02668 water dist.system

Specifications

SECTION 02668 - WATER DISTRIBUTION SYSTEM

PART 1 – GENERAL 02668-3/26

1.1 SECTION INCLUDES 02668-3/261.2 REFERENCES 02668-3/261.3 PIPING 02668-6/26

1.3.1 SERVICE LINES 02668-6/261.3.2 SPRINKLER SUPPLY LINES 02668-6/261.3.3 PLASTIC PIPE 02668-6/261.3.4 EXCAVATION, TRENCHING AND

BACKFILLING 02668-6/261.4 SUBMITTALS 02668-6/261.5 WARRANTY 02668-7/261.6 STORAGE, HANDLING AND TRANSPORTATION 02668-7/261.7 QUALITY ASSURANCE 02668-7/26

PART 2 PRODUCTS 02668-8/262.1 PIPES AND PIPE FITTINGS 02668-8/262.2 FITTINGS AND SPECIALS 02668-9/262.3 JOINTS 02668-9/262.4 VALVES

2.4.1 VALVE FEATURES – GENERAL 02668-10/262.4.2 GATE VALVES 02668-10/262.4.3 CHECK VALVES 02668-11/262.4.4 FLOAT VALVES 02668-11/262.4.5 FOOT VALVES 02668-11/262.4.6 FLUSH VALVES 02668-11/262.4.7 DRAIN VALVES 02668-11/262.4.8 PRESSURE REDUCING VALVES 02668-11/26

2.5 PIPING SPECIALTIES 02668-11/262.5.1 WATER HAMMER ARRESER 02668-11/262.5.2 FLEXIBLE CONNECTORS 02668-11/262.5.3 VACUUM BREAKERS 02668-11/262.5.4 PRESSURE VACUUM BREAKER

BACKFLOW PREVENTER 02668-12/262.6 WATER METER 02668-12/262.7 VALVE BOXES 02668-13/262.8 VALVEPITS 02668-13/262.9 FIRE HYDRANTS 02668-13/262.10 MISCELLANEOUS MATERIALS 02668-13/26

2.10.1 MARKER TAPE 02668-13/262.10.2 WATER METER, VALVES AND

TIE-IN POINTS CHAMBER 02668-13/262.10.3 SERVICE CLAMPS 02668-14/262.10.4 CORPORATION STOPS 02668-14/262.10.5 GOOSENECKS 02668-14/262.10.6 SERVICE STOPS 02668-14/26

WATER DISTRIBUTION SYSTEM 02668 - 1/26

Specifications

2.10.7 TAPPING SLEEVES 02668-14/262.10.8 SERVICE BOXES 02668-15/262.10.9 DISINFECTION 02668-15/262.10.10 SEALANT FOR PIPE PENETRATIONS 02668-15/262.10.11 DOMESTIC WATER PUMP 02668-15/26

PART 3 EXECUTION 02668-18/26

3.1 EXAMINATION 02668-18/263.1.1 PIPES AND PIPE FITTINGS 02668-18/263.1.2 VALVES 02668-18/26

3.2 RELATED WORKS 02668-18/263.2.1 TRENCHING AND BEDDING 02668-18/263.2.2 DEWATERING 02668-19/263.2.3 PIPELINES CROSSINGS UNDER ROADS 02668-19/26

3.3 INSTALLATION OF PIPING SYSTEM 02668-19/263.3.1 CUTTING OF PIPE 02668-19/263.3.2 ADJACENT FACILITIES 02668-19/263.3.3 JOINT DEFLECTION 02668-18/263.3.4 PLACING AND LAYING 02668-20/263.3.5 JOINTING 02668-20/263.3.6 SETTING OF FIRE HYDRANTS,

VALVES 02668-22/263.4 HYDROSTATIC TESTS 02668-23/263.5 DISINFECTION 02668-25/26

3.5.1 BACTERIOLOGICAL DISINFECTION 02668-25/263.5.2 LEAD RESIDUAL 02668-26/26

3.6 CLEAN UP 02668-26/26


Specifications

SECTION 02668 - WATER DISTRIBUTION SYSTEM

1. PART 1 - GENERAL

1.1. SECTION INCLUDES

1.1.1. Potable water distribution system from outside buildings and up to interface point(s) with main line(s) as shown on Drawings.

1.1.2. Potable water distribution system which shall include the following:

1.1.2.1. Pipes and pipe fittings.

1.1.2.2. Valves.

1.1.2.3. Piping Specialties.

1.1.2.4. Water Meter.

1.1.2.5. Miscellaneous materials related to the water distribution system.

1.1.3. Pumps related to the water distribution system shall be specified in Section 15453 - PUMPS.

1.2. REFERENCES

SASO - SAUDI ARABIAN STANDARDS ORGANIZATION

SASO 14 Pipes for Potable Water of Unplasticized Plastic (Poly Vinyl Chloride)

SASO15 Methods of Testing of Pipes for Potable Water of Unplasticized Plastic (Polyvinyl Chloride PVC)

SASO 237 Method of Testing for Water Meter

SASO 238 Water Meters

SASO 412 Method of Testing for Cast Iron Manhole Covers

SASO 413 Cast Iron Manhole Covers.


Specifications

ASTM – AMERICAN SOCIETY FOR TESTING AND MATERIALS:

ASTM A 126 Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings

ASTM A 193/A Specification for Alloy-Steel and stainless Steel Bolting Materials for High- Temperature Service

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

ASTM B 62 Standard Specification for Composition Bronze or Ounce Metal Castings

ASTM B 584 Specification for Copper Alloy Sand Castings for General Applications

ASTM D 1599 (1988)Short-Time hydraulic failure pressure of plastic pipe, tubing, and fittings

ASTM D 1785 Specifications for Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120

ASTM D 2241 (1993) Poly (Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series)

ASTM D 2310 Standard Classification for Machine-Made Glass-Fiber-Reinforced-Thermosetting-Resin Pipe

ASTM D 2467 (1993) Socket-Type Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80

ASTM D 2564 Specifications for Solvents Cements for Poly(Vinyl Chloride) (PVC) Plastic Pipe and Fittings

ASTM D 2855 (1993) Making Solvent-Cemented Joints with Poly(Vinyl Chloride) (PVC) Pipe and Fittings

ASTM D 2992 Practice for Obtaining Hydrostatic or Pressure Design Basis for Glass-Fiber-Reinforced-Thermosetting-Resin Pipe and Fittings

ASTM D 2996 Specification for Filament-wound Glass-Fiber-Reinforced-Thermosetting-Resin Pipe

ASTM F 436 Specifications of Hardened Steel washers

ASTM F 477 (1993) Elastomeric Seals (Gaskets) for Joining Plastic Pipe


Specifications

ANSI – AMERICAN NATIONAL STANDARDS INSTITUTE

ANSI B16.5 Steel Pipe Flanges and Flanged Fittings

MSS – MANUFACTURER’S STANDARDIZATION SOCIETY

MSS SP-70 Cast-Iron Gate Valves, Flanged and Threaded Ends

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

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

AWWA – AMERICAN WATERWORKS ASSOCIATION:

AWWA B300 (1992) Hypochlorites

AWWA B301 (1992) Liquid Chlorine

AWWA C500 (1986) Gate Valves for Water and Sewerage Systems

AWWA C502 (1985) Dry-Barrel Fire Hydrants

AW\VA C503 (1988) Wet-Barrel Fire Hydrants

AWWA C504 (1987) Rubber-Seated Butterfly Valves

AWWA C509 (1987) Resilient-Seated Gate Valves for Water and Sewerage Systems

AWWA C606 (1987) Grooved and Shouldered Joints

AWWA C651 (1992) Disinfecting Water Mains

AWWA C700 (1990: C700a) Cold-Water Meters - Displacement Type, Bronze Main Case

AWWA C701 (1988) Cold-Water Meters - Turbine Type, for Customer Service

AWWA C800 (1989) Underground Service Line Valves and Fittings

AWWA C900 (1989; C900a) Polyvinyl Chloride (PVC) Pressure Pipe, 4 In. Through 12 In., for water distribution

AWWA C905 (1988) Polyvinyl Chloride (PVC) Water Transmission Pipe, Nominal Diameters 14 In. Through 36 In.


Specifications

AWWA M23 (1980) Manual: PVC Pipe - Design and Installation

1.3 PIPING

This section covers water service lines, and connections to building service at a point approximately 1.5 m outside buildings and structures to which service is required. The Contractor shall have a copy of the manufacturer’s recommendations for each material or procedure to be utilized available at the construction site at all times.

1.3.1 Service Lines

Piping for water service lines shall be polyvinyl chloride (PVC) plastic. unless otherwise shown or specified.

1.3.2 Sprinkler Supply Lines

Piping for water lines supplying sprinkler systems for building fire protection shall conform to NFPA 24 from the point of connection with the water distribution system to the building 1.5 m line.

1.3.3 Plastic Pipe

All plastic piping system components intended for transportation of potable water shall comply with NSF Std 14 and shall be legibly marked with their symbol.

1.3.4 Excavation, Trenching, and Backfilling

Excavation, trenching, and backfilling shall be in accordance with the applicable provisions of Section 02222 EXCAVATION. TRENCHING, AND BACKFILLING FOR UTILITIES SYSTEMS, except as modified herein.

1.4. SUBMITTALS

Contracting Officer approval is required for submittals with a “GA” designation; submittals having an “FIO” designation are for information only. The following shall be submitted in accordance with Section 01300 SUBMITTAL PROCEDURES:

SD-06 Instructions

Installation; FIO

The manufacturer’s recommendations for each material or procedure to be utilized.

SD-08 Statements

Waste Water Disposal Method: GA.


Specifications

The method proposed for disposal of wastewater from hydrostatic tests and disinfection, prior to performing hydrostatic tests.

Statement of Satisfactory Installation; FIO.

A statement signed by the principal officer of the contracting firm stating that the installation is satisfactory and in accordance with the contract plans and specifications and the manufacturer’s prescribed procedures and techniques, upon completion of the project and before final acceptance.

SD-09 Reports

Bacterial Examination; GA.

Test results from commercial laboratory verifying disinfection.

Product and Maintenance Data: Submit manufacturer's product and maintenance data for the items specified herein.

Coordination Drawings: Prepare and submit coordination drawings for water distribution piping.

1.5 WARRANTY

Provide a written Guarantee covering the satisfactory operation of plumbing installations for a period of one year from the date of acceptance. During this period, repair providing new materials to replace defective work at no extra cost to the Owner.

1.6 STORAGE, HANDLING AND TRANSPORTATION

1.6.1 Storage, handling and transportation of pipes, fittings and adhesive shall be in strict accordance with the manufacturer's written instructions and recommendations.

1.6.2 Do not remove valves/meters end protectors unless necessary for inspection; then re-install for storage. Protect valves/meters from weather. Store valves/meters indoors. If outdoor storage is necessary, support valves/meters off the ground or pavement in watertight enclosures.

1.6.3 Rig valves/meters to avoid damage to exposed valve parts. Do not use handwheels and stems as lifting or rigging points.

1.7. QUALITY ASSURANCE

1.7.1. Comply with the applicable requirements of the Uniform Plumbing Code (UPC) as well as the Standards of ANSI and ASME referred to in this Section.


Specifications

1.7.2. Single Source Manufacturer: Provide pipes, fittings and flanges for a particular installation from a single source to avoid incompatibility due to intermixing of products.

1.7.3. Qualifications of Installer: Installer shall be recommended by the piping manufacturer. Installer shall be subject to the Contracting Officer’s approval.

2.PART 2 - PRODUCTS

2.1. PIPES AND PIPE FITTINGS

2.1.1. Unless indicated otherwise, water supply pipes and socket fittings outside building (up to interface with site utilities) shall be as follows:

2.1.1.1 Pipes: Unplasticized polyvinyl chloride (uPVC) plastic pipes conforming to ASTM D 1785, Schedule 80 or SASO Class V. The pressure rating shall be 0.75 MPa working pressure, 1.15 MPa hydrostatic test pressure for water supply and 1.2 M7Pa working pressure. 1.8 MPa hydrostatic test pressure for fire, unless otherwise shown or specified.

2.1.1.2 Pipe Fittings: Socket-type unplasticized polyvinyl chloride (uPVC) plastic fittings conforming to ASTM D 2467, schedule to match that of pipe.

2.1.2. Jointing System:

a. Pipe Less Than 100 mm Diameter:

(1) Elastomeric-Gasket Joint: Pipe shall conform to dimensional requirements of ASTM D 1785. Schedule 40 with joints meeting the requirements of 0.75 MPa working pressure, 1. 15 MPa hydrostatic test pressure, for water supply and 1.2 MPa working pressure, 1.8 MPa hydrostatic test pressure for fire, unless otherwise shown or specified. or it may be pipe conforming to requirements of ASTM D 2241, elastomeric joint, with the following applications

SDR Maximum Working Pressure Pa

Minimum Hydrostatic Pressure MPa

26 689 91721 827 110317 1034 1379

13.5 1379 1834


Specifications

In additional to the above requirements, the pipe, couplings and fittings shall be hydrostatically tested as required by AWWA C900, and shall conform to iron pipe (I.P.S.) or cast iron outside diameter (ClOD) size dimensions.

b. Pipe 100 mm through 300 mm Diameter: Pipe, couplings and fittings 100 mm through 300 mm diameter shall conform to AWWA C900, Class 150, ClOD pipe dimensions, elastomeric-gasket joint unless otherwise shown or specified

2.2 FITTINGS AND SPECIALS

2.2.1 Polyvinyl Chloride (PVC) Pipe

Fittings and specials shall be iron, bell end in accordance with AWWA C 110, with same pressure rating specified, except that profile of bell may have special dimensions as required by the pipe manufacturer; or may be fittings and specials of the same material as the pipe with elastomeric gaskets, all in conformance with AWWA C900. Iron fittings and specials shall be cement-mortar lined (standard thickness) in accordance with AWWA C 104. Fittings shall be bell and spigot or plain end pipe, or as applicable. Ductile iron compact fittings shall be in accordance with AWWA C 153.

2.3 JOINTS

2.3.1 Plastic Pipe

2.3.1.1 Polyvinyl Chloride Pipe’

Joints, fittings, and couplings shall be as specified for PVC pipe. Joints connecting pipe of differing materials shall be made in accordance with the manufacturer’s recommendations as approved by the Contracting Officer.

2.3.2 Isolation Joints

Isolation joints shall be installed between non-threaded ferrous and nonferrous metallic pipe, fittings and valves. Isolation joints shall consist of a sandwich-type flange isolation gasket of the dielectric type, isolation washers, and isolation sleeves for flange bolts. Isolation gaskets shall be full faced with outside diameter equal to the flange outside diameter. Bolt isolation sleeves shall be full lengths. Units shall be of a shape to prevent metal-to-metal contact of dissimilar metallic piping elements.

a. Sleeve-type couplings shall be used for joining plain end pipe sections. The two couplings shall consist of one steel middle ring, two steel followers, two gaskets, and the necessary steel bolts and nuts to compress the gaskets.

b. Split-sleeve type couplings may be used in aboveground installations when approved in special situations and shall consist of gaskets and a housing in two or more


Specifications

sections with the necessary bolts and nuts.2.4. VALVES

2.4.1. Valve Features - General:

2.4.1.1. Valve Design: Rising stem, or rising outside screw and yoke stems. Non-rising stem valves may be used where headroom prevents full extension of rising stems.

2.4.1.2. Pressure Rating: ANSI Class 150 valves.

2.4.1.3. Temperature Ratings: As required to suit the system temperatures.

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

2.4.1.5. Valve Operators:

2.4.1.5.1. Handwheels, fastened to valve stem, for valves other than quarter turn.

2.4.1.5.2. Lever handles on quarter turn valves 6-inch and smaller except for plug valves. Provide plug valves with square heads; provide one wrench for every 10 plug valves.

2.4.1.6. Valve External Coating: Valves shall have a protective, anti-corrosive coating consisting of an epoxy-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 the Contracting Officer.

2.4.2. Gate Valves:

2.4.2.1. Gate Valves, 2-Inch Smaller: MSS SP-80; Class 125, body and bonnet of ASTM B 62 cast bronze, threaded or solder ends, solid disc, copper-silicon alloy stem, brass packing gland, Teflon-impregnated packing, and malleable iron handwheel. Class 150 valves meeting the above specifications may be used where pressure requires or Class 125 is not available.

2.4.2.2. Gate Valves 2-1/2-Inch and Larger: MSS SP-70; Class 125 iron body, bronze mounted, with body and bonnet conforming to ASTM A 126, Class B, flanged ends, and Teflon impregnated packing and


Specifications

two-piece backing gland assembly.2.4.3. Check Valves:

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

2.4.3.2.Swing Check Valves 2-1/2-Inch and Larger: MSS SP-71; Class 125, cast iron body and bolted cap conforming to ASTM A 126, Class B, horizontal swing, with a bronze disc or cast iron disc with bronze disc ring; and flanged ends. Valve shall be capable of being refitted while the valve remains in the line.

2.4.4 Float Valves: For water level in water system with working pressure up to 1.5 kp/cm² (1.5 bar) shall be bronze gate provided with bronze rod and bronze float ball attachment. The ball shall be made of copper.

2.4.5. Foot Valves: Manufacturer’s standard models, of sizes as shown on the drawings. Operating range pressure shall be up to 34 bar. Non-sticking, brass spool poppet design. Heavy red brass body for maximum strength and No.6 perforation. Brass screen strainer and rubber facing for use with water.

2.4.6. Flush Valves: Automatic flush (drain) valves shall be installed at the end of each lateral in which bubblers are installed and where indicated

2.4.7. Drain Valves: Drain valves shall have bronze bodies and angle hose end valves with composition discs and rising stems, with working pressure of 10.5 kg/cm².

2.4.8. Pressure Reducing Valves: Manufacturer’s standard models, of sizes and rating as indicated on Drawings.

2.5. PIPING SPECIALTIES

2.5.1. Water Hammer Arrester: Bellows type, with stainless steel casing and bellows, pressure rated for 250 psi, tested and certified in accordance with PDI Standard WH - 201. Provide water hammer arrester for each group of toilets/fixtures or as shown on the drawings.

2.5.2. Flexible Connectors: Stainless steel bellows with a woven flexible bronze wire reinforcing protective jacket; rated for 150 psig water working pressure, 250F operating temperature and suitable for up to maximum 19 mm alignment. Connectors shall be a minimum of 300 mm long and have threaded or flanged ends; sweat ends are not acceptable.

2.5.3. Vacuum Breakers: Atmospheric constant pressure or hose-bib type.


Specifications

2.5.4. Pressure Vacuum Breaker Backflow Preventer:

2.5.4.1. Design: Meets all requirements of IAPMO, USC Foundation for Cross Connection and Hydraulic Research. Designated for minimum weight loss.

2.5.4.2. Model, type, size and manufacturer shall be as selected and approved by the Contracting Officer.

2.5.4.3. All bronze bodies and covers (to ASTM B 584) with bronze vacuum breaker for size 3 inches and 4 inches. Corrosion and wear resistance materials used throughout. Gate valves supplied shall be flanged non-rising stem.

2.5.4.4. Y-pattern cast iron bodies (to ASTM A 126) with spring loaded modular checks, bronze vacuum breaker head and trim, and internal epoxy coating for size 6 inches through 10 inches. Corrosion and wear resistance materials used throughout. Gate valves supplied shall be flanged non-rising stem.

2.5.4.5. Pressure Rating: 150 psi maximum water working pressure.

2.5.4.6. Temperature Rating: Water temperature from 32oF to 140oF.

2.5.4.7. Elastomers (Seat Discs): Nitrile in accordance with ASTM D 2000.

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

2.6. WATER METER

2.6.1. General: Water meter design shall be in accordance with the regulations of the Utility Company as well as the requirements of AWWA C700.

2.6.2. Type: Turbine flow water meter.

2.6.3. Measurement Unit: Cubic meter.

2.6.4. Environmental Conditions: Outdoor type, suitable for operating under the following conditions:

2.6.4.1. Relative Humidity:

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

2.6.4.2. Temperature:- Minimum 0 degrees C.


Specifications

- Maximum 70 degrees C, exposed to direct sun radiation with no internal heat source.

2.6.5. Water Meter Construction: Cast iron body shielded from magnetic fields with flanged ends rated class 150 in accordance with ANSI B16.5. Rotary vane and measuring mechanism shall be plastic. External body shall be provided with the Manufacturer's standard high-quality corrosion proof coating.

2.6.6. Meter Boxes: Meter boxes shall be of cast iron or concrete of sufficient size to completely enclose the meter and shut-off valve or service stop. Box height shall extend from invert of the meter to final grade at the meter location. Cover shall be cast iron with the word “WATER” cast in it.

2.7 VALVE BOXES.

Valve boxes shall be cast iron or concrete, except that concrete boxes may be installed only in locations not subjected to vehicular traffic. Cast-iron boxes shall be extension type with slide-type adjustment and with flared base. The minimum thickness of metal shall be 4.8 mm. Concrete boxes shall be the standard product of a manufacturer of precast concrete equipment. The word “WATER” shall be cast in the cover. The box length shall adapt, without full extension, to the depth of cover required over the pipe at the valve location.

2.8 VALVE PITS

Valve pits shall be constructed at locations indicated or as required above and in accordance with the details shown. Concrete shall have compressive strength of 20 MPa in accordance with Section 03300 – CAST-IN-SITU CONCRETE.

2.9 FIRE HYDRANTS

Shall be of cast iron construction UL Listed, FM approved, complying with AWWA C502, 6-inch wet barrel, traffic type. Hydrants shall have two 2-1/2 inch hose nozzles and one having 4-1/2 inch bumper nozzle. Nozzles shall be American National Standard Fire Hose Coupling Screw Thread in accordance with NFPA 1963, and conforming to the requirements of local Fire Department. Each inlet shall have a plug and chain. Units shall be finished in UV resistant red polyester coating, with words both in English and Arabic "FIRE HYDRANT" in raised letters for above ground and epoxy coating for underground portion. Provide isolation valves between hydrant and water mains.

2.10. MISCELLANEOUS MATERIALS

2.10.1. Marker Tape: Detectable metallic cores polyethylene tape color-coded, 150 mm wide, 100 microns thick, and labeled in Arabic and English alternately for the appropriate service.

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


Specifications

2.10.2.1. Construction: Cast-in-place reinforced concrete; conforming to Section 03300 - CAST-IN-PLACE CONCRETE; Class 30 with Type 1 Portland cement modified with microsilica. Interior surfaces shall be coated with 2 coats (650 micron thick) coal tar epoxy. Exterior surfaces shall have single layer, fully bonded, 4 mm thick waterproofing membrane or approved equal and 3 mm thick protection board, complying with Section 07111 –MEMBRANE WATERPROOFING.

2.10.2.2. Size: As indicated on Drawings.

2.10.2.3. Chamber Cover/Frame: Conform to the requirements specified in Section 05500 - METAL FABRICATIONS.

2.10.3 Service Clamps

Service clamps shall have a pressure rating not less than that of the pipe to be connected and shall be either the single or double flattened strap type. Clamps shall have a galvanized malleable-iron body with cadmium plated straps and nuts. Clamps shall have a rubber gasket cemented to the body.

2.10.4 Corporation Stops

Corporation stops shall have standard corporation stop thread conforming to AWWA C800 on the inlet end, with flanged joints, compression pattern flared tube couplings, or wiped joints for connections to goosenecks.

2.10.5 Goosenecks

Copper tubing for gooseneck connections shall conform to the applicable requirements of ASTM B 88, Type K, annealed. Length of cable requirement connections shall be in accordance with standard practice.

2.10.6 Service Stops

Service stops shall be water-works inverted-ground-key type, oval or round flow way, tee handle, without drain. Pipe connections shall be suitable for the type of service pipe used. All parts shall be of bronze with female iron-pipe-size connections or compression-pattern flared tube couplings, and shall be designed for a hydrostatic test pressure not less than 1.375 kPa.

2.10.7 Tapping Sleeves

Tapping sleeves of the sizes indicated for connection to existing main shall be the cast gray, ductile, or malleable-iron, split-sleeve type with flanged or grooved outlet, and with bolts, follower rings and gaskets on each end of the sleeve. Construction shall be suitable for a maximum working pressure of 0.75 MPa for


Specifications

water supply and 1.2 MPa for fire network. Bolts shall have square heads and hexagonal nuts. Longitudinal gaskets and mechanical joints with gaskets shall be as recommended by the manufacturer of the sleeve. When using grooved mechanical tee, it shall consist of an upper housing with full locating collar for rigid positioning which engages a machine-cut hole in pipe. encasing an elastomeric gasket which conforms to the pipe outside diameter around the hole and a lower housing with positioning lugs, secured together during assembly by nuts and bolts as specified, pretorqued to 67.8 Newton meters.

2.10.8 Service Boxes

Service boxes shall be cast iron or concrete and shall be extension service boxes of the length required for the depth of the line, with either screw or slide-type adjustment. The boxes shall have housings of sufficient size to completely cover the service stop or valve and shall be complete with identifying covers.

2.10.9 Disinfection

Chlorinating materials shall conform to the following:

Chlorine, Liquid: AWWA B301.

Hypochlorite Calcium and Sodium: AWWA B300.

2.10.10 Sealant for Pipe Penetrations

Refer to Section 07900 – SEALANTS.

2.10.11 Domestic Water Pumps

2.10.11.1. Furnish and install constant discharge pressure variable speed controlled by frequency converter micro-processor automatic water pressure booster system consisting of diaphragm type pressure tank, centrifugal pumps, power and control panels and instrumentation. The booster pumping system skid mounted set assembled, pre-adjusted and tested at factory on common galvanized steel base frame with anti-vibration pads. Package type booster pumping system shall be of type capacity as shown on the drawings. The booster pumping system shall comply with requirements mentioned herein as minimum.

2.10.11.2. Pumps

Type: Centrifugal vertical multistage in-line

Pump Material of Construction


Specifications

Pump headcover / pump base: Stainless Steel 316

Impeller: Stainless Steel 316 Intermediate Chamber: Stainless Steel 316 Outer Sleeve: Stainless Steel 316 Pump Shaft: AISI 431 Shaft Seal: Mechanical Shaft Seal

2.10.11.3. Motor:

Type: Squirrel Cage T.E.F.C. Insulation Class: IP55

2.10.11.4. Pipe Work & Fittings

Common suction manifold stainless steel AISI 316

Common delivery manifolds stainless steel AISI 316

Isolation Valves (gate valves/butterfly valves/check valves as applicable) shall be as per pump manufacturer’s recommendations.

2.10.11.5. Pressure Tank:

Material of shell: Carbon steel, cold pressed, epoxy coated

Diaphragm: Renewable rubber Max. Working Pressure: 10 bar Size: Minimum 2.5 minutes run time of the

lead pimp:

2.10.11.6. Control Panel:

Heavy Gauge Steel Control Cubicle finished in gloss enamel with lockable door enclosure class IP54 consisting of:

Motor Starter: front control board of the following features:

Operating Buttons:

Pump Status (Status display for all pumps connected)

Zone status (status display for all zones)

Set (set menus for control parameters).

Setting of control parameter for


Specifications

zone/pumps Survey of fault indications. Jump one level backward. Jumps one level forward/store setting. Move one display up in menu Move one display down in menu Start/Stop pumps. LCD-display 2x24 character Indicator lights for operating and fault

indications.

Performance Control:

Stop function when operating at low flow.

Automatic cascade control of the pump

Automatic change over of the lead pumps in operation

Manual operation. Free contact point for BMS (where

required)

Pump And System Monitoring Function:

Minimum and maximum limit for the valve

Pre-pressure measurement Motor protection Clock program: One main circuit

breaker doorlock

Circuit For Automatic Operation Including:

PFU control unit One AUTO. Circuit breaker for each

pump One circuit breaker pilot control. Three (one) contactor for each pump

in star delta (DOL) starter. One contactor for each pump in star

delta starter – switch to VLT One contactor with delay timer for

each pump Over load relay for each pump in star

delta starter only

A set of level switch for dry running protection

One pressure sensor connected to the delivery manifold


Specifications

One VFD for speed control of the lead pump

Fan and outlet filter for cooling VFD

3.PART 3 - EXECUTION

3.1. EXAMINATION

3.1.1. Pipes and Pipe Fittings:

3.1.1.1. Examine visually pipes and pipe fittings for scratches, damages, cracks, delaminations, crushing and weathering. Damaged pipes and pipe fittings shall not be installed.

3.1.1.2. Clean pipes and pipe fittings prior to installation.

3.1.1.3. Discard adhesives and other piping materials that are beyond their stamped expiry dates as well as leaking and opened containers.

3.1.2. Valves:

3.1.2.1. Examine valve interior through the end ports for cleanliness, freedom from foreign matter, and corrosion. Remove special packing materials used to prevent disc movement during shipping and handling.

3.1.2.2. Actuate valves through an open-close and close-open cycle. Examine significant features as guides and seats made accessible by such actuation.

3.1.2.3. Examine mating flange faces for conditions that might cause leakage. Check bolting for proper size, length, and material. Check gasket material for proper size, material composition suitable for service, and freedom from defects and damage.

3.1.2.4. Replace defective valves with new valves.

3.2. RELATED WORKS

3.2.1. Trenching and bedding for underground piping shall conform to Section 02222 – EXCAVATION, TRENCHING AND BACKFILLING FOR UTILITIES SYSTEMS.

3.2.2. Dewatering: Dewatering, where required, shall conform to the requirements of Section 02200 - EARTHWORK.

3.2.3. Pipelines Crossings under Roads: Conform to the requirements of Section 02222 – EXCAVATION, TRENCHING AND BACKFILLING FOR


Specifications

UTILITIES SYSTEMS.

3.3. INSTALLATION OF PIPING SYSTEM

3.3.1 Cutting of Pipe

Cutting of pipe shall be done in a neat and workmanlike manner without damage to the pipe. Unless otherwise recommended by the manufacturer and authorized by the Contracting Officer, cuffing shall be done with an approved type mechanical cutter. Wheel cutter shall be used when practicable. Copper tubing shall be cut square and all burrs shall be removed. Squeeze type mechanical cutters shall not be used for ductile iron.

3.3.2 Adjacent Facilities

3.3.2.1 Sewer Lines

Where the location of the water pipe is not clearly defined in dimensions on the drawings, the water pipe shall not be laid closer horizontally than 3 m from a sewer except where the bottom of the water pipe will be at least 300 mm above the top of the sewer pipe, in which case the water pipe shall not be laid closer horizontally than 1.8 m from the sewer. Where water lines cross under gravity-flow sewer lines, the sewer pipe for a distance of at least 3 m each side of the crossing shall be fully encased in concrete or shall be made of pressure pipe with no joint located within 900 mm horizontally of the crossing. Water lines shall in all cases cross above sewage force mains or inverted siphons and shall be not less than 600 mm above the sewer main. Joints in the sewer main, closer horizontally than 900 mm to the crossing, shall be encased in concrete.3.3.2.2 Water Lines

Water lines shall not be laid in the same trench with sewer lines, gas lines, fuel lines, or electric wiring.

3.3.2.3 Structures

Where water pipe is required to be installed within I m of existing structures, the water pipe shall be sleeved. Care shall be exercised and proper precautions taken during installation of the water pipe. The trench shall be hand excavated to assure that there will be no damage to the structures and no settlement or movement of foundations or footings.

3.3.3 Joint Deflection

3.3.3.1 Flexible Plastic Pipe

Maximum offset in alignment between adjacent pipe joints shall be as recommended by the manufacturer and approved by the Contracting Officer, but in no case shall it exceed 5 degrees.

3.3.4 Placing and Laying


Specifications

Pipe and accessories shall be carefully lowered into the trench by means of derrick, ropes, belt slings, or other authorized equipment. Under no circumstances shall any of the water-line materials be dropped or dumped into the trench. Care shall be taken to avoid abrasion of the pipe coating. Except where necessary in making connections with other lines or as authorized by the Contracting Officer, pipe shall be laid with the bells facing in the direction of laying. The full length of each section of pipe shall rest solidly upon the pipe bed, with recesses excavated to accommodate bells, couplings, and joints. Pipe that has the grade or joint disturbed after laying shall be taken up and relaid. Pipe shall not be laid in water or when trench conditions are unsuitable for the work. Water shall be kept out of the trench until joints are complete. When work is not in progress, open ends of pipe, fittings, and valves shall be securely closed so that no trench water, earth, or other substance will enter the pipes or fittings. Where any part of the coating or lining is damaged, the repair shall be made by the Contractor at his expense in a satisfactory manner. Pipe ends left for future connections shall be valved, plugged, or capped, and anchored, as shown.

3.3.4.1 Plastic Pipe Installation

PVC shall be installed in accordance with AWWA M23.

3.3.4.2 Connection

Where connections are made between new work and existing mains, the connections shall be made by using specials and fittings to suit the actual conditions. Where made under pressure, these connections shall be installed using standard methods as approved by the Contracting Officer. Connections to existing asbestos-cement pipe shall be made in accordance with ACPPA-0l.

3.3.4.3 Penetrations

Pipe passing through walls of valve pits and structures shall be provided with ductile-iron or Schedule 40 steel wall sleeves. Annular space between walls and sleeves shall be filled with rich cement mortar. Annular space between pipe and sleeves shall be filled with mastic.

3.3.4.4 Flanged Pipe

Flanged pipe shall only be installed above ground or with the flanges in valve pits.

3.3.5 Jointing

3.3.5.1 Polyvinyl Chloride (PVC) Plastic Pipe

Joints shall be elastomeric-gasket as specified in AWWA C900. Jointing procedure shall be as specified for pipe less than 100 mm diameter with configuration using elastomeric ring gasket.


Specifications

3.3.5.2 Isolation Joints and Dielectric Fittings

Isolation joints and dielectric fittings shall be installed in accordance with details specified in paragraph JOINTS. Dielectric unions shall be encapsulated in a field-poured coal-tar covering, with at least 3.2 mm thickness of coal tar over all fitting surfaces.

3.3.5.3 Connections

Connections between different types of pipe and accessories shall be made with transition fittings approved by the Contracting Officer.

3.3.5.4 Service Lines

Service lines shall include the pipeline connecting building piping to water distribution lines to the connections with the building service at a point approximately 1.5 m outside the building where such building service exists. Where building services are not installed. the Contractor shall terminate the service lines approximately 1.5 m from the site of the proposed building at a point designated by the Contracting Officer. Such service lines shall be closed with plugs or caps. All service stops and valves shall be provided with service boxes. Service lines shall be constructed in accordance with the following requirements:

3.3.5.5 Service Lines 50 mm and Smaller

Service lines 50 mm and smaller shall be connected to the main by a directly-tapped corporation stop or by a service clamp. A corporation stop and a copper gooseneck shall be provided with either type of connection. Maximum sizes for directly-tapped corporation stops and for outlets with service clamps shall be as in TABLE I. Where 2 or more gooseneck connections to the main are required for an individual service, such connections shall be made with standard branch connections. The total clear area of the branches shall be at least equal to the clear area of the service which they are to supply.

TABLE I. SIZE OF CORPORATION STOPS AND OUTLETS

Pipe size mm Corporation stops, mm for Ductile-Iron Pipe

Outlets w/Service Clamps, mm Single & Double Strap

80 -- 25100 25 25150 32 40200 40 50250 40 50

300 and larger 50 503.3.5.6 Service Lines 40mm and Smaller

Service lines 40 mm and smaller shall have a service stop.

3.3.5.7 Service Lines 50mm in Size


Specifications

Service lines 50 mm in size shall have a gate valve.

3.3.5.8 Service Lines Larger than 50mm

Service lines larger than 50 mm shall be connected to the main by a tapped saddle, tapping sleeve and valve, service clamp or reducing tee, depending on the main diameter and the service line diameter, and shall have a gate valve. Lines 80 mm and larger may use rubber-seated butterfly valves as specified above, or gate valves.

3.3.5.9 Service Lines for Sprinkler Supplies

Water service lines used to supply building sprinkler systems for fire protection shall be connected to the water distribution main in accordance with NFPA 24.

3.3.6 Setting of Fire Hydrants, Valves and Valve Boxes

3.3.6.1 Fire Hydrants

Fire hydrants shall be located and installed as shown. Each hydrant shall be connected to the main with a 150 mm branch line having at least as much cover as the distribution main. Hydrants shall be set plumb with pumper nozzle facing the roadway, with the center of the lowest outlet not less than 450 mm above the finished surrounding grade, and the operating nut not more than 1.2 m above the finished surrounding grade. Fire hydrants designated on the drawings as low profile shall have the lowest outlet not less than 450 mm above the finished surrounding grade, the top of the hydrant not more than 600 mm above the finished surrounding grade. Except where approved otherwise, the backfill around hydrants shall be thoroughly compacted to the finished gradeline immediately after installation to obtain beneficial use of the hydrant as soon as practicable. The hydrant shall be set upon a slab of concrete not less than 100 mm thick and 400 mm square. Not less than 2 cubic meters of free-draining broken stone or gravel shall be placed around and beneath the waste opening of dry barrel hydrants to ensure drainage.

3.3.6.2 Valves

After delivery, valves, including those in hydrants, shall be drained to prevent freezing and shall have the interiors cleaned of all foreign matter before installation. Stuffing boxes shall be tightened and hydrants and valves shall be fully opened and fully closed to ensure that all parts are in working condition. Check, pressure reducing, vacuum, and air relief valves shall be installed in valve pits. Valves and valve boxes shall be installed where shown or specified, and shall be Set plumb. Valve boxes shall be centered on the valves. Boxes shall be installed over each outside gate valve unless otherwise shown. Where feasible, valves shall be located outside the area of roads and streets. Earth fill shall be carefully tamped around each valve box or pit to a distance of 1.2 in on all sides of the box, or the undisturbed trench face if less than 1.2 in.


Specifications

3.3.6.3 Service Boxes

Where water lines are located below paved streets having curbs. the boxes shall be installed directly back of the curbs. Where no curbing exists, service boxes shall be installed in accessible locations, beyond the limits of Street surfacing, walks and driveways.

3.3.6.4 Tapped Tees and Crosses

Tapped tees and crosses for future connections shall be installed where shown.

3.3.6.5 Thrust Restraint

Plugs, caps, tees and bends deflecting 11-1/4 degrees or more, either vertically or horizontally, on waterlines 100 mm in diameter or larger, and fire hydrants shall be provided with thrust restraints. Valves shall be securely anchored or shall be provided with thrust restraints to prevent movement. Thrust restraints shall be either thrust blocks or, for ductile-iron pipes, restrained joints.

3.3.6.6 Thrust Blocks

Thrust blocking shall be concrete of a mix not leaner than: 1 cement, 2-1/2 sand, 5 gravel; and having a compressive strength of not less than 15 MPa after 28 days. Blocking shall be placed between solid ground and the hydrant or fitting to be anchored. Unless otherwise indicated or directed, the base and thrust bearing sides of thrust blocks shall be poured directly against undisturbed earth. The sides of thrust blocks not subject to thrust may be poured against forms. The area of bearing shall be as shown or as directed. Blocking shall be placed so that the fitting joints will be accessible for repair. Steel rods arid clamps, protected by galvanizing or by coating with bituminous paint, shall he used to anchor vertical down bends into gravity thrust blocks.

3.3 6.7 Restrained Joints

For ductile-iron pipe, restrained joints shall be designed by the Contractor or the pipe manufacturer in accordance with DIPRA-0 I.

3.4 HYDROSTATIC TESTS

Where any section of a water line is provided with concrete thrust blocking for fitting or hydrants, the hydrostatic tests shall not be made until at least 5 days after installation of the concrete thrust blocking, unless otherwise approved.3.4.1 Pressure Test

After the pipe is laid, the joints completed, fire hydrants permanently installed, and the trench partially backfilled leaving the joints exposed for examination, the newly laid piping or any valved Section of piping shall, unless otherwise specified, be subjected for 1 hour to a hydrostatic pressure test of 1.15 MPa for water supply and 1.8 MPa for fire fighting


Specifications

network. Each valve shall be opened and closed several times during the test. Exposed pipe. joints, fittings. hydrants. and valves shall be carefully examined during the partially open trench test. Joints showing visible leakage shall be replaced or remade as necessary. Cracked or defective pipe, joints, fittings. hydrants and valves, discovered in consequence of this pressure test shall be removed and replaced with sound material, and the test shall be repeated until the test results are satisfactory. The requirement for the joints to remain exposed for the hydrostatic tests may be waived by the Contracting Officer when one or more of the following conditions is encountered:

a. Wet or unstable soil conditions in the trench.

b. Compliance would require maintaining barricades and walkways around and across an open trench in a heavily used area that would require continuous surveillance to assure safe conditions.

c. Maintaining the trench in an open condition would delay completion of the contract.

The Contractor may request a waiver, setting forth in writing the reasons for the request and stating the alternative procedure proposed to comply with the required hydrostatic tests. Backfill placed prior to the tests shall be placed in accordance with the requirements of Section 02222 EXCAVATION, TRENCHING, AND BACKFILLING FOR UTILITIES SYSTEMS.

3.4.2 Leakage Test

Leakage test shall be conducted after the pressure tests have been satisfactorily completed. The duration of each leakage test shall be at least 2 hours, and during the test the pipes shall be subjected to not less than 1.15 MPa pressure for the water supply and 1.8 MPa for the fire network. Leakage is defined as the quantity of water to be supplied into the newly laid pipe, or any valved or approved section thereof, necessary to maintain pressure within 35 kPa of the specified leakage test pressure after the pipe has been filled with water and the air expelled. No piping installation will be accepted if leakage exceeds the allowable leakage which is determined by the following formula:

L = 0.0001351ND(P raised to 1/2 power)

L = Allowable leakage in gallons per hour N = Number of joints in the length of pipeline tested D = Nominal diameter of the pipe in inches P Average test pressure during the leakage test, in psi gauge

Should any test of pipe disclose leakage greater than that calculated by the above formula, the defective joints shall be’ located and repaired until the leakage is within the specified allowance, without additional cost to the User.3.4.3 Time for Making Test

Except for joint material setting or where concrete thrust blocks necessitate a 5-day delay, pipelines jointed with rubber gaskets, mechanical or push-on joints, or couplings may be subjected to hydrostatic pressure, inspected, and tested for leakage at any time after partial


Specifications

completion of backfill. Cement-mortar lined pipe may be filled with water as recommended by the manufacturer before being subjected to the pressure test and subsequent leakage test.

3.4.4 Concurrent Hydrostatic Tests

The Contractor may elect to conduct the hydrostatic tests using either or both of the following procedures. Regardless of the sequence of tests employed, the results of pressure tests, leakage tests, and disinfection shall be satisfactory as specified. All replacement, repair or retesting required shall be accomplished by the Contractor at no additional cost to the User.

a. Pressure test and leakage test may be conducted concurrently.

b. Hydrostatic tests and disinfection may be conducted concurrently, using the water treated for disinfection to accomplish the hydrostatic tests. If water is lost when treated for disinfection and air is admitted to the unit being tested, or if any repair procedure results in contamination of the unit, disinfection shall be reaccomplished.

3.5 DISINFECTION

3.5.1 Bacteriological Disinfection

Before acceptance of potable water operation, each unit of completed waterline shall be disinfected as specified herein. After pressure tests have been made, the unit to be disinfected shall be thoroughly flushed with water until all entrained dirt and mud have been removed before introducing the chlorinating material. The chlorinating material shall be either liquid chlorine, calcium Hypochlorite. or sodium Hypochlorite conforming to paragraph MISCELLANEOUS ITEMS. The chlorinating material shall provide a dosage of not less than 50 ppm and shall be introduced into the water lines in an approved manner. Polyvinyl Chloride (PVC) pipe lines shall be chlorinated using only the above specified chlorinating material in solution. In no case will the agent be introduced into the line in a dry solid state. The treated water shall be retained in the pipe long enough to destroy all non-spore-forming bacteria. Except where a shorter period is approved, the retention time shall be at least 24 hours and shall produce not less than 25 ppm of free chlorine residual throughout the line at the end of the retention period. All valves on the lines being disinfected shall be opened and closed several times during the contact period. The line shall then be flushed with clean water until the residual chlorine is reduced to less than 1.0 ppm. During the flushing period, each fire hydrant on the line shall be opened and closed several times. From several points in the unit, personnel from the Contractor’s commercial laboratory shall take at least 3 water samples from different points, approved by the Contracting Officer, in proper sterilized containers and perform a bacterial examination in accordance with state approved methods. The commercial laboratory must be certified by the state’s approving authority for examination of potable water. The disinfection shall be repeated until tests indicate the absence of pollution for at least 2 full days. The unit will not be accepted until satisfactory bacteriological results have been obtained.

3.5.2 Lead Residual


Specifications

Following the bacteriological disinfection and testing, the system shall be flushed with a sufficient velocity of water and sufficient tests performed at each hot- and cold-water discharge point until no less than 15 ppb lead residuals remain in the system. All tests and samples shall be performed in accordance with state and, if applicable, Federal regulations. Samples for testing are to be collected after a 6-hour continuous period of no flushing, and will be considered first draw samples. The commercial laboratory must be certified by the state’s approving authority for examination of potable water. Lead residual test results are to be submitted to the Contracting Officer. The system will not be accepted until satisfactory bacteriological results and lead residual test results have been obtained. All flushing and testing for lead residuals, including all costs, are the responsibility of the Contractor.

3.6 CLEANUP

Upon completion of the installation of water lines, and appurtenances, all debris and surplus materials resulting from the work shall be removed.

END OF SECTION


02668 water dist.system

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