22 11 13 - facility water distribution piping.pdf

MINISTRY OF HOUSING Western Sector Projects Sitework & Infrastructure OMRANIA and ASSOCIATES Project Specification

FACILITY WATER DISTRIBUTION PIPING SECTION 22 11 13 - 1

SECTION 23 11 13

FACILITY WATER DISTRIBUTION PIPING PART 1: GENERAL

1.01 SECTION INCLUDES

A. Above ground plumbing piping installations including, but not limited to the following:

1. Soil (sewage) and vent pipework.

2. Waste water drainage pipework.

3. Rain water drainage pipework.

4. Hot and cold water supply pipework.

1.02 RELATED SECTIONS

A. Section 22 05 00 Common Work Results for Plumbing.

B. Section 22 05 53 Identification for Plumbing Piping and Equipment.

C. Section 22 05 23 General Duty Valves for Plumbing Piping.

D. Section 22 05 29 Hangers and Supports for Plumbing Piping and Equipment.

E. Section 22 13 19 Sanitary Waste Piping Specialties.

F. Section 22 07 00 Plumbing Insulation.

1.03 REFERENCES

A. ASME B 16.4 Cast Iron threaded Fittings.

B. ASME B 16.12 Cast Iron threaded Drainage Fittings.

C. ASME B 16.18 Cast Copper Alloy Solder Joint Pressure Fittings.

D. ASME B 16.22 Wrought Copper Alloy Solder Joint Pressure Fittings.

E. ASME B 16.23 Cast Copper Alloy Solder Joint Drainage Fittings.

F. ASME B 16.42 Ductile Iron Pipe Flanges and Flange Fittings Class 150,300.

G. ASTM A 53 Pipe, Steel, Black and Hot Dipped, Zinc Coated welded and Seamless.

H. ASTM A 74 Cast Iron Soil Pipe and Fittings.

I. ASTM A 888 Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm Drain, Waste and Vent Piping.

J. ASTM C 564 Rubber Gaskets for Cast Iron Soil Pipe and Fittings.

K. ASTM D 1785 Polyvinyl Chloride (PVC) Plastic Pipe, Schedules 40, 80 and 120.

L. ASTM D 2235 Solvent Cement for Acrylonitrile Butadiene Styrene (ABS) Plastic Pipe and Fittings.



M. ASTM D 2239 Polyethylene (PE) Plastic Pipe Based on Controlled Outside Diameter.

N. ASTM D 2464 Threaded Polyvinyl Chloride (PVC) Plastic Pipe Fittings, Schedule 40.

O. ASTM D 2468 Acrylonitrile Butadiene Styrene (ABS) Plastic Pipe Fittings, Schedule 40.

P. ASTM D 2564 Solvent Cement for Polyvinyl Chloride (PVC) Plastic Pipe and Fittings.

Q. ASTM D 2665 Polyvinyl Chloride (PVC) Plastic Drain, Waste and Vent Pipe Fittings.

R. ASTM D 2846 Chlorinated Polyvinyl Chloride (CPVC) Hot and Cold Water Distribution Systems.

S. ASTM D 2855 Making Solvent Cemented Joints with Polyvinyl Chloride (PVC) Plastic Pipe and Fittings.

T. ASTM D 3311 Drain, Waste and Vent Plastic Fittings Patterns.

U. ASTM F 437 Threaded Chlorinated Polyvinyl Chloride (CPVC) Plastic Pipe fittings, Schedule 80.

V. ASTM F 438 Socket Type Chlorinated Polyvinyl Chloride (CPVC) Plastic Pipe fittings, Schedule 40.

W. ASTM F 439 Socket Type Chlorinated Polyvinyl Chloride (CPVC) Plastic Pipe fittings, Schedule 80.

X. ASTM F 441 Chlorinated Polyvinyl Chloride (CPVC) Plastic Pipe fittings, Schedules 40 and 80.

Y. ASTM F 477 Elastomeric Seals (Gaskets) for Joining Plastic Pipes.

Z. ASTM F 493 Solvent Cements for Chlorinated Polyvinyl Chloride (CPVC) Plastic Pipe and Fittings.

AA. ASTM F 714 Polyethylene Plastic Pipe (SDR-PR) Based on Outside Diameter.

BB. ASTM F 1248 Determination of Environment Stress Crack Resistance of Polyethylene Pipe.

CC. AWS Welding and Brazing Qualifications.

DD. AWWA C 110 American Water Works Association - Ductile Iron and Gray Iron Fittings 3 through 48, for Water and other Liquids.

EE. AWWA C 151 American Water Works Association - Ductile Iron Pipe, Centrifugally Cast for Water and other Liquids.

FF. IAPMO International Association of Plumbing and Mechanical Officials - Uniform Plumbing Code.

GG. SASO 14 Pipes for Potable Water of Unplasticized Plastic (Polyvinyl Chloride).



HH. SASO 15 Methods of Testing of Pipes for Potable Water of Unplasticized Plastic (Polyvinyl Chloride).

1.04 SUBMITTALS

A. Comply with Section 01 33 00.

B. Drawings: Comply with Section 22 05 00.

1.05 QUALITY ASSURANCE

A. Manufacturers: Firms who have been regularly engaged in the manufacture of plumbing pipework systems and whose products have proved satisfactory in similar service for not less than 10 years.

B. Installer: Firms proposed for the installation of the plumbing pipework systems shall have been regularly engaged for at least 5 years in the installation of work of a similar type, quality and scope as is required for the project.

1.06 OPERATION AND MAINTENANCE DATA

A. Comply with Sections 01 78 23 and 22 05 00.

1.07 DELIVERY, STORAGE AND HANDLING

A. All products shall be delivered in manufacturer's original protective packaging. All products shall be inspected at time of delivery for damage and for compliance with Specifications. Any products that are found to be damaged or not in accordance with the Specifications shall immediately be repaired or removed from the site and replaced. Repairs shall not be undertaken before the Engineer's review of Contractor's proposed action.

B. All products shall be handled and stored as recommended by the manufacturer to prevent damage and deterioration. Supply handling equipment such as lifting beams, reinforced canvas slings, protective padding, struts, cradles, etc., required to handle the products without damaging hardware or linings and coatings.

C. Products shall be protected against damage and ambient conditions during transport, site storage and immediately up to the time products are installed. Precautions shall be taken to protect products from mechanical damage and the effects of sunlight and heat, until the backfilling operations have been completed. All site storage areas shall be shaded.

D. All pipes shall be stored on purpose-made pipe racks of welded construction and of sufficient strength to support the entire weight of the materials without any noticeable deformation. The racks shall be such that all pipework is clear of the ground.

E. All black steel pipework shall be given one coat of red oxide paint immediately after delivery and prior to storage. The open ends of pipework shall be blanked off with purpose- made or manufactured plugs.

F. Pipe fittings shall be stored within containers made on well-lit compartmented racks or shelves. Fittings shall be separated by means of their type and size and laid out in an orderly manner for ease of identification.

1.08 WARRANTY

A. Comply with Section 01 78 36.



PART 2: PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS

Not Used.

2.02 PIPES AND FITTINGS SCHEDULE

A. Pipes and fittings shall be in accordance with the following schedule:

SERVICE MATERIAL

Main soil, waste and vent pipes Unplasticized Polyvinyl Chloride (uPVC) Branch waste and vent pipes Unplasticized Polyvinyl Chloride (uPVC) Kitchen waste pipes and others taking high

Cast iron (CI)

Hot water service flow and return below 75

Chlorinated Polyvinyl Chloride(cPVC)

Hot water service flow and returns 75 mm


Cold water service below 75 mm nominal


Cold water service 75 mm nominal diameter


Rainwater pipes Unplasticized Polyvinyl Chloride (uPVC) Condensate drains Unplasticized Polyvinyl Chloride (uPVC)

2.03 MATERIALS

A. Unplasticized Polyvinyl Chloride (uPVC) pipework and fittings for soil, waste and vent:

1. uPVC pipework and fittings buried in ground under floor slab shall be in accordance with SASO SAS 14 Class 5.

2. Jointing of buried in ground under floor slab pipework and fittings for uPVC class 5 shall be by the use of solvent weld sockets carried out in accordance with the manufacturers instructions. Solvent weld cement shall be of a type approved by the manufacturer of the pipework being joined.

3. uPVC pipework and fittings installed aboveground shall be in accordance with SASO SAS 14 Class 4.

4. Jointing of aboveground uPVC Class 4 pipework and fittings shall be by rubber ring seal joints. Additional ring seal joints shall be provided as necessary to account for expansion and contraction.

B. Chlorinated polyvinyl chloride pipework (cPVC):



1. Chlorinated polyvinyl chloride pipework shall be Schedule 80 to ASTM F 439.

2. Joints shall be made using solvent cement to ASTM F 493 as approved by the manufacturer of the pipework being joined.

PART 3: EXECUTION 3.01 SOIL, WASTE AND RAIN WATER PIPEWORK

A. Materials and workmanship shall be of best quality and executed in accordance with the Specification, Drawings and manufacturers recommendations.

B. Where any pipe is required to be shortened, it shall be cut off square and cleanly with an approved pipe-cutting machine.

C. Where special joints or jointing materials are shown for pipes of any materials, they shall be of an approved type and manufacture, and the joint shall be made in accordance with the manufacturer's instructions, or as directed.

D. Responsibility shall be assumed to identify and install all necessary expansion couplings and fire sleeves throughout the installations.

E. All plant, pipes and fittings etc. shall be thoroughly cleaned of all foreign matter before installation. Each section of the installation shall be clean and free from any obstructions whatsoever before proceeding with the next section of the installation.

F. Flexible joints shall be provided wherever pipes cross expansion joints.

G. All soil, waste, vent and rainwater pipes shall be to the sizes and positions shown on the Drawings to take the discharge from the branch waste and vent pipes, sanitary fittings and equipment adjacent thereto.

H. On completion, the whole of the work shall be handed over in a sound and clean condition. In the event of any pipe being fractured from any cause whatsoever after having been (to all appearances) properly installed, responsibility shall be assumed in every instance and any such defective pipes shall be replaced for approval.

I. All pipework shall be erected to present a neat and orderly appearance, arranged parallel to or at right-angles to the structural members of buildings, giving maximum headroom and not to obstruct windows or doorways. Pipework shall be erected such that there is a minimum clearance of 75 mm to finished floor level and a minimum clearance of 25 mm to finished wall faces.

J. Slopes of drainage system (gravity) shall be a minimum of: Foul water and drain pipes within wet areas - 2%; at long runs 1%; and rainwater pipes - 1%.

K. Discharge pipework shall be so installed as to minimize the risk of blockage. Access covers and/or rodding eyes shall be positioned such as to enable maintenance equipment to be inserted into the system(s) to permit cleaning or clearing of all sections of the system(s).

L. Pipework and fittings shall be installed so that broken or defective parts can be easily removed and replaced.

M. Discharge pipework shall be installed such that there is no leakage of contaminated water or foul air into any building.



N. Work shall be set out and responsibility assumed for the accuracy of the same and the position of all fittings shall be approved by the Engineer.

O. Responsibility shall be assumed for leaving all unfinished works in a safe condition during the progress of the works.

P. All materials and equipment shall be installed and protected in such manner as to be adequately covered against damage and deterioration, and during the execution of the work the open ends of all pipework shall be temporarily plugged off by means of blank ends and compression caps.

Q. Vent pipe roof termination:

1. Discharge stacks complete with domical cages shall terminate not less than 300 mm vertically above finished roof level and roof, 900 mm above and not less than 3000 mm, measured horizontally from any window or air conditioner.

2. Where the stack passes through floors, ceilings and roofs, the openings shall be perfectly sealed-off by proprietary fittings. Stacks shall terminate with neoprene aluminum weathering slate, weathering collar and a balloon grating on a 180 degree bend.

R. All branch waste pipes to a range of fittings shall have an access provided on the pipe in an accessible position at the end of the run.

S. All pipework shall be supported in accordance with the manufacturers recommendations. Pipe hangers and brackets shall be in accordance with Section 22 05 29.

T. Sleeves shall be provided where pipes pass through walls or floors. Pipe sleeves shall be compatible with the pipes they protect; non-combustible and 1.5 times the diameter of the pipe. Void between pipe and pipe sleeve shall be packed with mineral wool and sealed with approved mastic sealant.

U. Where plastic pipes 50 mm diameter and larger pass through fire compartment walls, floors or ceiling cavity barriers, they shall be fitted with intumescent collars having the same fire resistance rating as the fire barrier they pass through. Intumescent collars shall be approved by the Engineer.

V. All pipe fittings shall be of the same color as the pipework used.

W. All vertical soil and waste pipes shall have access doors on each floor fitted above the spillover level of fittings served. Where pipes are installed in ducts or built into walls, access doors shall be provided in the duct wall or wall for access to the pipe access door. The type and finish of the access shall be to suit the location and to the approval of the Engineer.

X. In plant rooms and other areas where rainwater soil, waste and vent pipework is susceptible to mechanical damage, pipes shall be of cast iron.

Y. Connection to sanitary fittings:

1. All outlets shall be trapped and provided with accessible and adequate means of removal and cleaning. Traps shall be designed to be self-cleaning. All surfaces and joints shall be smooth.

2. All traps with outlets for pipes up to and including 50 mm shall have a minimum water seal of 75 mm.

3. Traps with outlets for pipes of over 50 mm shall have a minimum water seal of 50 mm.



4. Waste pipes to the various sanitary fittings shall be of the following minimum sizes:

a. Wash basins: 32 mm diameter.

b. Sinks: 40 mm diameter.

c. Water closets: 100 mm diameter.

d. Shower bath tray: 40 mm diameter.

e. Floor gullies: 50 mm diameter.

Z. Condensate drains shall be provided from all fan coil units, packaged units etc. piped to the nearest floor drain, other suitable drain point or as shown on the Drawings.

AA. Self Siphonage Tests: Undertake tests for self-siphonage and induced siphonage in branch discharge pipes by filling each appliance to overflowing and then discharging by removing the plugs and discharging w.c.(s) at the upstream end of the discharge pipe. All seals shall remain in the traps. The numbers of sanitary appliances to be discharged for this performance test shall be as shown in the following table:

Type of use Number of appliances of each kind on stack

Number of appliances to be discharged simultaneously

W.C. Wash Basin Sink Domestic 1 to 9 1 1 1

24 to 24 1 1 2

Congested

1 to 24 1 1 5 to 19 1 2 10 to 13 2 2 14 to 26 2 3 27 to 39 3 4 40 to 50 3 5

BB. Testing and Commissioning:

1. All tests requested by the approving Authority on the entire installation shall be carried out, and all necessary appliances and equipment for this purpose shall be supplied.

2. Provision shall be made to carry out any test requested at any time during the progress of the works or after completion.

3. Whilst phased testing may be carried out (which may or may not have been witnessed) the Contractor shall be required to demonstrate the water tightness, alignment, and level and cleanliness of the whole installation seven days prior to the installation being handed over.

4. All tests shall be carried out in the presence of the Engineer, and a minimum of 48 hours notice shall be given of readiness to test any section of the installation. Test Certificates shall be submitted to the person witnessing the test for their signature of approval, to the effect that the system satisfies the requirements of this Specification.

5. All sections of works shall be pre-tested to satisfy that the system will pass the required test, prior to carrying out the main test.

6. The Test Certificate shall be required to be completed for all sections of the installation.



7. After erection and immediately prior to sealing in, all rainwater, main soil, waste, vent and branch soil, waste pipes, shall be checked throughout for obstructions and finally tested for soundness.

8. The above-ground sanitation and rainwater pipe installation shall be subjected to two air tests, one of 75 mm water gauge for a minimum period of 15 minutes prior to connection of sanitary fittings and building in of pipework, and a second air test on completion of the system with all traps and w.c.'s connected when the test pressure shall be 45 mm water gauge for a minimum period of 15 minutes.

9. At start of testing, sanitation and rainwater pipework shall be checked for alignment and stability. Mechanical joints shall be re-torqued where necessary.

10. Access doors shall be removed, felt washers greased and doors replaced.

11. The whole system shall be rodded through with an appropriately sized disc.

3.02 POTABLE HOT AND COLD WATER SERVICES PIPEWORK

A. Pipework from the water meter to the inside of buildings, where running below ground level shall be HDPE PE-100 PN16. Distribution within buildings shall be cPVC Schedule 80 pipes.

B. Joints in buried pipework shall be kept to the absolute minimum. Marker tapes with embedded metal strip shall be laid 150 mm above the pipework. If valves are required, they shall be in a valve chamber with the surface box lettered to indicate the service below.

C. Underground pipework shall be laid in 200 mm of sand or stone free bedding material and wherever possible in straight lines to uniform gradients. The clearance between the pipework and footings of the buildings is not to be less than 200 mm. If less, the pipes shall be installed in a flexible sleeve.

D. All pipework shall run vertically or at an inclination of 1% to the horizontal to enable the whole system to be drained off either through the system or through a valve discharging externally with an air gap to prevent contamination by backflow. When the pipework is drained down, air shall be allowed into the system to prevent failure or damage to the hot water cylinder. A manual air inlet valve shall be fitted to the high point in the system to achieve this.

E. Where pipes are run chased into walls, floors, etc., all pipework shall be insulated.

F. All pipework shall be installed to present a neat and orderly appearance, arranged parallel to or at right-angles to the structural members of buildings, giving maximum headroom and shall not obstruct windows or doorways. Pipes shall bend round piers, projections and into recesses forming part of the structural works whether or not shown on the Drawings. Pipework shall be erected such that there is a minimum clearance of 75 mm to the finished floor level and at least 25 mm to the finished wall faces.

G. All fittings shall, as far as practicable, be the same size as the tubes and pipes connected to them. Bushed outlets shall only be accepted if the required outlet size of a fitting is not of standard manufacture. Eccentric bushings and square tees shall be used where concentric bushing and pitcher tees might cause air to be trapped in the system. Elsewhere, square tees shall be confined to dead-leg branches of domestic hot water supply systems and on cold-water branches to fitting or ranges of fittings.

H. Elbows shall be used, where practicable, in preference to bends. Square elbows shall not be permitted.



I. Pipework shall follow the contours of walls and shall be graded to ensure venting and draining. Clearance between pipework (or the insulation) and the wall and any other fixtures shall be not less than 20 mm.

J. Purpose-made sets or springs may be used where it is necessary to deviate from a straight run.

K. Sets or springs in tubes of 50 mm size and above shall be fire-made and tubes shall remain circular after setting.

L. Eccentric reducing sockets shall be used where changes of bore are made in runs of nominally horizontal pipework to facilitate air venting and draining.

M. Tubes shall be reamed after cutting and shall be free from burrs, rust scale and other defects and shall be thoroughly cleaned before erection. Open ends left during the progress of work shall be temporarily closed with purpose-made metal or plastic plugs or caps, or blank metal flanges.

N. All joints between copper and steel pipes shall be made using dielectric couplings. Copper pipework shall not be installed upstream of galvanized steel pipework.

O. Where pipework passes through walls, floors or ceilings, sleeves shall be provided. Pipework passing through flooring shall be provided with approved type floor and ceiling plates fastened securely to the pipe. The sleeves shall be of the same metal as the pipe.

P. All entry and exit holes to or from a building for pipework services shall be sealed and plugged. For service conditions below 60 oC, the sealant shall be mastic compound. Above this temperature it shall be silicon rubber. Where the pipework enters the building through a large hole or duct, a mild steel blanking plate not less than 6 mm thick shall be built into the walls of the hole or duct. The service pipes shall pass through clearance sockets welded to the plate and the space between pipe exterior and socket interior shall be sealed and plugged.

Q. All pipes shall be secured by appropriate metal clips or brackets to allow for thermal movement and support at spacing not exceeding 300 mm.

R. Pipework of 75 mm size and larger subject to expansion and contraction and hung from supports shall be suspended on swivel hangers unless otherwise approved.

S. Hangers for horizontal pipework shall be supported in accordance with the requirements of Section 22 05 29.

T. Piping that is insulated shall be secured by clips that allow sufficient space behind the back of the pipe for the pipe insulation to be properly installed.

U. All pipework shall be installed so that the vertical distance between the discharge point and overflow level of the receiving appliance shall not be less than 25 mm for taps and/or fittings up to and including 20 mm and 70 mm for those over 20 mm, to prevent contamination as a result of backflow of water.

V. A 20 mm diameter washout pipe, discharging outside the building shall be provided at ground floor level to drain the system. The top of the outlet shall be greater than 70 mm from the ground or receiver.

W. Double check valve assemblies or other suitable backflow preventers shall be installed on cold water makeup pipes to HVAC equipment and wherever equipment is supplied that may allow backflow.

X. Water hammer arrestors shall be provided on horizontal piping to fixtures and equipment



having quick closing valves or flush valves and as shown on the Drawings.

Y. Where drinking water and non-potable water supply points are installed, they shall be clearly marked to provide ready identification. Every drinking water point shall be segregated from fire fighting water supply points. Every drinking water pipe shall be readily distinguishable from other pipes. Drinking water hoses and flexible pipes shall be marked to prevent them being used for cleaning purposes.

Z. All treated water distribution pipework shall separately identified/painted as detailed in Section 09 91 00.

AA. All flush water pipework shall be painted brown.

BB. System Testing:

1. Ensure that all pipework is watertight to the satisfaction of the Engineer and supply all pressure gauges, meters, hoses, pumps and other temporary supports, equipment and manpower necessary for carrying out pressure tests.

2. During testing, check the satisfactory operation of each valve installed under the Contract.

3. Before filling or pressure testing is started, re-check pipes and valves for cleanliness and re-check the operation of valves. The open ends of the pipes shall normally be stopped off by blank flanges or capped ends additionally secured where necessary by temporary struts and wedges.

4. Potable water system shall be tested with water to 1.5 times the normal system working pressure or 6 bar whichever is greater while uncovered but adequately anchored. The testing shall be carried out in sections if necessary. If a section should fail the test, the Contractor shall trace and repair all leaks and defects and retest the section before any further pipes or section of adjacent pipework are laid.

5. The system shall be filled with potable water and all air expelled. After the system has been completely filled, the pressure shall be steadily and gradually increased until the test pressure has been reached. If any loss is recorded, repairs shall be made and the test re-run.

6. Written records of every test clearly identifying the tested system together with time of test and name of testing Engineer in tabulated format shall be submitted for review by the Engineer upon completion of the test.

CC. Flushing and Disinfection:

1. All visible dirt and debris shall be removed from the tank.

2. The tank and distributing pipes shall be filled with clean, potable water and then drained until empty of all water.

3. The tank shall be filled with clean potable water and the supply closed.

4. A measured quantity of sodium hypochlorite solution of a known strength shall be added to the water in the tank to give a free residual chlorine concentration of 50 mg/l (50 ppm) in the water.

5. The tank shall be left to stand for 1 hour.

6. Each draw-off fitting shall be successively opened, working progressively away from the tank.



7. Each tap and draw off fitting shall be closed when the water discharged smells of chlorine.

8. The tank shall not be allowed to become empty during this operation. If necessary it shall be refilled and chlorinated as above.

9. The cistern and pipes shall then remain charged for a further 1 hour.

10. The tap furthest from the cistern shall be opened and the level of free residual chlorine in the water discharged from the tap shall be measured. If the concentration of free residual chlorine is less then 30 mg/l (30 ppm) the disinfecting process shall be repeated.

11. The tank and pipes shall remain charged for at least 16 hours and then thoroughly flushed out with clean, potable water until the free residual chlorine concentration at the taps is no greater than 21 mg/l (21 ppm).

END OF SECTION

SECTION INCLUDESAbove ground plumbing piping installations including, but not limited to the following:Related sectionsREFERENCESSUBMITTALSComply with Section 01 33 00.Drawings: Comply with Section 22 05 00.

QUALITY ASSURANCEManufacturers: Firms who have been regularly engaged in the manufacture of plumbing pipework systems and whose products have proved satisfactory in similar service for not less than 10 years.Installer: Firms proposed for the installation of the plumbing pipework systems shall have been regularly engaged for at least 5 years in the installation of work of a similar type, quality and scope as is required for the project.

OPERATION AND MAINTENANCE DATAComply with Sections 01 78 23 and 22 05 00.DELIVERY, STORAGE AND HANDLINGAll products shall be delivered in manufacturer's original protective packaging. All products shall be inspected at time of delivery for damage and for compliance with Specifications. Any products that are found to be damaged or not in accordance with...All products shall be handled and stored as recommended by the manufacturer to prevent damage and deterioration. Supply handling equipment such as lifting beams, reinforced canvas slings, protective padding, struts, cradles, etc., required to handle t...Products shall be protected against damage and ambient conditions during transport, site storage and immediately up to the time products are installed. Precautions shall be taken to protect products from mechanical damage and the effects of sunlight a...All pipes shall be stored on purpose-made pipe racks of welded construction and of sufficient strength to support the entire weight of the materials without any noticeable deformation. The racks shall be such that all pipework is clear of the ground.All black steel pipework shall be given one coat of red oxide paint immediately after delivery and prior to storage. The open ends of pipework shall be blanked off with purpose- made or manufactured plugs.Pipe fittings shall be stored within containers made on well-lit compartmented racks or shelves. Fittings shall be separated by means of their type and size and laid out in an orderly manner for ease of identification.

WARRANTY

MATERIALSUnplasticized Polyvinyl Chloride (uPVC) pipework and fittings for soil, waste and vent:uPVC pipework and fittings buried in ground under floor slab shall be in accordance with SASO SAS 14 Class 5.Jointing of buried in ground under floor slab pipework and fittings for uPVC class 5 shall be by the use of solvent weld sockets carried out in accordance with the manufacturers instructions. Solvent weld cement shall be of a type approved by the man...Jointing of aboveground uPVC Class 4 pipework and fittings shall be by rubber ring seal joints. Additional ring seal joints shall be provided as necessary to account for expansion and contraction.

Chlorinated polyvinyl chloride pipework (cPVC):Chlorinated polyvinyl chloride pipework shall be Schedule 80 to ASTM F 439.Joints shall be made using solvent cement to ASTM F 493 as approved by the manufacturer of the pipework being joined.

PART 3: EXECUTIONSOIL, WASTE AND RAIN WATER PIPEWORKMaterials and workmanship shall be of best quality and executed in accordance with the Specification, Drawings and manufacturers recommendations.Where any pipe is required to be shortened, it shall be cut off square and cleanly with an approved pipe-cutting machine.Where special joints or jointing materials are shown for pipes of any materials, they shall be of an approved type and manufacture, and the joint shall be made in accordance with the manufacturer's instructions, or as directed.Responsibility shall be assumed to identify and install all necessary expansion couplings and fire sleeves throughout the installations.All plant, pipes and fittings etc. shall be thoroughly cleaned of all foreign matter before installation. Each section of the installation shall be clean and free from any obstructions whatsoever before proceeding with the next section of the install...Flexible joints shall be provided wherever pipes cross expansion joints.All soil, waste, vent and rainwater pipes shall be to the sizes and positions shown on the Drawings to take the discharge from the branch waste and vent pipes, sanitary fittings and equipment adjacent thereto.On completion, the whole of the work shall be handed over in a sound and clean condition. In the event of any pipe being fractured from any cause whatsoever after having been (to all appearances) properly installed, responsibility shall be assumed in...All pipework shall be erected to present a neat and orderly appearance, arranged parallel to or at right-angles to the structural members of buildings, giving maximum headroom and not to obstruct windows or doorways. Pipework shall be erected such ...Slopes of drainage system (gravity) shall be a minimum of: Foul water and drain pipes within wet areas - 2%; at long runs 1%; and rainwater pipes - 1%.Discharge pipework shall be so installed as to minimize the risk of blockage. Access covers and/or rodding eyes shall be positioned such as to enable maintenance equipment to be inserted into the system(s) to permit cleaning or clearing of all section...Pipework and fittings shall be installed so that broken or defective parts can be easily removed and replaced.Discharge pipework shall be installed such that there is no leakage of contaminated water or foul air into any building.Work shall be set out and responsibility assumed for the accuracy of the same and the position of all fittings shall be approved by the Engineer.Responsibility shall be assumed for leaving all unfinished works in a safe condition during the progress of the works.Vent pipe roof termination:Discharge stacks complete with domical cages shall terminate not less than 300 mm vertically above finished roof level and roof, 900 mm above and not less than 3000 mm, measured horizontally from any window or air conditioner.Where the stack passes through floors, ceilings and roofs, the openings shall be perfectly sealed-off by proprietary fittings. Stacks shall terminate with neoprene aluminum weathering slate, weathering collar and a balloon grating on a 180 degree bend.

All branch waste pipes to a range of fittings shall have an access provided on the pipe in an accessible position at the end of the run.All pipework shall be supported in accordance with the manufacturers recommendations. Pipe hangers and brackets shall be in accordance with Section 22 05 29.Sleeves shall be provided where pipes pass through walls or floors. Pipe sleeves shall be compatible with the pipes they protect; non-combustible and 1.5 times the diameter of the pipe. Void between pipe and pipe sleeve shall be packed with mineral wo...Where plastic pipes 50 mm diameter and larger pass through fire compartment walls, floors or ceiling cavity barriers, they shall be fitted with intumescent collars having the same fire resistance rating as the fire barrier they pass through. Intumesce...All pipe fittings shall be of the same color as the pipework used.All vertical soil and waste pipes shall have access doors on each floor fitted above the spillover level of fittings served. Where pipes are installed in ducts or built into walls, access doors shall be provided in the duct wall or wall for access to ...All traps with outlets for pipes up to and including 50 mm shall have a minimum water seal of 75 mm.Traps with outlets for pipes of over 50 mm shall have a minimum water seal of 50 mm.

Condensate drains shall be provided from all fan coil units, packaged units etc. piped to the nearest floor drain, other suitable drain point or as shown on the Drawings.Self Siphonage Tests: Undertake tests for self-siphonage and induced siphonage in branch discharge pipes by filling each appliance to overflowing and then discharging by removing the plugs and discharging w.c.(s) at the upstream end of the discharge p...Testing and Commissioning:All tests requested by the approving Authority on the entire installation shall be carried out, and all necessary appliances and equipment for this purpose shall be supplied.Provision shall be made to carry out any test requested at any time during the progress of the works or after completion.Whilst phased testing may be carried out (which may or may not have been witnessed) the Contractor shall be required to demonstrate the water tightness, alignment, and level and cleanliness of the whole installation seven days prior to the installatio...All tests shall be carried out in the presence of the Engineer, and a minimum of 48 hours notice shall be given of readiness to test any section of the installation. Test Certificates shall be submitted to the person witnessing the test for their sig...All sections of works shall be pre-tested to satisfy that the system will pass the required test, prior to carrying out the main test.The Test Certificate shall be required to be completed for all sections of the installation.After erection and immediately prior to sealing in, all rainwater, main soil, waste, vent and branch soil, waste pipes, shall be checked throughout for obstructions and finally tested for soundness.The above-ground sanitation and rainwater pipe installation shall be subjected to two air tests, one of 75 mm water gauge for a minimum period of 15 minutes prior to connection of sanitary fittings and building in of pipework, and a second air test on...At start of testing, sanitation and rainwater pipework shall be checked for alignment and stability. Mechanical joints shall be re-torqued where necessary.Access doors shall be removed, felt washers greased and doors replaced.The whole system shall be rodded through with an appropriately sized disc.

POTABLE HOT AND COLD WATER SERVICES PIPEWORKPipework from the water meter to the inside of buildings, where running below ground level shall be HDPE PE-100 PN16. Distribution within buildings shall be cPVC Schedule 80 pipes.Underground pipework shall be laid in 200 mm of sand or stone free bedding material and wherever possible in straight lines to uniform gradients. The clearance between the pipework and footings of the buildings is not to be less than 200 mm. If less, ...All pipework shall run vertically or at an inclination of 1% to the horizontal to enable the whole system to be drained off either through the system or through a valve discharging externally with an air gap to prevent contamination by backflow. When ...Where pipes are run chased into walls, floors, etc., all pipework shall be insulated.All pipework shall be installed to present a neat and orderly appearance, arranged parallel to or at right-angles to the structural members of buildings, giving maximum headroom and shall not obstruct windows or doorways. Pipes shall bend round piers,...All fittings shall, as far as practicable, be the same size as the tubes and pipes connected to them. Bushed outlets shall only be accepted if the required outlet size of a fitting is not of standard manufacture. Eccentric bushings and square tees sha...Elbows shall be used, where practicable, in preference to bends. Square elbows shall not be permitted.Pipework shall follow the contours of walls and shall be graded to ensure venting and draining. Clearance between pipework (or the insulation) and the wall and any other fixtures shall be not less than 20 mm.Purpose-made sets or springs may be used where it is necessary to deviate from a straight run.Sets or springs in tubes of 50 mm size and above shall be fire-made and tubes shall remain circular after setting.Eccentric reducing sockets shall be used where changes of bore are made in runs of nominally horizontal pipework to facilitate air venting and draining.Tubes shall be reamed after cutting and shall be free from burrs, rust scale and other defects and shall be thoroughly cleaned before erection. Open ends left during the progress of work shall be temporarily closed with purpose-made metal or plastic p...All joints between copper and steel pipes shall be made using dielectric couplings. Copper pipework shall not be installed upstream of galvanized steel pipework.Where pipework passes through walls, floors or ceilings, sleeves shall be provided. Pipework passing through flooring shall be provided with approved type floor and ceiling plates fastened securely to the pipe. The sleeves shall be of the same metal a...All entry and exit holes to or from a building for pipework services shall be sealed and plugged. For service conditions below 60 oC, the sealant shall be mastic compound. Above this temperature it shall be silicon rubber. Where the pipework enters th...All pipes shall be secured by appropriate metal clips or brackets to allow for thermal movement and support at spacing not exceeding 300 mm.Pipework of 75 mm size and larger subject to expansion and contraction and hung from supports shall be suspended on swivel hangers unless otherwise approved.Hangers for horizontal pipework shall be supported in accordance with the requirements of Section 22 05 29.Piping that is insulated shall be secured by clips that allow sufficient space behind the back of the pipe for the pipe insulation to be properly installed.All pipework shall be installed so that the vertical distance between the discharge point and overflow level of the receiving appliance shall not be less than 25 mm for taps and/or fittings up to and including 20 mm and 70 mm for those over 20 mm, to ...A 20 mm diameter washout pipe, discharging outside the building shall be provided at ground floor level to drain the system. The top of the outlet shall be greater than 70 mm from the ground or receiver.Double check valve assemblies or other suitable backflow preventers shall be installed on cold water makeup pipes to HVAC equipment and wherever equipment is supplied that may allow backflow.Water hammer arrestors shall be provided on horizontal piping to fixtures and equipment having quick closing valves or flush valves and as shown on the Drawings.Where drinking water and non-potable water supply points are installed, they shall be clearly marked to provide ready identification. Every drinking water point shall be segregated from fire fighting water supply points. Every drinking water pipe shal...All treated water distribution pipework shall separately identified/painted as detailed in Section 09 91 00.All flush water pipework shall be painted brown.System Testing:Ensure that all pipework is watertight to the satisfaction of the Engineer and supply all pressure gauges, meters, hoses, pumps and other temporary supports, equipment and manpower necessary for carrying out pressure tests.During testing, check the satisfactory operation of each valve installed under the Contract.Before filling or pressure testing is started, re-check pipes and valves for cleanliness and re-check the operation of valves. The open ends of the pipes shall normally be stopped off by blank flanges or capped ends additionally secured where necessar...Potable water system shall be tested with water to 1.5 times the normal system working pressure or 6 bar whichever is greater while uncovered but adequately anchored. The testing shall be carried out in sections if necessary. If a section should fail ...The system shall be filled with potable water and all air expelled. After the system has been completely filled, the pressure shall be steadily and gradually increased until the test pressure has been reached. If any loss is recorded, repairs shall be...Written records of every test clearly identifying the tested system together with time of test and name of testing Engineer in tabulated format shall be submitted for review by the Engineer upon completion of the test.

Flushing and Disinfection:All visible dirt and debris shall be removed from the tank.The tank and distributing pipes shall be filled with clean, potable water and then drained until empty of all water.The tank shall be filled with clean potable water and the supply closed.A measured quantity of sodium hypochlorite solution of a known strength shall be added to the water in the tank to give a free residual chlorine concentration of 50 mg/l (50 ppm) in the water.The tank shall be left to stand for 1 hour.Each draw-off fitting shall be successively opened, working progressively away from the tank.Each tap and draw off fitting shall be closed when the water discharged smells of chlorine.The tank shall not be allowed to become empty during this operation. If necessary it shall be refilled and chlorinated as above.The cistern and pipes shall then remain charged for a further 1 hour.The tap furthest from the cistern shall be opened and the level of free residual chlorine in the water discharged from the tap shall be measured. If the concentration of free residual chlorine is less then 30 mg/l (30 ppm) the disinfecting process sha...The tank and pipes shall remain charged for at least 16 hours and then thoroughly flushed out with clean, potable water until the free residual chlorine concentration at the taps is no greater than 21 mg/l (21 ppm).

END OF SECTION

22 11 13 - facility water distribution piping.pdf

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