54 protection, the whole panel should be of integral cabinet, and to be provided
by the VFD supplier. The door of the integral panel shall include.
i)
ii)
iii)
iv)
v)
vi)
Isolator.
Manual speed control potentiometer.
One three-position mode selector switch for Auto/Off/manual selection.
A "power on" lamp
A "motor running" lamp
A "VFD fault" lamp
For application requiring by-pass function upon maintenance or failure of the inverter, the
whole by-pass circuitry will use solid state starter (Soft Starter), and shall be housed in the
integral panel. The VFD manufacturer shall design the whole control circuitry.
Description
The VFD must be an industrial product, which can be designed for plumbing application.
The manufacturers must have a minimum of 10 years experience specializing in the design
and manufacturing of PWM Variable Frequency Drive.
The manufacturing plant must be certified to ISO 9001/9002 & BS5750 part 1 & 2
VFD must be designed to conform to the requirements ofiEC146, IEC801 and EN/CE. VFD
shall be designed to meet UL508C, CAN/CSA-C22 No. 14-Ml9, as well as Safety standard
NEMA ICS 3.1 and Enclosures standard NEMA 250
VFD is an IGBT design with "Sine-coded PWM" technology, which provides a quality output
sine waveform without causing additional heating effect on motor winding.
The VFD must be available in voltage ranges of 380VAC to 480VAC, three phases +/- 10%
and be self-adaptable within its individual voltage range.
The VFD must have the following operation characteristics: -
i) Input voltage: 380V AC, +/-10%, 3 phase
ii) Frequency Tolerance : 48-52Hz
iii) Output voltage range: 0 to rated voltage
iv) Output Frequency range: 0 to 400 Hz
PART2
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On Lot No. KIL 1990
JOB NO. 254977
v) Intennittent overload: 150% rated current for 1 minute
vi) Power Factor: between 1.0 & 0.95 over entire operating speed range
vii) Frequency regulation:
Analog input- within+/- 0.4% ofmax. output freq.
Digital input- within+/- 0.01% of set freq.
viii)Efficiency: min. 97.5 at I00% load and min. 95 at 50% load
ix) Working Ambient Temp: 0 to 50 C for IPOO chassis
x) Relative Humidity: 0 to 95 %, non-condensing
xi) Storage Temp: -40 to 70 C
xii) Full load current: VFD must be worked with motor within nameplate
xiii)current rating
xiv)DC boost: output starting torque can be controlled by automatic DC boost to provide
optimum motor perfonnance without causing the damage to the motor plant.
The VFD must work hannony with any IEC/BS standard motors and shall not cause
motor temperature to rise above class B at loading operation point.
The VFD must be capable of power loss ride through up to 250 millisecond with 50% dip
voltage at full load output and the control logic ride through up to 2 seconds in duration.
The VFD must have auto-toning capability in order to get the optimum motor starting and
running torque production.
The VFD must be capable of detecting loss of input power phase in order to prevent drive
"over current" due to inadvertent loss of phase.
The VFD must be capable of detecting operating motor shaft or V-belt broken, it must
provided a selectable warning indication or fault tripping operation for appropriate
corrective action.
The VFD must built-in the following protective functions as standard: -
i) Protection against line under voltage
ii) Protection against line over voltage
iii) Protection against ground fault
iv) Protection against VFD/ motor over current
v) Protection against VFD Heat-sink over-temperature
The VFD must provide a selectable set-point for drive heat sink temperature. When the
heat sink temperatnre is approaching to the selected set-point, an indication must be
provided for appropriate corrective action.
The VFD must contain a built-in meter to determine actual rnn time of drive, such as
Elapsed Time Meter.
PART2
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On Lot No. KIL 1990
JOB NO. 254977
The VFD must be capable of providing 2 individually acceleration and 2 individually
deceleration algorithm, which are commonly known as "Ramp" and "S-curve" And it can
be adjustable from 0 to 3600 seconds in 0.1 second increments.
The VFD must provide display of output current, output voltage, output power, DC bus
voltage, output frequency, heat sink temperature, last fault, torque current, flux current, %
output power and % output current.
The VFD must provide 7 pre-set speeds with fully programmable value from 0.0 Hz to
400.0Hz.
The VFD must provide with 3 adjustable set-points to skip frequencies, which may
produce mechanical resonance. The bandwidth is adjustable from OHz to 15Hz.
VFD Design Requirements
The VFD is composed of PCB boards in module design for easy maintenance. The
damages in any boards will result in replacing that particular defective board only. The
faults in any boards will not damage the BMS interface.
The VFD must be designed with standard built-in DC link filter for limiting the harmonic
voltage distortion to within negligible %. The harmonic distortion shall meet the
requirements of power utility company.
The VFD must provide up to 250% breakaway/ acceleration torque to move the toughest
loads with ease.
The VFD must provide a rated low speed constant torque at speeds as low as 15rpm,
providing a 120:1 constant torque speed range
The VFD must have a fast flux-up function to aid in acceleration with large motors.
The VFD must have a removable or Snap-in Interface Module with integral display to
show drive operating conditions, operation, and fault code diagnostic information. The
display must be removable under power without causing a drive fault.
PART2
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On Lot No. KJL 1990
JOB NO. 254977
2.0 PIPEWORKAND ACCESSORIES
2.1 General
a) General Requirement
Each part of the piping system shall be complete, provided with all isolating, regulating and
control valves and accessories necessary for satisfactory commissioning, operation and
maintenance.
Corroded pipes shall not be used. Dirt and foreigo matter shall be excluded from pipes by the
use of screwed iron end caps, plugs or rigid plastic covers. A valve fitted to the open end of a
disconnected pipe is not acceptable for pipe sealing.
Pipes shall be reamed after cutting and shall be free from burrs, rust scale and other defects
and shall be thoroughly cleaned before erection.
All bends shall be long radius, and all tees swept pattern unless this precludes natural venting
of pipework. Sets, double sets and springs shall be formed from long lengths of tube using as
large a radius as practicable, and shall be free from evidence ofbuckling.
All piping shall be grouped wherever practicable and erected to present a neat appearance.
Pipes shall be installed parallel to each other and parallel or at right angles to building
surfaces.
All rising and dropping pipes shall be troly vertical. No joints shall be formed within wall,
floor or ceiling thickness, nor in inaccessible positions.
Multiple pipe runs shall be fixed in such a manner that subsequent access to any pipe is
possible without disturbing other pipes, and without interference with the installation of
equipment, ducts or other piping systems, and will not restrict future maintenance.
Piping requiring to be thermally insulated or otherwise covered shall be so fixed as to permit
the application of the covering around the full circumference and also to leave 25mm
minimum between covered pipes.
All reductions in bore of vertical pipework shall be made with concentric reducing fittings.
Reductions in bore of horizontal pipework shall be made with eccentric reducing fittings and,
in piping laid to falls, shall be used to maintain a lineable invert laid to falls.
Unions or flanged joints shall be used to join adjacent lengths of pipe where it is not possible
to rotate either length. They shall also be used for joints at equipment and apparatus items
and additionally at 18m intervals to permit ease of installation, dismantling and refixing. The
use ofbushes is not permitted.
All pipes and pipe fittings shall be carefully examined before fixing, any which are defective
shall be rejected. Damage to coatings shall be made good or recoated.
Jointing rings, couplings and adaptors, shall be of types recommended by the manufacturer of
the pipes being jointed. Rubber joint rings shall be to relevant sections of BS EN681-1 and
BS 2494 : Part 2 and shall be stored in their delivery bags and not exposed to sunlight.
PART2
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On Lot No. KIL 1990
JOB NO. 254977
Particular care shall be taken that all pipework is erected and secured truly parallel and plumb
with vertical surfaces. All horizontal pipework shall be arranged with a minimum fall or rise
in the case of anti-syphon pipework.
Long straight runs of pipework shall be erected so that stresses of expansion and contraction,
due to temperature variation, are taken up by expansion joints of pipework. Where pipework
passes through building expansion joints, expansion joints ofpipework shall be provided.
Where expansion devices are used they shall be of similar material to the pipe, installed in
line with the axis of the pipe and shall be free from compression, tension or torsion. The
female member of the expansion devices shall be firmly anchored to allow the male member
to take all movement.
Where pipes pass through walls and floors, sleeves shall be fitted to allow free axial
movement of the pipes. Sleeves shall be of a material compatible with the pipes they protect,
non-combustible and of a minimum bore to allow such movement. The length of sleeve shall
be sufficient to protrude !Omm from the finished wall or, where passing through floors to
protrude 25mm above and below the finished floor and underside level (soffit). The annular
space between pipe and sleeve shall be packed with approved fire resisting material and then
caulked with 20 mmdeep silicone or polysulphide sealant at both ends.
Slip-on chromium plated cover plates shall be provided as a finish to pipe work, up to and
including 50 mm diameter, emerging from a wall in occupied areas other than plant rooms
and service voids. Samples shall be first submitted to the Employer's Representative for
approval.
Joints in pipework shall not be made within the thickness of walls, floor or roof, or where
they would later be built in.
Jointing material shall not project into the bore of pipes, fitting or appliances.
Access plates shall be fitted at the foot ofeach vertical stack and at every beod and junction to
enable the complete system to be internally cleaned and rodded.
During the construction stage, all pipework shall be well protected by the Contractor.
At the penetration of all roof levels a suitable detail of providing a water seal and weathering
shall be submitted to the Employer's Representative for approval prior to installation.
Soil, waste and vent stacks shall be extended above the highest branch and above roof level to
such a height so as to allow the safe outlet of foul air. The stacks shall not reduce in diameter
and shall be fitted with a balloon or vent cowl.
On cast iron or galvanized stacks, balloons shall be of copper wire to the requirements of BS
416.
The Contractor shall provide special fittings for all dissimilar metal joints to prevent
electrolytic connections with insulating gaskets plus insulating sleeves for the flange bolts
shall be provided.
All pipework within the fire protected areas shall be enclosed to meet the FSD's requirement.
DOMESTIC SUB·CONTRACT
PART2
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On Lot No. KIL 1990
JOB NO. 254977
b) Quality Assurance
I. Pipework installers shall have had a minimum of three years experience in their trade.
II. All pipework supplied for this project shall conform to the relevant British Standard
and EN specification or the ASTM, JIS, DIN, lOS, Australia Standard or approved
equivalent.
III. Submit certification that the pipework supplied is in confonnance with the standards
set out above.
N. All personnel engaged on welding operations must possess a certificate of
competence issued by an approved Authorities.
v. All pipework shall be supplied by manufacturer experienced in the design and
construction of similar equipment for at least five years. All pipework shall be
manufactured under a Quality Assurance Scheme conforming to ISO or other
recongnised Quality Assurance Sheme.
2.2 Black Mild Steel Pipework
Pipe up to DN !50 shall be to BS 1387. Pipe DN 200 to DN 450 shall be to BS 360I and be
of hot finished electric resistance welded construction from steel with minimum tensile
strength of 360N/mm', unless noted to be seamless. Pipe over DN 450 shall be to BS 3602
and be of submerged arc-welded construction from steel with minimum tensile strength of
41 ON/mm'. All pipes shall have thickness as specified in the pipework schedule.
Joints on pipework up to and including DN50 shall be screwed to BS21. Longscrew
connectors shall not be used. Joints on pipework over DN50 shall be of welded construction.
All welded joints shall be of the butt type except where flanges are necessary for connection
to flanged fittings and equipment or where pairs of mating flanges are shown on the Tender
Drawings and additionally at intervals not exceeding 18m to permit ease of installation,
dismantling and refixing.
2.3 Galvanized Mild Steel Pipework
Pipes up to and including DN !50 shall conform to BS 1387. Pipes of DN 200 to DN 450
shall be to BS 3601 (or EN 10216) of ERW hot finish or seamless construction. Pipes over
DN 450 shall be to BS 3602 (or ENI0217) and be of submerged arc-welded construction
from steel having a minimum tensile strength of 41 ON/mm'. All pipes shall have thickness as
specified in the pipework schedule and shall have galvanised finish.
Joints on pipework up to and including DN 50 shall be screw threaded to BS 21 and fittings
shall be beaded type, hot dipped galvanized finish, to BS 143 & 1256. Long screw
connectors shall not be used.
Joints on pipework DN 65 to DN 150 shall be made with screwed flanges and heavy quality
galvanized flanged fittings to BS 143 & 1256. Exposed threads on pipe shall be painted with
'cold galvanizing' solution.
PART2
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On Lot No. KIL 1990
JOB NO. 254977
Pipework ON 200 and above shall be fabricated in black mild steel using butt welding fittings
to BSEN10253-l, to the same outside diameter and pressure rating as the pipe with flanges
welded on to pipe sections and fittings. Pipe sections shall be of suitable length for hot dip
galvanizing.
Flanged joints shall be made with H-R-H hot dipped spun galvanized nuts, bolts and washers
of correct length for the joint.
Care must be exercised at all locations where copper and galvanized steel pipework are to be
connected together. In such positions a separation of dielectric material shall be used to
prevent electrolytic action taking place.
Galvanized mild steel pipework may be jointed by use of mechanical rolled grooved end pipe
with couplings for temperatores not in excess of 82 ' C.
Where sections of pipework and fittings are site fabricated, black pipe and fittings shall be
used, assemblies being retomed to works for galvanizing after manufacture to the listed
standard.
Piping to be galvanized shall be thoroughly descaled, washed as necessary, and immersed in a
bath of molten zinc (zinc content not less than 98.5% by weight) at a temperatore suitable to
produce a complete and uniformly adherent coating of zinc. Galvanizing shall be to BS1387,
Appendix A- Copper Sulphate Test.
2.4 Copper Pipework
Copper tobe up to 159mm size shall be to BS EN 1057, Table 3. Table Y tobe shall only be
used for instrument or gauge connections. All copper tobe shall be BS kite-marked.
Bends, springs and sets in Table 3 tobe up to and including 42mm size may be site made
where standard fittings cannot be used, or where this method will give a neater appearance.
Pulled bends or offsets which show flattening, ripples or constriction ofbore, will be rtjected.
Copper tobe and fittings of size 54mm and below shall be jointed by use of capillary joints
with integral solder rings. All fittings shall be to BSEN254 and material resistant to
dezincification shall be used.
When using capillary type fittings the inside surface of the fitting and the outside of the pipe
shall be thoroughly cleaned and coated with a suitable flux. Heat shall be applied uniformly
around the fittings using two or more heat sources if necessary for larger diameter pipes.
Unless stated elsewhere in the Specification, the solder used in capillary joints shall be 90-10
tin/copper solder. All joints shall have a good seal of solder around the complete
circumference of the joint. Surplus flux and solder shall be cleaned off to give a thoroughly
clean installation. All flux used shall be ofthe ammonia free type.
Lead-free soldering alloys and cadmium-free brazing alloy shall be used in installations for
water for human consumption and shall fully comply with the requirements of WSD and this
section. Supporting document of lead-free grade and /or cadmium-free grade soldering
materials and filler metal used in soldering/brazing shall be provided.
PART2
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On Lot No. KIL 1990
JOB NO. 254977
Jointing of copper tube and fittings of size 67mm and above shall be by use of silver brazing
to BSEN14324, BSEN12797 and BSEN12799. Fittings for brazing to BSEN1254 shall have
socket ends for brazing with silver filler to BSEN1044.
Brazing alloys for copper and copper alloy capillary fittings shall comply with Table 6 in
Section VI of BS EN 1254-1: 1998. Chemical compositions of brazing alloy shall comply
with Table 7 of BS EN ISO 17672:2010 with 2% nominal silver content and shall be of
cadmium-free. These brazing alloys should never be used on copper alloys containing nickel.
Flux shall not be used for brazing copper-to-copper joints. For joints other than copper-to-
copper, type offlux recommended by the brazing alloy manufacturer shall be used.
Unions, copper to iron adaptors or flanged connections shall be used, wherever it is required
to connect threaded pipe to copper tubes or when making up copper pipes to valves,
equipment etc.
Pressure rating and services conditions for fittings shall be equal to the specified tube.
Fittings incorporating screwed threads to BS 21 shall be made up by using jointing
compounds to BS 6956 or PTFE tape.
Care must be exercised at any points of junction between copper tube and galvanized steel
pipe. A separation dielectric shall be interposed between the materials to prevent direct
contact and subsequent electrolytic action taking place.
Where copper pipework is required to be chromium plated such pipework shall be sent to a
specialist for plating after all pulled bends and soldered joints are completed.
PART2
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On Lot No. KIL 1990
JOB NO. 254977
2.5 PVC Pipework
For plumbing system, thennoplastic pipework and fittings shall be uPVC pipe and fittings for
pressure purposes to BSEN1452 (or BS3505 Class E) and BS4346 respectively. Flanges for
use with thennoplastic pipes shall be stub type to BS4346: Part 2 for uPVC with galvanized
steel backing rings. Joints between stub flanges and pipes shall be solvent welded.
For drainage system serving soil, waste and rain water drainage systems, uPVC pipe up to
lSOmm size shall be BSEN1455-l/BS4514 and uPVC fitting shall be injected moulded type
to BS4514 with solvent welded joint to BS4346-l using solvent cement to BS4346-3.
For A/C condensate drain system used at external areas, uPVC pipe shall be BSEN1452 PNlO
and uPVC fitting shall be injected moulded type to BS4514 with solvent welded joint to
BS4346-l using solvent cement to BS4346-3.
Pipe shall be indelibly marked at intervals of 3m maximum to show:
(i) Manufacturer's identification,
(ii) BS standard as applicable,
(iii) the symbol 'PVC',
(iv) nominal size and class.
Letters shall be fully legible and not less than 5mm high.
Adhesive identification labels will not be acceptable.
Thennoplastic pipe and fittings shall be obtained from one manufacturer only. Materials
from a variety ofsources shall not be intennixed.
Each part of the piping systems shall be complete in every detail and provided with all control
valves and accessories necessary for satisfactory operation.
All bends and tees shall be easy sweep. Reduced bore branch connection shall be made by
drilling and solvent welding of saddle and spigot branch connections. Joints shall be made
with solvent cement as supplied by the manufacturer.
Thennoplastic pipe connections to pipework of other materials shall be made with the correct
adaptors.
Solvent welded joints to pipework and fittings shall be made in accordance with printed
instructions of the fitting manufacturer. Joints shall be cleaned of all surplus cement
immediately after setting.
The threaded ends of uPVC fittings shall be jointed with PTFE tape only.
uPVC socket unions shall incorporate flexible '0' ring seals.
Test pressure shall not be applied sooner than twelve hours after completion ofjointing, and
full rated pressure not less than twenty-four hours after completion ofjointing.
DOMESTIC SUU.CONTRACT
PART2
PD/40
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