Spec Drain

8/15/2019 Spec Drain

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SECTION – 20

DRAINAGE INSTALLATION


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DEVELOPMENT OF INTERNAL SECURITY FORCE (ISF) CAMP AT AL DUHAILCPC-07b BUILDINGS

ELECTRICAL AND MECHANICAL SPECIFICATIONS

SECTION 20

AEB-727-08 -REV.00 S-20-1/28DRAINAGE INSTALLATION

SL NO. TITLE OF SPECIFICATION

20.1.00 DRAINAGE GENERAL

20.1.01 Site

20.1.02 Site Conditions

20.1.03 Definitions

20.1.04 Scope of Works

20.1.05 Compliance with Specifications and Regulations

20.1.06 Drainage System

20.1.07 Programme

20.1.08 Contract Drawings

20.1.09 Working Drawings

20.1.10 Co-ordination of Drawings

20.1.11 Material Submittals

20.1.12 Materials Inspection

20.1.13 Alternative Materials

20.1.14 Setting Out of Works

20.1.15 Safety

20.1.16 Contractor’s License

20.1.17 Permits

20.1.18 Damage to Plant and Materials

20.1.19 Protective Finishes

20.1.20 Works Test and Inspection

20.1.21 Operation and Maintenance Manuals

20.1.22 As Built Drawings

20.1.23 Period of Maintenance


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SECTION 20


20.2.00 DRAINAGE SYSTEM NETWORK

20.2.01 Pipes and Fittings

20.2.02 Above Ground Pipes

20.2.03 Below Ground Pipes

20.2.03.1 External Sewage Pipes

20.2.04 Rain Water System Pipes

20.2.05 Pipes and Fittings, Installation and Inspection

20.2.06 Manholes

20.2.07 Manhole Covers and Gully Gratings

20.2.08 Oil Interceptors

20.2.09 Protection of Drainage Pipes

20.2.10 Testing and Commissioning


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SECTION 20


20.1.00 GENERAL

20.1.01 SITE

For Site Location, refer to the Project Specifications.

20.1.02 SITE CONDITIONS

Unless otherwise specified, all the Drainage Materials & Equipments shall be capableof withstanding the following site conditions:

1. Maximum Ambient : 50 Deg ºC (Dry Bulb) in Summer& 8 Deg ºC (Dry Bulb) in winter

2. Altitude : Sea Level

3. Maximum Relative Humidity : 95 %

4. Maximum Wind Velocity : 140 Km. per Hour

5. Prevailing Wind : North and North Westerly

6. Storms : Dusty Sporadic and Irregular

7. Annual Rainfall : 50 mm between January & April

20.1.03 DEFINITIONS

The following terms and abbreviations used in these specifications / drawings shallmean:

Site : The Locations where the works are to be carried out.

KAHRAMAA : Qatar general electricity and water corperation

KAHRAMAA Regulations :Regulations issued by the KAHRAMAA regarding the

installation of Electrical equipment, Wiring & Air-conditioning of residential and commercial Buildings.

BS : British Standard Specifications

CP : British Standard Code of Practice

Tender Drawing : The Drawing on which the tender is based and theschedules therein.

Working Drawings : The Drawings prepared by the Contractor for thepurpose of execution of work at site.


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SECTION 20


As Built Drawings : This is the true record of the actual work carried out atsite.

Works : To include the provisions for al the materials and worksto be carried out by the contractor as per thesespecifications and for the satisfactory completion of theinstallation.

Approved : Shall mean APPROVED by the consultant in writing.

Submitted : Shall mean SUBMITTED to the Consultant in writing.

Accepted : Shall mean ACCEPTED by the Consultant in writing.

Provide : Shall mean, supply, install, test and commission.

Install : Shall mean install, test and commission.

Furnish : Shall mean supply only.

Concealed : Shall mean hidden from normal sight in the shafts,ceiling spaces, walls, slabs or partitions.

20.1.04 SCOPE OF WORKS

The scope of works consists of furnishing, installing, commissioning and testing thecomplete foul, waste and storm water drainage systems along with all associatedmanholes as indicated on the contract drawings, and in accordance with thisspecification and the requirements of section 20 of the latest edition of QCS and shallbe installed to BS 8301:1985.

The contractor shall provide all supervision, labor, materials, equipment, machinery,and any other items necessary to complete the systems in all respects.

The drainage system shall include the following:

1. Soil, waste, vent, rainwater pipes as shown on drawing and specified

elsewhere.2. Floor drains, floor gulleys, gully traps, overflows, bottle traps as shown on

drawings and specification3. Manhole, Manhole Covers, Gully Grating, & Steps.

20.1.05 COMPLIANCE WITH SPECIFICATION AND REGULATIONS

Project specification to be followed as applicable and shall also to comply to thelatest editon of QCS.

All materials used shall be as per approved materials, any changes shall have a

written approval by the Engineer.


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SECTION 20


The installation of the works covered in this section shall be in accordance with thisspecification and with the requirements of the relevant authorities, State of QatarPublic work authority Drainage affairs and to the relevant B.S specification.

i. The equipment shall conform to the British Standard specifications & codes ofpractice (current editions including all amendments)

ii. It is the responsibility of contractor to study the specification in detail and clear alldoubts or issues that need clarification in order to execute the job. The tenderdrawings are guide lines and the contractor must prepare the detailed shopdrawings and get approval from consultant prior to the execution of job at the site,No delay or any compromise on the specification or quality of work is accepted onany account.

Any apparatus, appliance, material or work not shown on the contract drawings butmentioned in the specification or vice versa, or any incidental accessories or worknecessary to make the work complete and perfect in all respects and ready foroperation, even if not particularly specified shall be supplied and installed or carriedout by the contractor without any additional costs.

Applicable Standards:

1. All Local Codes2. National Standard Plumbing Code3. NSF National Sanitation Foundation

4. PDI Plumbing and Drainage Institute5. ASSE (American sociaty of safety engineers)

20.1.06 DRAINAGE SYSTEM

The Drainage system includes pipe works including all the necessary fittings andfixtures for the safe disposal of Soil, Waste, and Rain Water from the project site,along with the provisions of various Manholes and Holding tanks, finally connected tothe infrastructure Drainage and Disposal system available in the vicinity.

The scheme for the drainage system is detailed and provided in the Contract

drawings for handling and disposal of:

1. Soil Water2. Waste Water &3. Rain Water

Soil and Waste Water Discharge

Twin pipes system for separate discharge of soil and waste shall be provided asrequired in accordance with the State of Qatar Public Works Authority (Ashghal),Drainage Affair Manual.


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SECTION 20


Drainage will be provided for all sanitary fixtures, sinks, floor drains and parkingareas thorough vented soils and waste risers. Offset venting will be provided in orderto ensure a proper functional system. The drainage system will be divided into a

waste and soil system. The waste system will collect water from sinks, floor drains,etc. The soil system will collect water from toilets and urinals. The soil and wastesystem will be connected directly to the municipality sanitary system.

Storm Water Drainage System

Storm water drainage shall be provided for roof and ground level asphalt areas. Thestorm water run-off generated from the roof of the building shall be discharging freelyto the ground floor level and ground floor parking surface water will be collectedthrough road gulleys and convey to the infra structure storm water network.

20.1.07 PROGRAMME

The Contractor shall produce the work program based on CPM (Critical PathMethod) or Bar chart, indicating the time required for various activities and operationsto complete the project in time. The following points shall be highlighted in theProgram:

1. Mobilization2. Drawings and Material Submittals3. Approvals

4. Equipment Deliveries5. First Fix6. Main and Sub-Main Piping Works7. Second Fix8. Fixing of Accessories9. Testing10. 10.Commissioning and Handing Over

20.1.08 CONTRACT DRAWINGS

The Drainage tender drawings related to this project have been listed in the Schedule

of Drawings enclosed with the specifications. The tender drawings have beenprepared to show the tenderer the principal equipment and general arrangementrequired for the project.

These drawings do not indicate every detail of the work. It is the Contractor’sresponsibility to check the positions / locations at site. All dimensions are tentativeand shall be checked with the Architectural and Structural drawings. Any discrepancyshall be brought to the attention of the consultant in writing at the time of tender.

Particular attention shall be paid to the positioning of Floor Gullies, Drains, and otheraccessories, in relation to the Interior finishes and locations of various appliances.The Contractor is deemed to have studied the services drawings based on all the

local regulations and have included in his prices for all builders work associated withthese drawings.


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SECTION 20


20.1.09 WORKING DRAWINGS

The contractor shall prepare the working drawings in a scale of 1:100 for plans, 1:20

for details and 1:200 for site plan, and submit them for the Consultant’s approval. Thecontractor shall project the following in the above drawings:

1. Actual pipe work routes boxes indicating the sizes of all branches, bends andother accessories and fittings.

2. Typical connection details of the various drainage systems of appliances, likeWater Closets, Wash Basins, Faucets, Bidets, Sinks etc.,

3. Sections and Elevations of Installations with co-ordination details in respectto the other services Installations like, Electrical, Air-conditioning & Ventilation

and Plumbing.

4. Levels, Center Lines and Slopes/Gradients of the pipe work installations.

20.1.10 CO-ORDINATION OF DRAWINGS

The Main contractor shall produce working drawings for building works required forthe services showing the integration of all the services i.e., Electrical, Mechanical,Plumbing and Drainage systems.

The Main contractor should ensure that all the working drawings are properly

coordinated before submitting to the consultant for approval. All the services shall beinstalled in such a manner so as to avoid conflict with each other and maintain theclearances required between each of them as per the prevailing regulations.

20.1.11 MATERIAL SUBMITTALS

The materials offered for approval shall be strictly in accordance with thespecifications and tender drawings.

The contractor shall submit in triplicate, the technical literature for each item of theequipment, he intends to use for the project, to the consultant for the necessary

review and approval.

If in case the technical literature is not available, then a sample shall be submitted: inthe absence of either of these, typed technical data shall be submitted dulysupported by letter of the manufacturer for confirmation.

In case of items involving aesthetic, like Floor Gullies, Floor Clean Outs, Manholecovers ( if located Inside of Building) etc., samples must be submitted for approvalalong with the materials submittals.

Each copy of the submittals shall be numbered and signed with the technicalliterature clearly highlighted, indicating the model, type and capacity of the equipment

offered. The consultant shall retain two for copies and return one, either Approved orNot Approved, to the contractor.


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SECTION 20


The contractor shall maintain and submit a status report every month, of all theMaterials submittals of the Drainage Materials & Equipments in the following performto the consultant:

i. Submittal Numberii. Type of Materialiii. Manufacturer / Local Agentiv. Date of Approvalv. Date of Order / Order Numbervi. Mode of Delivery (Air, Land, or Sea)vii. ETA on Siteviii. Status as on date of Report

a. Equipment Supply

All the equipments for the project shall be procured only through the appointed localagent in Qatar, who shall be the authorized agent and be able to supply the spareparts etc., for the items anytime in the future. The contractor shall mark the sameclearly on the submittals (item No. iii. above).

In case of any item/s required to be purchased abroad directly, for valid reasons,then the contractor shall mention the same in the submittal and obtain approval fromthe consultant specifically.

b. Equipment Size and Delivery

Each item of equipment shall be delivered to site in sections suitable for installationsin position designated, bearing in mind the location, type of structure, constructionprogram and the method of access.

c. Design References

Any design, for any of the systems, detailed on the Tender drawings, which requiresamendment or differs from that available at the time of construction, due to thechange in the manufacturer’s range of production or availability etc., The contractor

shall discuss the matter and obtain a readily available alternative from theConsultant. Accordingly, the contractor shall make a fresh submittal based on theConsultant’s advise and obtain approval to provide the revised system.

In such cases, no cost consideration will be applicable, as the contractor is deemedto have studied the drawings and specifications thoroughly as well as obtainedclarifications during the tender stage, before submitting his quotation for theexecution.


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SECTION 20


20.1.12 MATERIAL INSPECTION

The contractor shall inform the consultant within one week upon receipt of all the

materials at the site and arrange for the inspection of the same. Any material used atsite, which is not approved earlier specifically, shall stand rejected without notice.

Any item on supply differs from the one shown on the submittal catalogue copy or thesample submitted, would also be rejected at site. In such cases, the contractor shallmake a fresh submittal for the item and obtain approval from the Consultant. Anytime delay caused due to the above shall be on the Contractor’s account.

The contractor will have to remove the rejected materials from the site and replacewith approved materials at his own expenses. In the event the contractor fails to doso, the client will have the liberty to carry out such works from other agencies and

debit the ensuing amount to the Contractor.

Materials Storage

The contractor shall be responsible for the safekeeping and storage of the materialsat site and provision of such covering as may be necessary to ensure that oncompletion, all items are handed over in sound condition with all protective finishesundamaged. The material storage, handling, & protection at site shall be strictly asper Q.C.S.

20.1.13 ALTERNATIVE MATERIALS

Equipments and Materials used as the basis for the design are listed in the Scheduleof Manufacturer’s. Only in case if the specified item/s are not available due to validreasons. Only in such cases, the Consultant will consider the alternatives, before thetender is accepted and the Consultant’s decision will be final regarding the matter.

In case the alternatives are accepted, the Consultant will confirm the acceptance ofthe same in writing. During the execution of the contract, no alternative equipment,materials or fittings will be permitted other than the approved and the contractor isfore-warned that any item provided by him which is not up to the specification, mustbe replaced at his own expense. In cases where time will not permit, then such

replacements shall be at the client’s convenience, but at the Contractor’s expensesetc.

20.1.14 SETTING OUT OF WORKS

The location of Floor Drains/Gullies, routes, Manholes etc., as indicated on thetender drawings is tentative and may require some variation to suit the siterequirements. The exact positions must be checked and shown on the detailedworking drawings as indicated on the detailed Architectural drawings and co-coordinated with furnishing and other services.


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SECTION 20


20.1.15 SAFETY

The contractor shall maintain all the safety procedures at site to protect manpower

and machinery. The Main Contractor shall provide all the means to achieve theSafety standards required and protect the manpower, materials and equipments atany point of time.

20.1.16 CONTRACTOR’S LICENSE

The Main contractor shall ensure that the Sub-Contractor appointed for Drainageworks shall be one of the approved to carryout and maintain such work.

The Contractor shall submit the qualifications and experience particulars of the

Mechanical Engineer, Foreman, and technicians (plumbers) to be employed on theproject and obtain approval from the consultant. Once the approval is obtained, thecontractor shall not replace the staff from site. In case the same becomes necessary,re-approval should be obtained and the new staff shall continue with the old staff fora minimum period of 30 days before the later is withdrawn from the site. In suchcases, the proposed replacement personnel shall have a minimum of 5 years localexperience. The consultant will reject any application with less than 5 years ofexperience.

20.1.17 PERMITS

The contractor shall obtain all necessary permits prior to commencement of work andobtain current record drawings of existing services already installed. All applicationsfor permits etc., shall be made in writing to the authorities, a minimum of 7 days priorto the execution of the work. The Contractor is fully responsible for obtaining thenecessary permits from the authorities for his work site as well as for any connectedworks to others.

20.1.18 DAMAGE TO PLANT AND MATERIALS

Any plant or material which is damaged by any means whatsoever, shall not be usedin the works. Should the contractor wish to rectify such damage in order to utilize the

plant or materials in the permanent works, the matter shall be brought to the attentionof the Engineer, who in turn shall conduct a proper survey after which the necessaryinstructions will be issued. Only after obtaining a written permission from theEngineer shall any remedial work be carried out.

Any damaged Plant or Material allegedly brought to a “as-new” condition followingsuch a procedure, shall only be accepted after the technical appraisal & discretion ofthe Consultant, whose decision in such matters shall be final and binding.


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SECTION 20


20.1.19 PROTECTIVE FINISHES

The protective finishes must be provided on all materials and Equipments used in

this contract to ensure that no deterioration is caused by the interaction of localclimatic conditions.

All materials shall be inspected by the contractor or his representative beforeshipment to ensure that finishes are in accordance with the specifications.

20.1.20 WORKS TEST AND INSPECTION

Provision shall be made by the contractor for the Consultant or Consultant’srepresentative to witness hydraulic tests as specified elsewhere, of major pipe work

executed by the contractor.

The Consultant will advise the contractor at the time of commencement of thecontract the list of works that to be inspected and the contractor shall give theConsultant the required notice in the required Inspection form, of the date on whichthe plant will be ready for testing.

The Consultant will signify his intention to attend the tests or accept the contractor'stest sheets. The contractor shall supply all the Inspection Forms and Test certificatesin original to the Consultant / Client at the time of handing over the project.

20.1.21 OPERATION AND MAINTENANCE MANUALS

The contractor shall provide three copies in the form of bound documents theoperating instructions and maintenance manuals indicating the following:

a. Step by step operating procedures.b. Preventive maintenance schedule.c. Technical literature.d. Spare parts liste. Manufacturer's name, address, telex no., Fax no. telephone no., and contact

person. - Local as well as overseas.f. Work test certificates, if any.

g. Routine Test results carried out at site.

20.1.22 AS BUILT DRAWINGS

After the working drawings have been approved, no alteration to the drawings shallbe carried out without the consent of the Engineer. These changes shall besupported by sketches and incorporated on the “AS-BUILT” drawings, which are tobe submitted to the Consultant within one month of completion of the project.

Two sets of drawing CD’s along with three sets of drawings printout shall besubmitted after approval of the Engineer for onward submission to the client.


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20.1.23 PERIOD OF MAINTENANCE

The contractor shall guarantee the entire Drainage System installed against Faulty /

improper materials and or workmanship for the period of maintenance of 400 days(Four Hundred) from the date, the installation is tested, commissioned and acceptedby the Consultant. Also where longer guarantee or warranty periods are otherwisedeclared, for any equipment or materials such longer terms shall apply.

The Contractor shall submit a single guarantee for whole of the works, which statesthat all parts of the work are in accordance with the contract documents during theperiod of maintenance, the contractor shall repair any deficiencies, within 24 hours ofnotification at no additional cost to the contract.

In case if the Contractor fails to attend to any such faults as mentioned above within

the specified time, then the client shall make own arrangements to rectify the faultbut nevertheless at the Contractor’s expense.


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SECTION 20


20.2.00 DRAINAGE SYSTEM NETWORK

20.2.01 PIPES AND FITTINGS

All drainage pipes and fittings shall be manufactured under BS 4514 for Internalabove ground and BS 4660 for the Internal & external under ground installations.

Applicable sub-sections of Section 20 of the latest edition of Qatar ConstructionSpecifications (QCS) shall be applied to all drainage works.

All drainage pipe inside the building shall be (Polypropylene, mineral reinforced) asper EN 12056, DIN 1986-100, low-noise type pipe has a complete sound protectionsystem according to DIN 4109. The sound isolation capacity shall be less than 20dB.

20.2.02 ABOVE GROUND PIPES

Soil, Waste and Overflow Systems

Reference should be made to the following Codes and Standards:

BS 3943 : 1979 Specification for plastic waste trapsBS 4514 : 1983 Unplasticized PVC soil and ventilating pipe fittings and

accessories.BS 5254 : 1976 Polypropylene waste pipe and fittingsBS 5255 : 1976 Plastic waste pipe and fittings

BS 5572 : 1978 Code of Practice for Sanitary pipe work(Formerly CP 304)CP 312 : 1973 Plastic pipe work (Thermoplastic material) Part 1 & 2

The mineral shall be reinforced, UV resistant plastic to the standard HDPE pipes,Use acoustic type pipe brackets for the solid-bourne sound dampening and thesystem should meets current regulations for sound insulation.

The pipe acoustic insulation properties are achieved by using the reinforced HDPEmaterial and the uniquely shaped insulation ribs located on the fittings. Pipe fittingsshall have small ribs to reduce the vibrations and the noise caused by waterimpacting with the pipe.

Socketed fittings shall be solvent-welded with plain-ended pipes. Seal ring expansion joints shall be provided where required.

The system shall be compatible with buried drain system. Weathering Apron(solvent-weld socket) shall be solvent-welded to the soil, waste, vent pipes forweather flashing around pipe at roof.

Adjustable, plastic coated steel holder bats shall be used to support pipes or securefittings. Galvanized mild steel support bracket with packing piece shall be used forhorizontal pipes. Smaller pipes and fittings shall be secured to wall by zinc-platedsteel brackets.


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SECTION 20


FLOOR DRAINS

Floor drains for wash areas (FD).

a. Nickel bronze/stainless steel 150mm x 150mm strainer with multi-inlet PVCfloor drain trap/ gully trap

Floor drains inside toilets(FD-1)

a. Nickel bronze/ stainless steel 150mm x 150mm strainer with PVC floor draintrap/ gully trap

CLEANOUTS

Cleanouts in concrete floor shall be 150x150 mm cover stainless steel cover withgrating and screwed cover plate.

AIR VENT / COWL

The vent cowl for drainage pipe shall be of the same material as the pipe materialand suitable for exposed to weather mounting, vandal proof type. The size of the ventcowl shall be same as per the pipe size but in any case not less than 82 mm dia.

ROOF DRAIN

Roof drain shall have cast iron body, bottom or side outlet as required, multi-weirbarrier with integral clamping device and gravel guard, large protected sump,waterproofing flange, bearing pan, clamping bolts, under deck clamp, extensionframe and metal dome strainer..

20.2.03 BELOW GROUND DRAINAGE PIPES(uPVC Buried Drain System) for pip ing within the building

The uPVC pipes and fittings shall comply with BS EN 1401-1:1998(formerlyBS 4660)and BS EN1401-1:1998(formerly BS 5481), comprising complete drainage system,compatible to soil waste and rainwater system and where appropriate shall bear theKitemark.

Materials and Colours : buried drain system pipes and fittings shall be uPVC withpolypropylene seal retaining caps. Underground fittings shall be coloured goldenbrown, approximately to BS 381 C : number 414. Seal retaining caps and seal ringsare black. Rodding eyes shall be provided where required.

uPVC solvent weld socket seal / lip and lip seal / lip seal shall be used.

Where necessary, lip seal / lip seal slip coupling shall be used.


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SECTION 20


Solvent Cements

Solvent cements should comply with either BS 6209 for non pressure pipework

Sealing Rings

Sealing rings should be made from natural or synthetic rubber complying with BS2494.

20.2.03.1 EXTERNAL SEWAGE PIPES (Virti fied Clay pipes and fitt ings for bur ied drainage system)

Standards

1. Pipes and fittings for foul sewerage and surface water applications shall bemanufactured to BS EN 295.

2. Pipes and fittings for land drainage applications shall be manufactured to BS 65.3. Sealing rings shall be to BS 2494 or ISO 4633.

Manufacture

1. Pipes and fittings shall comply with the following:

a. pipes shall have spigot and socket type joints.b. pipes shall be glazed both internally and externally.c. all pipes shall be free of cracks, blisters, broken ends and other imperfections.d. vitrified clay pipes shall have the minimum strength requirements shown on

Table 3.2

Table 3.2 – Minimum Strength Requirements

Nominal Bore (mm) Min. Crushing Strength (FN)kN/m

Foul / SW(Non-Perforated)

Min. Crushing Strength(FN) kN/m

Land Drains(Perforated)

100 28 28150 28 28

200 40 28

300 60 34

400 64 44

500 80 60

600 96 - 96 -

800 96 - 96 -

1000 95

95


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2. Joints shall be as follows:

a. Pipes and fittings shall be supplied with flexible mechanical joints of the spigot

and socket type joints.b. Sealing rings shall be of elastomeric material suitable for foul sewerage andc. surfacewater drainage works, as the case maybe, conforming to BS 2494 or

ISO4633.d. Acceptance of VC pipes on delivery is dependent upon the Contractor

demonstrating that the joints are capable of meeting the water testrequirements.

e. Polypropylene sleeve couplings shall not be used.

3. Fittings shall be capable of withstanding the same load as the adjacent pipes orshall be provided with concrete surround.

Inspection and Testing

Barrel impermeability, straightness, crushing strength and bending momentresistance and chemical resistances tests shall be carried out in accordance with BSEN 295 at the frequency designated for the crushing strength test.

Repair Couplings for VC Pipes

1. Repair couplings shall be obtained from an approved manufacturer and shall

consist of a moulded synthetic elastomeric sleeve which is fastened over the pipeends by stainless steel clamping bands and be complete with a stainless steelshear ring. The repair coupling shall be suitable for use with vitrified clay pipesand shall include a bushing adapter when joining to a pipe of the same nominalbore but of a different outside diameter.

2. Repair couplings shall comply with the joint performance requirements of BS 65and be capable of withstanding an external water pressure of 60 kPa withoutleaking.

3. Sleeves and bushes shall comply with the requirements of BS EN 681-1.Clamping bands and shear ring shall be made from 300 series austeniticstainless steel.

EXTERNAL STORM DRAINAGE PIPES

(GRP pipes and fit tings for buried storm drainage system up to 1000mm)

Glass Reinforced Thermosetting Plastic (GRP) Pipe and Fittings to be used forexternal storm drainage Application.

(GRP) Pipes will be manufactured in accordance with AWWA C 950 and ASTM D3262 Standards.

Engineering: The contractor shall provide thickness calculations along with isometric

and individual shop drawings. All engineering details will be provided along with othertechnical submittal.


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SECTION 20


Stress Analysis: Appropriate stress analysis must be carried out for the GRP pipingmaterial and international standards as applicable.

20.2.04 RAIN WATER SYSTEM PIPES(piping within the building)

As shown on drawings rain water system in UPVC complying with BS 5481 andbearing the Kite mark shall be provided. UPVC rainwater systems shall be in gray asapproved by the Engineer.

All joints should remain watertight under working conditions. Pipes inside the buildingshould be capable of withstanding the water tightness of a positive pressure of 38mm water gauge for at least 3 minutes.

Rainwater pipes should be firmly supported without restricting thermal movement.Rainwater pipes shall not be encased in concrete columns structural walls and it isimportant rainwater pipes in casing or ducts are accessible for maintenance, repair,and replacement.

Relevant regulations of BS 6367, BS EN 12056-3:2000 shall be followed to ensuregood performance of the rainwater system.

BS 4514 UPVC soil and vent pipes fittings and accessories and BS 4576 UPVCrainwater goods may be used for rainwater system.

Roof drainage shall be by gravity outlets (gargoyles) sahll be madeof cast ironcomplying with BS CP 308: 1974 and the building regulations 1976.

When jointing UPVC pipes, a gap should be left between spigot end of pipe andshoulder of socket that it enters in order to allow for thermal movement.

UPVC pipes shall be with solvent weld sockets usable with seal ring adapter.

Rainwater from roofs shall flow free discharge thru gargoyles to ground level bygravity thru rain water outlets stratigically located and piped directly to the holdingtank as shown on the tender drawings

20.2.05 PIPES AND FITTINGS, INSTALLATIONS AND INSPECTION

A. Pipe Supports , Brackets and Hangers

All pipe work shall be adequately supported in such manner as to permit freemovement due to expansion contraction, vibration or other changes in the system.Supports shall be arranged as near as possible to joints and changes in direction.Spacing of supports shall comply with Table 13 contained in British Standard BS5572: 1978 Code of Practice for sanitary pipe work.

Vertical stacks shall be adequately supported at the base to stand the total weight of

the riser. Under no circumstances shall branches from vertical rising pipes be themeans of support for the vertical pipe work.


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SECTION 20


High temperature PVC waste pipe work 32 mm, 40 mm and 50 mm shall besupported using two-piece holder bats screwed to the wall using round head zincplated wood screws.

Brackets shall be galvanized steel and be rigid. Where soil and ventilation pipes aresuspended from the underside of slab, they shall be held rigid in position. Singleangle iron supports may be used for pipe work up to 500 mm from underside of slab.Double angle iron supports shall be used for pipe work 500 mm, 1000 mm from theunderside of the slab. All supports shall be proprietary brand and manufactured fromgalvanized steel. Double angle iron braces shall be installed on both single anddouble angle iron supports at 6 meter centers of vertical and horizontal runs of pipework and anchored as necessary.

B. Floor clean-outs

Floor clean-outs shall be provided as indicated on the contract drawings and asrequired even not on the drawing.

C. Roof Termination

All soil ventilation pipes shall terminate 300 mm above the point of exit from theservices duct.

D. Jointing

Jointing of UPVC and high temperature PVC shall be "O" ring and solvent welded.Prior to jointing all pipe work fittings and accessories shall be thoroughly cleaned.Pipe work shall be cut square, end chamfered, swarf, and dust removed. Prior to jointing pipes and fitting should be checked for correct position and alignment andmarked to ensure accurate assembly.

Where 'O' ring joints are to be used pipes shall be marked for insertion depth "O" ringplaced in ring seal prior to application of small quantity of lubricant or petroleum jellyaround the chamfered spigot end. The pipe shall then be inserted into the socket joint finally adjusted to the correct insertion depth.

Where solvent joints are to be used, special care shall be taken to ensure both spigotand socket are free from all dirt, grease, and swarf. Solvent cement shall then beapplied liberally and evenly to both socket and spigot prior to inserting spigot intosocket. The joint shall immediately be cleaned of surplus solvent with a dry clotharound newly formed joint.

Jointing of W.C outlet to UPVC pipe work shall be by means of either a straight orbent connector as required complete with rubber seal ring and suitable connection forW.C spigot outlet.


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SECTION 20


E. Laying Rigid Pipe

Each pipe immediately before being laid shall be carefully brushed out and inspected

for defects.

Pipes with flexible joints, except concrete protection is provided as specifiedhereafter shall be laid on a well compacted bed of granular bedding materialextending for the full width of the trench and with sufficient material at the side topermit the pipes to be worked into the granular material and firmly supported to trueline and level. Sufficient space should be left to enable the joints to be made testedand inspected but the contractor shall ensure that at least three quarters of the pipelength is fully supported. After the pipeline has been tested and approved by theConsultant the trench shall be carefully filled to 300 mm above the crown of the pipewith granular material.

F. Laying Plastic Pipe

All operations involving the laying, bedding, jointing, backfilling etc., of pipes plasticmaterials shall be strictly in accordance with the manufacturers’ recommendationssubject to the approval of the Consultant.

G. Setting Out and Pipe Alignment

All pipes and pipelines shall be laid to the lines and depths shown on the drawings or

as otherwise directed by the Consultant.

All pipelines shall be laid accurately to line and gradient so that, except whereotherwise specified, the finished pipeline is in a straight line in both horizontal andvertical planes. Where shown on the drawings or other wise permitted by theconsultant small changes of direction shall be achieved by deflection at joints withinthe maximum permitted by the manufacturer. Where the angle of the bend requiredis greater than that obtainable by joint deflection then manufactured bends of theappropriate degree shall be used. Manufactured bends shall only be used whereshown on the drawings or where otherwise permitted by the Consultant.

All pipelines forming part of a drainage system shall be laid to the specified line and

levels so that every pipeline lies in straight line in both horizontal and vertical planesbetween successive manholes on the line. No bends will be permitted other than atmanholes.

Every pipe shall placed in position individually and shall be set out accurately to theline and level required. All setting out to line and level of both pipelines and individualpipes shall be achieved by methods approved by the Consultant.

Where pipelines of constant gradient are to be laid the contractor shall provide, fixand maintain at such points as may be directed by the Consultant properly paintedsight rails and boning rods of pre-determined measurement for the boning in ofindividual pipes to correct alignment. The sight rails shall be situated vertically over

the line of pipes or immediately adjacent to and there shall at no time be less than


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SECTION 20


three sight rails in position on each length of pipeline under construction to any othergradient.

If the contractor wishes to propose an alternative method of controlling pipelinealignment, he shall submit his proposed method to the Consultant for approval.

Inspections

Written notice on prescribed form shall be given for the purpose of inspection,measurement and testing for each of the following cases:

i. Setting out completedii. Excavations completed

iii. Beddings Laidiv. Drainage Laid and ready for testingv. Drainage bedding cover complete and compactedvi. Backfilling complete and compacted with ground level finish complete and ready

for final testing.

20.2.06 MANHOLES

CEMENT AND CONCRETE

All cement used in all classes of concrete for drainage and sewerage works whether

above or below ground level shall be sulphate resistant cement complying with BS4027.

Cement mortar shall consist of sulphate-resisting cement and sand gauged byvolume in suitable boxes in the proportions given in Section 20 of the latest edition ofQCS.

Unless otherwise specified cement mortar shall be SRC Class No. 1.

The ingredients of the mortar shall be mixed in an approved mechanical mixer orshall be mixed together dry on a clean wooden stage until the mix is homogeneous incolour. Water shall then be added through a rose in sufficient quantity to give no

more than stiff workability. The whole shall then be turned until perfectly mixed.

Mortar shall be used within 30 minutes of mixing and shall not be remixed or workedup again after it has stiffened. Any mortar that has commenced to set shall beremoved from the works.

MANHOLES

A. General

Manholes shall be provided at all changes in direction gradient or diameter.


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SECTION 20


The manholes shall be of the sizes and grades indicated on the Contract drawingsand fully comply with CED regulations and latest edition of QCS Section 20.

B. Block work Manholes

Blockwork manholes shall be constructed on the drain lines in the positions and tothe dimensions indicated on Drawings or as directed on site by the Consultant.

The type of construction for each chamber shall be as indicated on the ContractDrawings.

Concrete blocks used for chamber construction shall be manufactured with sulphateresisting cement and shall comply with the requirements of the latest edition of QCS

Section 20-5-1. Hollow concrete blocks shall be filled solid with concrete Grade SRC20.

Each manhole shall be built on a minimum of 75 mm thick blinding of grade SRC 25concrete which shall be laid on a dry clean firm foundation free from unsoundmaterial. If the bed of the excavation is wet, the top surface of the blinding shall becoated with an approved waterproofing material.

Foundation base slabs shall be cast in-situ Mass concrete foundation, slabs shall beof concrete Grade SRC 20. Reinforced concrete foundation slabs shall be ofconcrete Grade SRC 30.

Internal and external faces of the blockwork walls shall be finished with 12 mm thickSRC mortar rendering Class 1.

All internal faces of manhole chambers except benching and vitrified clay channelfittings shall be painted with one primer coat and tow final coats of black bitumencoating water proofing solution to BS 3416, type 1 or equal and approved.

All exterior faces of manhole chambers shall be protected with 1000 gauge polythenemembrane with hardboard protection against damage during backfilling.

Where indicated on the Drawings, manhole cover frames shall be supported on solidprecast concrete bricks, manufactured from Grade SRC 30 concrete.

Reinforced cover slabs shall be provided where manhole access opening are lessthan the internal dimensions of the manhole chamber.

The cover slabs shall be mounted by ductile or cast iron manhole covers and framesof the quality specified. The covers in roads and paved areas shall be accurately seton precast concrete brick-work to the level and slopes of the roads or pavements.

Manhole inverts shall be constructed of half section vitrified clay channels. Halfsection vitrified clay channel branch bends shall be used for branch connections.Benching in manholes shall be carefully formed according to the number, diameterand positions of the incoming and outgoing pipes. The benching in the manholes

shall have vertical sides extending from the vitrified clay channels at least to the level


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SECTION 20


of the crown of the highest pipe. The benching shall be sloped towards the channelsat a gradient of 1 in 10 or as otherwise detailed on the drawings.

The benching shall be rendered with a 12 mm thickness of epoxy mortar rendering.The ends of all pipes entering and leaving the manhole are to carefully cut to shapeto suit the internal dimensions of the manholes, and shall project through on theinside, the benching being continued round the pipe to form a fillet.

20.2.07 MANHOLE COVERS AND GULLY GRATINGS

Manhole covers / gratings shall comply with BS 497:1976 and shall be of the sizesand types as shown on the contract drawings.

In general, manhole covers/ grating shall be one of three types, as follows unlessotherwise specified.

a. Heavy Duty to BS 497 Grade Ab. Medium Duty to BS 497 Grade Bc. Light Duty to BS 497 Grade C

Heavy Duty

All manholes & Gullies installed in roadways or trafficked areas shall be heavy to BS497 Grade A. Reference M.A 60.

The cover and frame shall be made from ductile iron and the cover shall be of theloosely-bolted double triangular type with three point suspension to provide stabilityunder load.

Medium Duty

All manholes & Gullies installed external to buildings, but not in roadways ortrafficked areas, shall be medium duty to BS 497 Grade B1.

The over and frame shall be of grey or ductile iron and the cover shall be either

rectangular or circular as specified in the Manhole Schedule. Such manholes shallincorporate a single seal between cover and frame. Following flushing out andtesting of the drainage system, the sealing groove shall be filled with grease toprovide an airtight seal.

Light Duty

All manholes & Gullies installed within buildings and not subject to motor vehicles orindustrial trolleys etc. shall be light duty to BS 497 Grade C of the lockable type

The cover and frame shall be made from grey iron and shall incorporate a double

seal between cover and frame. Following out and testing of the drainage system, thesealing grooves shall be filled with grease to provide an airtight seal.


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SECTION 20


In those areas where it is required to accept a tilled floor finish, the manhole coversshall be of the recessed type. In kitchens or other areas subject to washing-downmanhole covers and frames shall have stainless steel edging and trim. Double cover

units shall be provided where specified in the Manhole schedule.

The contractor shall provide two sets of lifting key for each type of manhole.

Manhole covers and frames shall be as approved.

Step Irons

Step irons shall be manufactured from galvanized malleable cast iron and shallcomply with BS 1247 – 3 : 1991 - BSEN 13101 : 2002 and be of the general purpose

or precast concrete manhole pattern as applicable.

The tail length shall be 230 mm for both manhole types.

22.2.08 OIL AND SAND INTERCEPTORS

The construction of oil Interceptors shall be in accordance with BS : 8007, 1987. Allcement shall be sulphate resisting and comply with BS :4027, 1980. All reinforcedconcrete base slab walls and cover slab shall be cast in situ using grade 25 concreteand comply with BS:8110, Part 1, 1985.

The oil interceptors shall be constructed to take into account the ground conditions,strictly in accordance with the structural engineering details.

Oil interceptor tank shall be painted internally with epoxy mortar or pitch epoxy (2coats) and externally with one coat of bituminous emulsion paint. A 600x600-mmaccess manholes shall be provided at the end, with heavy duty manhole covers asdetailed in the schedule of manholes. Galvanized step irons to BS: 1247, 1975 shallbe provided at 300 mm centers both vertically and horizontally, the first being 450mm below cover level. The inlet and outlet foul sewer shall be cast iron and have apuddle flange located within the holding tank wall. The inlet shall be via a cast ironinlet tee complete with access cap.

20.2.9 PROTECTION OF DRAINAGE PIPES

A. Concrete Protection to Pipelines

All underground drainage pipe work shall be surrounded with 150 mm thick GradeSRC 20 sulphate resisting concrete, along its entire length in the following locations:

1. All drainage below buildings or structural elements2. All drainage with less than 600 mm cover.3. Drainage with a cover of between 600 mm and 1200 mm where there is

vehicular traffic over the ground above the drain line.

4. Elsewhere as indicated on the Contract drawings.


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SECTION 20


The required depths of concrete bed and height of concrete backfill shall be asindicated on the Contract drawings.

Where a concrete bed and surround is specified, a minimum of 75 mm blinding ofconcrete Grade 25 shall first be laid over the full width of the trench.

The pipes shall be laid jointed and supported on precast concrete blocks, which shallbe separated from the barrel by 25 mm thick timber packing.

After the pipeline has been tested and approved by the Consultant the top of theconcrete bed shall be thoroughly cleaned and additional concrete Grade SRC 20carefully placed and compacted under and around the pipe to a height of at least 150mm above the crown of the pipe.

Where pipes with flexible joints are to be surrounded 13 mm thick fiberboard orpolystyrene sheets shall be fixed at the pipe coupling joint extending for the full crosssection of the remaining concrete bed and surround, and accurately cut to fit theprofile of the pipe.

B. Pipelines Protection From Extraneous Material

The pipelines shall at all times be kept free of extraneous material and when work isnot is progress the open ends of the pipeline shall be securely plugged with anapproved watertight plug or stopper. Claw type plugs or any type liable to damagethe pipe will not be approved.

The contractor shall clear the inside of each fitting and pipe length immediately priorto jointing and shall swab all fittings and pipe lengths to remove all dirt sand or othermatter that may contaminate the pipeline.

The entire absence of foreign matter from the completed line shall be a conditionprecedent to acceptance.

C. Trenches

All trenches excavation shall comply fully with all the relevant clauses of the latest

edition of QCS Section 20-2 and this specification, Trench depths shall be sufficientto allow the installation of the required pipe bedding, granular or concrete asspecified. Generally, the depth of cover shall not be less than 600 mm unlessotherwise indicated on the contract drawings.

Trench width shall be in accordance with the following table:

Nominal Minimum MaximumPipe Bore Width Widthmm mm mm

100 430 630

150 490 690200 560 760


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SECTION 20


The maximum and minimum widths shall apply from the bottom of the trench to 300mm above the crown of the pipe.

Should the trench be excavated to a depth greater than is required in the opinion ofthe Consultant. The contractor shall fill in the bottom of the trench to the requireddepth with concrete or other such materials as the Consultant may direct.

In the case of trench excavations made in roads, footpaths, verges, central strips orwithin 5 meters of buildings the contractor will be required to execute the works so asto minimize damage and disturbance. Vertical trench side will generally requiresupport by timbering or other suitable means. Under-cutting of trench sides will notbe permitted.

D. Granular Bedding Material for Rigid Pipes

Granular bedding material for rigid pipes shall consist of gravel or broken stone andshall be a suitable "all in" ballast or stone.

For pipes up to 1200 millimeters nominal bore the material shall be graded 12millimeters to 5 millimeters all passing 12 millimeters and not more than 20 percentpassing 5 percent millimeters B.S sieve.

E. Backfi lling Excavation

After compaction of the granular bed and surround or completion of concretesurround, the trench shall be backfilled using selected excavated material freefrom all rocks, large hard on objects and builders debris of greater than 40 mm.Backfilling shall take place immediately after the specified operations preceding it hasbeen completed and shall be in layers of 150 mm. each fully compacted over the fullwidth of the trench. Power rammers and vibrators shall be used to compactbackfilling when the cover over the crown of the pipe exceeds 0.5 meters.

20.2.10 TESTING AND COMMISSIONING

All drainpipes shall be tested in accordance with the requirements of BS 8301 and

the requirements of Section 20 – 5.3.1 of the Q.C.S.

As per latest edition of QCS 2007,section 22, part-1,item.1.1.26, theelectromechanical contractor shall employ the in depended third party services of aspecialist testing and commissioning company approved by the engineer, thespecialist company should be regularly engaged in providing a testing &commissioning services in continuous business for not less than 7 years.

The Consultant shall witness all drainage tests. The contractor shall give theConsultant a minimum of 24 hours notice of all tests. The contractor shall alsoprovide test sheets set out in an agreed manner for each drain section to be tested.


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SECTION 20


The contractor having ensured that water, electricity and other necessary suppliesare available shall set to work the completed works or part thereof, at the instructionof the consultant and make the necessary adjustments to ensure correct functioning.

After the installation or part thereof has been set to work and adjusted, the contractorshall demonstrate its operation at a time selected by and to the satisfaction of theConsultant. Tests shall be in accordance with British Standard BS 6700: 1987.

The tests shall demonstrate:

a. That equipment provided complies with the specification in all particulars andis of adequate capacity for its full rates of duty.

b. That all items of plant and equipment operate quite sufficiently to meet the

specified requirements.

c. That all instruments protection and control devices etc, are correctlycalibrated and accurate.

d. That all drainage runs satisfy the required water tests.

The details of method of carrying out the recording of tests shall be agreed with theEngineer. The Client's representative and the Consultant shall be at liberty to bepresent at tests and to participate in the tests. This shall not relieve the contractor ofhis responsibilities for carrying out the tests satisfactorily.

The contractor shall make all records during the tests and on completion thereof shallprovide the Consultant with a test report and record, both in triplicate. The contractorshall also provide all test instruments together with skilled supervision and adequatelabor for carrying out the tests.

A. Proving Tests

All under slab, underground drainage, soil, and waste system shall be cleaned downand thoroughly flushed out to remove all dirt within each pipe work system.

After each system has been flushed and each draw off fitting opened and the

drainage, soil and waste system shall be checked for satisfactory rate flow. Particularattention shall be given to groups of sanitary fittings to ensure satisfactory flow whena number of fittings are flushed and air not drawn into the system via any trap.

B. Water Test

All drains shall be tested before backfilling immediately after the drain has beenproperly laid on the correct trench bed and after joining materials has had time to set. A water test pressure of 1.3 m head above the soffit of the drain shall be applied atthe high end, but not more than 2.4 m head at the low end. The test shall be carriedout on lengths of drain not less than half the distance between manholes, all to be

agreed with the Consultant on site. The lower end of the drain shall be plugged andthe higher end shall have a stand pipe not less than 1.2 m high. The drain shall be


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SECTION 20


filled, taking care to eliminate trapped air. After repair of leakage due to defectivepipes, joints and plugs the drain under test shall be left for one hour to allow waterabsorption by pipes and fittings. The loss of water over a period measuring vessel at

intervals of ten minutes and noting the quantity of water required to maintain theoriginal level in the standpipe. For drains up to 300 mm diameter, the water quantityadded shall not exceed 0.06 liter per hour per 100 linear meters per millimeter ofnominal bore of the drain under test.

All drains shall be tested for a second time as described above after correct beddingcover and selected backfill have been consolidated and the finished surfacecomplete.

C. Air Test

A gauge in the form of a "U" tube shall be connected to the plug fixed at one end ofthe length to be tested and all junctions and connections to the sewer on drain shallbe plugged. Air shall then be pumped in from the other end of the drain under testuntil a pressure equal to 100 mm of water is indicated on the gauge. Without furtherpumping, the pressure shall not fall more than 25 mm during a period of five minutes.

Air tests shall be carried out after 3 p.m. and all pipe work shall be shaded from thesun at all times. Should an air test fail a water test shall be carried out as described inthis specification.

D. Prof ile Test

A hardwood ball of an approved profile shall be drawn through all foul drains frommanhole to manhole and through branch foul drains before soil pipes, gullies andW.C's are filled. The diameter of the ball or profile shall differ from the nominalinternal diameter of the pipe by not more than 6 mm or by not more than 45% of thenominal internal diameter of the pipe whichever is the greater difference.

During commissioning all manhole cover shall be removed and water flow tests shallbe carried out to ensure that the drains are flowing at their designed capacity andthat they are free of debris.

E. Manhole Test

All manholes shall be tested in accordance with the requirements of BS 8301 and therequirements of Section 20 of Q.C.S.

The Consultant shall witness all manhole tests. The contractor shall give theConsultant a minimum of 24 hours notice of all tests. The contract shall also providetest sheets set out in an agreed manner for each manhole to be tested.

All concrete manholes cast in situ and precast concrete manholes shall be watertests by plugging all necessary connections and filling the manhole with water to a

minimum height of 600 mm above the top of the benching. Water shall be added at


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SECTION 20

ten minute intervals until absorption has ceased. No change of water level shall occurfor an uninterrupted period of three hours.

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