02668 - Water Distribution System

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    SECTION 02668

    WATER DISTRIBUTION SYSTEM

    1. PART 1 - GENERAL

    1.01 SECTION INCLUDES

    A. Potable, non-potable and fire water distributionsystems from outside buildings and up to interfacepoint(s) with main existing utilities line(s) as shownon Drawings.

    B. Potable and fire water distribution system shallinclude the following:

    1. Pipes and pipe fittings.

    2. Valves.

    3. Piping Specialties.

    4. Water Meter.

    5. Miscellaneous components/materials related to thewater distribution system.

    C. Pumps related to the water distribution system shall bespecified in Section 15160 - PUMPS.

    1.02 REFERENCES

    A. ASTM - American Society for Testing and Materials:

    ASTM A 126 Standard Specification for Gray IronCastings for Valves, Flanges, and PipeFittings

    ASTM A 193/A Specification for Alloy-Steel andstainless Steel Bolting Materials forHigh- Temperature Service

    ASTM A 194/A Specification for Carbon and Alloy-SteelNuts for Bolts for High-pressure and High-Temperature Service

    ASTM B 62 Standard Specification for CompositionBronze or Ounce Metal Castings

    ASTM B 584 Specification for Copper Alloy SandCastings for General Applications

    ASTM D 1785 Specifications for Poly Vinyl Chloride

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    (PVC) Plastic Pipe, Schedules 40, 80, and120

    ASTM D 2467 Socket-Type Poly Vinyl Chloride (PVC)Plastic Pipes Fittings, Schedule 80

    ASTM D 2564 Specifications for Solvents Cements for

    Poly Vinyl Chloride (PVC) Plastic Pipe andFittings

    ASTM D 2855 Making Solvent-Cemented Joints with PolyVinyl Chloride (PVC) Pipes and Fittings

    ASTM F 436 Specifications of Hardened Steel washers

    ASTM D 3139 Joints for Plastic Pressure Pipes UsingFlexible Elastomeric Seals

    B. ANSI - American National Standard Institute

    ANSI B16.5 Steel Pipe Flanges and Flanged Fittings

    C. MSS - Manufacturers Standardization Society

    MSS SP-70 Cast-Iron Gate Valves, Flanged and ThreadedEnds

    MSS SP-71 Cast-Iron Swing Check Valves, Flanged andThreaded Ends

    MSS SP-80 Bronze Gate, Globe, Angle and Check Valves

    D. AWWA - American Water Works Association:

    AWWA C651 Standard for Disinfecting of Water Mains

    AWWA C700 Standard for Cold-Water Meters -Displacement Type

    1.03 SUBMITTALS

    A. Product and Maintenance Data: Submit manufacturer'sproduct and maintenance data for the items specifiedherein.

    B. Coordination Drawings: Prepare and submit coordinationdrawings for water distribution piping.

    1.04 WARRANTY

    A. Provide a written Guarantee covering the satisfactoryoperation of plumbing installations for a period of oneyear from the date of acceptance. During this period,repair providing new materials to replace defective

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    work at no extra cost to the Owner.

    1.05 STORAGE, HANDLING AND TRANSPORTATION

    A. Storage, handling and transportation of pipes, fittingsand adhesive shall be in strict accordance with themanufacturer's written instructions and

    recommendations.

    B. Do not remove valves/meters end protectors unlessnecessary for inspection; then re-install for storage.Protect valves/meters from weather. Store valves/metersindoors. If outdoor storage is necessary, supportvalves/meters off the ground or pavement in watertightenclosures.

    C. Rig valves/meters to avoid damage to exposed valveparts. Do not use handwheels and stems as lifting orrigging points.

    1.06 QUALITY ASSURANCE

    A. Comply with the applicable requirements of the UniformPlumbing Code (UPC) as well as the Standards of ANSIand ASME referred to in this Section.

    B. Single Source Manufacturer: Provide pipes, fittings andflanges for a particular installation from a singlesource to avoid incompatibility due to intermixing ofproducts.

    C. Qualifications of Installer of Piping: Installer shallbe recommended by the piping manufacturer. Installershall be subject to the Engineer approval.

    2. PART 2 - PRODUCTS

    2.01 PIPES AND PIPE FITTINGS

    A. Water distribution pipes and pipe fittings shall beunplasticized polyvinyl chloride (uPVC), schedule 80conforming to ASTM D 1785.

    B. Pipes and Pipe Fittings:

    1. Pipes: Water distribution pipes outside buildingshall be unplasticized polyvinyl chloride (uPVC),schedule 80 conforming to ASTM D 1785 or Class Vconforming to SASO 14 and 15.

    2. Pipe Fittings: Unplasticized polyvinyl chloride(uPVC), schedule 80 conforming to ASTM D 1785,socket type.

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    3. Jointing system: Welded using solvent cementconforming to ASTM D 2564

    2.02 VALVES

    A. Valve Features - General

    1. Valve Design: Rising stem, or rising outside screwand yoke stems. Non-rising stem valves may be usedwhere headroom prevents full extension of risingstems.

    2. Pressure Rating: ANSI Class 150 valves.

    3. Temperature Ratings: As required to suit the systemtemperatures.

    4. Size: Provide valves of same size as upstream pipe,unless otherwise indicated.

    5. Valve Operators:

    a. Handwheels, fastened to valve stem, for valvesother than quarter turn.

    b. Lever handles on quarter turn valves 6-inch andsmaller except for plug valves. Provide plugvalves with square heads; provide one wrenchfor every 10 plug valves.

    6. Valve External Coating: Valves shall have aprotective, anti-corrosive coating consisting of anepoxy-based primer and an epoxy finish topcoat in

    accordance with the following:

    - Prime Coat: Epoxy-based primer,75 microns (DFT)

    - Second Coat: Epoxy hi-build coating, Glossy,125 microns (DFT)

    - Finish Coat: Same as for second coat

    - Color: As selected and approved by theEngineer.

    B. Gate Valves

    1. Gate Valves, 2-Inch and Smaller: MSS SP-80; Class125, body and bonnet of ASTM B 62 cast bronze,threaded or solder ends, solid disc, copper-siliconalloy stem, brass packing gland, Teflon-impregnatedpacking, and malleable iron handwheel. Class 150

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    valves meeting the above specifications may be usedwhere pressure requires or Class 125 are notavailable.

    2. Gate Valves 2-1/2-Inch and Larger: MSS SP-70; Class125 iron body, bronze mounted, with body and bonnetconforming to ASTM A 126, Class B, flanged ends,

    and Teflon impregnated packing and two-piecebacking gland assembly.

    C. Check Valves

    1. Swing Check Valves 2-Inch and Smaller: MSS SP-80;Class 125, cast bronze body and cap conforming toASTM B 62, horizontal swing, Y-pattern, and abronze disc; and having threaded or solder ends.Valve shall be capable of being re-ground while thevalve remains in the line. Class 150 valves meetingthe above specifications may be used where pressurerequires or Class 125 are not available.

    2. Swing Check Valves 2-1/2-Inch and Larger: MSSSP-71; Class 125, cast iron body and bolted capconforming to ASTM A 126, Class B, horizontalswing, with a bronze disc or cast iron disc withbronze disc ring; and flanged ends. Valve shall becapable of being refitted while the valve remainsin the line.

    D. Valves shall be manufactured in accordance with therequirements specified in Section 15100- VALVES.

    2.03 PIPING SPECIALTIES

    A. Pressure Vacuum Breaker Backflow Preventer:

    1. Design: Meets all requirements of IAPMO, USCFoundation for Cross Connection and HydraulicResearch. Designated for minimum weight loss.

    2. All bronze bodies and covers (to ASTM B 584) withbronze vacuum breaker for size 3 inches and 4inches. Corrosion and wear resistance materialsused throughout. Gate valves supplied shall beflanged non-rising stem.

    3. Y-pattern cast iron bodies (to ASTM A 126) withspring loaded modular checks, bronze vacuum breakerhead and trim, and internal epoxy coating for size6 inches through 10 inches. Corrosion and wearresistance materials used throughout. Gate valvessupplied shall be flanged non-rising stem.

    4. Pressure Rating: 150 psi maximum water working

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    pressure.

    5. Temperature Rating: Water temperature from 32oF to

    140oF.

    6. Elastomers (Seat Discs): Nitrile in accordance withASTM D 2000.

    7. Size: Provide valves of same size as upstream pipe,unless otherwise indicated.

    2.04 WATER METER

    A. General: Water meter design shall be in accordance withthe regulations of the Utility Company as well as therequirements of AWWA C700.

    B. Type: Turbine flow water meter.

    C. Measurement Unit: Cubic meter.

    D. Environmental Conditions: Outdoor type, suitable foroperating under the following conditions:

    1. Relative Humidity:

    - Minimum 0 percent.- Maximum 100 percent (condensing).

    2. Temperature:

    - Minimum 0 degrees C.- Maximum 70 degrees C, exposed to direct sun

    radiation with no internal heat source.

    E. Water Meter Construction: Cast iron body shielded frommagnetic fields with flanged ends rated class 150 inaccordance with ANSI B16.5. Rotary vane and measuringmechanism shall be plastic. External body shall beprovided with the Manufacturer's standard high-qualitycorrosion proof coating.

    2.05 MISCELLANEOUS MATERIALS

    A. Marker Tape: Detectable metalic core polyethylene tapecolor-coded, 150 mm wide, 100 microns thick, andlabelled in Arabic and English alternately for theappropriate service.

    B. Water Meter, Valves and Tie-In Points Chambers:

    1. Construction: Cast-in-place reinforced concrete;conforming to Section 03300 - CAST-IN-PLACECONCRETE; Class 30 with Type 1 portland cement.

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    Interior surfaces shall be coated with 2 coats (650micron thick) coal tar epoxy. Exterior surfacesshall have single layer, fully bonded, 4 mm thickwaterproofing membrane and 3 mm thick protectionboard.

    2. Size: As indicated on Drawings.

    3. Chamber Cover/Frame: Conform to the requirementsspecified in Section 05500 - METAL FABRICATIONS.

    3. PART 3 - EXECUTION

    3.01 EXAMINATION

    A. Pipes and Pipe Fittings:

    1. Examine visually pipes and pipe fittings forscratches, damages, cracks, delaminations, crushingand weathering. Damaged pipes and pipe fittingsshall not be installed.

    2. Clean pipes and pipe fittings prior toinstallation.

    3. Discard adhesives and other piping materials thatare beyond their stamped expiry dates as well asleaking and opened containers.

    B. Valves:

    1. Examine valve interior through the end ports forcleanliness, freedom from foreign matter, and

    corrosion. Remove special packing materials used toprevent disc movement during shipping and handling.

    2. Actuate valves through an open-close and close-opencycle. Examine significant features as guides andseats made accessible by such actuation.

    3. Examine mating flange faces for conditions thatmight cause leakage. Check bolting for proper size,length, and material. Check gasket material forproper size, material composition suitable forservice, and freedom from defects and damage.

    4. Replace defective valves with new valves.

    3.02 RELATED WORKS

    A. Trenching and bedding for underground piping shallconform to Section 02225 - TRENCHING AND BACKFILLING.

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    B. Dewatering: Dewatering, where required, shall conformto the requirements of Section 02200 - EARTHWORK.

    C. Pipelines Crossings under Roads: Conform to therequirements of Section 02225 - TRENCHING ANDBACKFILLING

    3.03 INSTALLATION OF PIPING SYSTEM

    A. Installation - General:

    1. Install pipes, fittings, and valves in accordancewith the requirements of AWWA M23.

    2. Inspect pipes, fittings and valves for soundnessand for imperfections of coatings, wrappings andlinings prior to installation.

    3. Deflection at joints shall not exceed the maximumdeflection recommended by the pipe or couplingmanufacturer for each type of joint and each sizeof pipes.

    4. Blocking shall be permitted only where indicated.

    5. Install temporary piping, valves, meters, gauges,and equipment required for hydrostatic testing anddisinfection in accordance with detailed approvedworking drawings.

    B. Pipes and Pipe Fittings:

    1. Assembly of Piping Systems

    a. Assemble adhesive-bonded and gasketed joints instrict accordance with the pipe Manufacturer'srecommendations.

    b. Use heating blankets to cure bonded joints.

    2. Connections between Dissimilar Materials: Provideflanged joints between dissimilar materials.

    3. Laying Piping in Trenches:

    a. Adhesive bonded and gasketed joint piping of250 mm and less may be assembled next to or inthe trench.

    b. For trenches 2 m deep or less, piping assemblednext to trench shall not be moved within threepipe lengths of an uncured joint. Lower theassembled pipeline into the trenchprogressively to avoid excessive joint angular

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    deflection.

    c. For trenches deeper than 2 m, assemble pipes inthe trench.

    C. Anchorage and Buttresses:

    1. Construct concrete anchorage and buttresses whereindicated.

    2. Harness valves and fittings that are not providedwith an anchor, buttress or restrained joint usingsteel rods and rod socket pipe clamps or by steelrods and rod connectors connected to mechanicaljoint bolts as indicated.

    3.04 VALVE INSTALLATION

    A. Locate valves for easy access and provide separatesupports where necessary. Install valves in a positionallowing full stem movement.

    B. Install valves using flanged connections. Align flangesurfaces parallel. Assemble joints in accordance withthe valve manufacturer's recommendations for gasketingand bolting.

    3.05 FIELD QUALITY CONTROL

    A. Hydrostatic Testing:

    1. Underground piping to be tested shall be partiallybackfilled with joints exposed during test unlessotherwise directed by the Engineer.

    2. Protect exposed joints from direct sunlight duringtesting. Perform hydrostatic testing so thattemperature of the test water shall not exceed 40degree C during the test period.

    3. Provide temporary thrust resistance using woodensupports at changes of direction prior tohydrostatic testing of assembled piping.

    4. No adhesive-bonded piping shall be pressurizeduntil joints has cured in accordance with theManufacturer's instructions.

    5. Conduct Hydrostatic tests in presence of theEngineer, and prior to coating joints anddisinfecting. Conduct hydrostatic tests after theassociated concrete works has set for a minimum of7 days for standard concrete.

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    6. Place test pump on firm ground away from piping.Pump shall have a calibrated and tagged reliefvalve set at 10 percent above the test pressure ora maximum of 170 kPa above test pressure forpressure piping systems.

    7. Use a calibrated and tagged pressure gauge of the

    proper range for testing pressure piping systems.

    8. Perform hydrostatic test using fresh water. Fillpipeline 24 hours prior to testing.

    9. Pressure test for the water distribution mainsshall be 1035 kPa (150 psig) or 345 kPa (50 psig)above the operating pressure, whichever is greater.

    a. Test lines whose joints have been backfilled atthe above mentioned pressure test for 24 hours.

    b. Test lines whose joints have not beenbackfilled at the above mentioned pressure testfor 4 hours.

    B. Inspection:

    1. Examine exposed pipes, joints, fittings, valves,and hydrants for leakage during hydrostatictesting.

    2. Replace leaking pipe, joints and fittings inaccordance with the requirements specified herein.

    3. Repeat hydrostatic testing after the repair ofdefects until the system is proved satisfactory.

    4. Piping shall be satisfactory if there is noevidence of leakage or pressure loss after thespecified test period.

    C. Repair Methods:

    1. Conform to the requirements specified herein forthe provision of new materials required forreplacement at the defected areas.

    2. Conform to the manufacturer's recommendations forpermanent and temporary repairs of piping.

    D. PREPARATION AFTER TESTING PASS

    1. After completion of hydrostatic tests, drain linesin an approved manner.

    2. Remove temporary test piping and equipment that

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    will no longer be required.

    3. Field Coating: After completion of hydrostatictests and before disinfecting, prime or re-prime asrequired and provide a protective coating touncoated metal components of piping system,including joints as specified herein, except

    exposed ends of steel pipes up to couplings shallbe wrapped with hot applied coal tar tape.

    3.06 BACKFILL

    A. Trench backfilling shall conform to the requirements ofSection 02225 - TRENCHING AND BACKFILLING.

    B. Marker Tape: Install continuous, marker tape duringbackfilling of trench for underground services. Locatetape 300 mm below finished grade.

    3.07 PREPARATION FOR USE

    A. General:

    1. Disinfection: Disinfect drinking water lines inaccordance with AWWA C651 before placing the linesin service.

    2. Hypochlorite used in RTR piping shall be insolution form.

    B. Disinfection:

    1. Flush the entire water system thoroughly anddisinfect with chlorine before placing the system

    in operation according to the procedures prescribedby the authority having jurisdiction and/ordescribed in the AWWA C651 or as described below:

    a. Fill the system or part thereof with a solutionof water/chlorine containing at least 50 partsper million of chlorine.

    b. Isolate (valve off) the system or part thereofand allow to stand for 24 hours.

    c. Drain the system or part thereof of previoussolution. Refill with a water/chlorine solutioncontaining at least 200 parts per million ofchlorine.

    d. Isolate the system or part thereof and allow tostand for 3 hours.

    e. Following the allowed standing time, flush the

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    system with clean, potable water until chlorinedoes not remain in the water coming from thesystem.

    f. Submit water samples in sterile bottles to theauthority having jurisdiction.

    g. Repeat the procedure if the biologicalexamination made by the authority showsevidence of contamination.

    h. Remove disinfection equipment and temporarypiping after approval of the disinfectiontests.

    i. Submit reports of cleaning and disinfectingactivities.

    3.08 OPERATING TESTS

    A. Operating Tests: Following approval of disinfection,conduct operating tests in the presence of theEngineer/Owner to verify that each valve is in properworking condition.

    END OF SECTION