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    SECTION 15120 - WATER DISTRIBUTION SYSTEM

    PART 1 - GENERAL

    0.1 DESCRIPTION

    A. This Section covers all interior domestic cold water, domestic hot water, domestic hot waterreturn, laboratory cold water, laboratory hot water, laboratory hot water return, nonpotable coldwater, and tempered water piping systems to a point 5 ft outside building wall.

    0.2 RELATED WORK

    A. Section 15015 - Excavation and Backfill.

    B. Section 15020 - Mechanical Supporting Devices.

    C. Section 15030 - Mechanical Systems Insulation.

    D. Section 15160 - Plumbing Material Specialties.

    0.3 REFERENCE

    A. The Work under this section is subject to requirements of the Contract Documents includingthe General Conditions, Supplementary Conditions, and sections under Division 1 GeneralRequirements.

    0.4 QUALITY ASSURANCE

    A. Order pipe with each length marked with manufacturer's name or trademark and type of pipe;with each shipping unit marked with the purchase order number, metal or alloy designation,temper, size, and supplier's name.

    B. Installed material not meeting specification requirements must be replaced with material that

    meets these specifications without additional cost to Owner.

    0.5 DELIVERY, STORAGE, AND HANDLING

    A. Promptly inspect shipments to ensure material is undamaged and complies with specifications.

    B. Cover pipe to prevent corrosion or deterioration while allowing sufficient ventilation to avoidcondensation. Do not store materials directly on grade. Protect pipe, tube, and fitting endsfrom damage. End caps shall remain in place. Protect fittings, flanges, and unions by storageinside or by durable, waterproof, above ground packaging.

    C. Offsite storage agreements will not relieve Contractor from using proper storage techniques.

    D. Storage and protection methods must allow inspection to verify products.

    E. Before shipping, piping shall be cleaned, free of rust and scale, and chemically treated toprotect inside of pipe from rusting, and furnished with end caps.

    0.6 SUBMITTALS

    A. Manufacturer's technical data for the following:

    1. Pipe

    2. Fittings

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    3. Joints

    4. Valves

    5. Unions

    6. Dielectric fittings

    7. Water hammer arrestors

    8. Expansion joints

    B. Shop drawings on items specified herein.

    PART 2 - PRODUCTS

    0.7 MATERIALS

    A. Materials herein specified shall be new unless otherwise noted.

    0.8 PIPE, FITTINGS, AND JOINTS

    A. Above Ground:

    1. Copper (2-1/2 and Smaller):

    a. Pipe: Copper tube, Type K, hard drawn, ASTM B88.

    b. Fittings:

    1) Cast bronze, solder joint, pressure rated, ANSI B16.18.

    2) Wrought copper, solder joint, pressure rated, ANSI B16.22.

    c. Joints: Lead free (

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    1. Acceptable manufacturers: Apollo/Conbraco, Crane, Hammond, Milwaukee, Nibco,Stockham, Velan, and Watts with indicated features and equal to model listed. Note thatnot all manufacturers make all sizes.

    a. Full Port, 2 Piece: Bronze body, ASTM B584, stainless steel ball, teflon seats, stemextension, 600 psi WOG pressure rating, Apollo Series 77-240

    b. Full Port, 3 Piece: Bronze body, ASTM B584, stainless steel ball, teflon seats, stem

    extension, 600 psi WOG pressure rating, Apollo Series 82-240c. Extended Insulated Handle: For insulated systems to prevent condensation on the

    valve body with thermal and vapor seal, equal to Nibco Nib Seal, extended handle.

    d. Lockable Handle: For emergency fixture water supply systems, with lock keyed tofacility standards.

    e. Actuated Valves: Apollo series 77-AR8-64 full port ball valve with stainless steel balland stem, actuator ready with ISO mounting pad, series AE80010 actuator, 115 VAC,two SPDT switches, high limit and thermal overload protection, hardened steel gears,NEMA 4 enclosure, valve position indicator, series 78153801 stainless steel mountingkit. Alternate manufactures may be Nibco or Valvcon V-series, or Emerson Hytork,with actuator to match valve based on a 100 PSI supply condition of 50 degree Fclean fluid, 85 degree F ambient temperature, and infrequent operation of less thanonce per year. Actuator breakaway torque shall be at least 20% greater than stall

    torque. Breakaway torque shall accommodate twice the highest required operationaltorque for the valve to accommodate infrequent operation, and minimum duty cycle of25%. Actuator closer time shall be a minimum of 5 seconds to a maximum of 25seconds cycle time from full open to full closed.

    2. Butterfly Valves:

    a. Acceptable Manufacturers: Dezurik, Pratt, or Mueller.

    b. Lug Type, Size 3-inch and Larger: AWWA C504 type, ductile iron body, stainlesssteel disc, EPDM liner, 316 stainless steel stem, NBR seat, Class 150, lever handlethrough 6", gear operator 8" and larger.

    c. Actuated Valves: As above, but furnished for actuator mounting, factory packagedwith actuator. Actuator shall be 115 VAC, two SPDT switches, high limit and thermaloverload protection, hardened steel gears, NEMA 4 enclosure, valve position indicator,

    and required mounting kit. Alternate manufactures may be Valvcon or EmersonHytork. Sizing shall be based on a 100 PSI supply condition of 50 degree F cleanfluid, 85 degree F ambient temperature, and infrequent operation of less than once peryear. Actuator breakaway torque shall be at least 20% greater than stall torque.Breakaway torque shall accommodate twice the highest required operational torque forthe valve to accommodate infrequent operation, and minimum duty cycle of 25%.

    Actuator closer time shall be a minimum of 5 seconds to a maximum of 30 secondscycle time from full open to full closed.

    3. Gate Valves:

    a. Acceptable Manufacturers: American Flow Control, Clow, Kennedy, Mueller, M&H, orWatts.

    b. Size 3-inch and Larger: Commercial duty, OS&Y or NRS pattern, AWWA C-509,ASTM A-126 Grade B iron body, bronze and stainless steel trim, bronze or stainless

    steel stem, bolted bonnet, flanged ends, bi-directional flow, resilient solid wedgebronze disc, gland packed, 150 PSI working pressure at 140-degrees F. Bubble tightclosure, no seat rings. Anti-friction thrust bearing. Double o-ring stuffing box, with twoo-rings located above thrust collar and third o-ring below collar to permit service in-lineunder pressure. ASTM A-307 bolts and nuts. Valve shall be bottom wedging type withtwo part floating wedge contact per wedge. No side wedging. Rubber to iron bond ondiscs inspected per AASTM D429. Provide with FDA approved epoxy coated interioror equivalent heat-fused epoxy. Epoxy coating shall be applied over a properlyprepared and cleaned surface. Cast iron wheel handle. NSF-61 compliant. Kennedy

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    series Ken-Seal II or approved equal American Flow Control, Clow, Mueller, M&H, orWatts. Valves on combined water service lines shall be UL and FM listed, and shallbe provided with tamper switch as specified in Section 15280

    C. Check Valves:

    1. Size 3" and Smaller:

    a. Bronze body, ASTM B62, Y pattern, Buna-N resilient disc, horizontal swing, 200 psiWOG rating, Nibco 413.

    2. Valves 4" and Larger:

    a. Iron body, horizontal swing, cast bronze disc and seat, 200 psi WOG rating, Nibco F-918.

    3. Valves 2" and Smaller:

    a. Bronze body, ASTM B62, in-line lift type with spring, Buna-N disc, 250 psi WOGrating, Nibco 480.

    4. Valves 2-1/2" and Larger:

    a. Iron body, bronze seat with Buna-N, bronze disc, in-line type with spring, 250 psi WOGrating, Nibco W960.

    5. Size 1/2" thru 2":

    a. Stainless steel body, in-line pattern, stainless steel seats, spring and valve disc.Durabla Basic Check, Model BSS, rated for 300 psi WSP.

    b. Manufacturers: Nibco, Watts, Mission, Durabla, Circle Seal, Milwaukee, Stockham.

    D. Balancing Valves:

    1. Acceptable Manufacturers: Nibco, Victaulic, or Tour and Anderson.

    2. Brass balancing valve with hand wheel with tamper-proof memory feature, Y-pattern withdifferential test ports. Components NSF listed for potable water. Tour & Handerson/TAHydronics series TBV-S or STAD/STAS, or equal Nibco or Victaulic Manufacturing.Pressure class selection appropriate for system working pressure.

    E. Solenoid Valves:

    1. General service 2-way solenoid valve with brass body, PTFE seals and NBR discs, NEMA-1 enclosure, and 120 volts. ASCO 8221 series slow closing, anti-water hammer, Exp.proof/watertight, size to match piping. Coordinate power connection with ElectricalContractor. Fail close or fail open as indicated on drawings.

    0.11 DIELECTRIC FITTINGS

    A. Insulating nipple, metal casing, inert thermoplastic lining, Clearflow dielectric fitting byPerfection Corporation.

    B. Dielectric unions 2" and smaller; dielectric flanges 2" and larger; with iron female pipe thread tocopper solder joint or brass female pipe thread end connections, non-asbestos gaskets,insulators and bolt kits, and pressure rating of not less than 175 psig at 180 degrees. WattsRegulator Company, Lochinvar, Wilkins or Epco Sales, Inc.

    0.12 WATER HAMMER ARRESTORS

    A. Mechanical Water Hammer Arrestors:

    1. Piston-compressed air column type, with sealed air chamber.

    2. Manufacturers: Watts, Sioux-Chief, and Precision Plumbing Products (PPP), Inc., equal tosize shown. Provide access panels when mechanical shockstops are installed in non-accessible concealed locations.

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    0.13 EXPANSION JOINTS/LOOPS

    A. Galvanized steel pipe, Schedule 40, with mechanical couplings, Victaulic 150 Mover.

    B. Copper Piping:

    1. Use expansion loops where space is available. Size expansion loops as listed in thefollowing table:

    Pipe Size Length of Each Loop Number of Legs

    3/4" 38" 3

    1" 40" 3

    1-1/4" 42" 3

    1-1/2" 46" 3

    2" 50" 3

    2-1/2" 54" 3

    3" 60" 3

    4" 68" 3

    C. Copper Piping:

    1. Mechanical expansion fittings, size 3/4" thru 4", copper tube sweat ends, stainless steellaminated internal bellows, 200 psig working pressure, 600F rated; Keflex Model 7QT.

    2. Mechanical expansion fittings, sizes 3/4" thru 4", copper tube sweat ends, stainless steellaminated internal bellows, 175 psi working pressure, 500F rated, Hyspan Model 8509or 8510.

    3. Allowable length of copper tube per mechanical expansion fitting shall be in accordancewith the following table:

    System Operating Temperature Length of Pipe

    110F 300 ft

    120F 275 ft

    130F 250 ft

    140F 225 ft

    150F 175 ft

    160F 175 ft

    170F 150 ft

    180F 140 ft

    D. Pre-manufactured expansion loop will be allowed: Metraflex Model MLS Series for sweatends, MLT Series for threaded ends and MLF Series for flanged or groove ends. Verify pipesize required, laying length, and face-to-face dimension required. Coordinate location withother trades. All expansion joints shall comply with NSF-61.

    0.14 Domestic Water Booster Pump

    A. Manufacturers: Sycroflo, Aurora, Goulds, Peerless, orFairbanks Morse.Tigerflow Systems

    B. General: New pumps provided to replace original pumps on an existing skid. Control panel tobe replaced as necessary for the reconfiguration of the pumps lead/lag sequence.Because ofthe pump package changing from constant speed to a Variable Frequency Drive, the entirepump skid is to be replaced with a new packaged system, as scheduled on the drawings.

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    C. Pumps: Pumps shall be close coupled end suction, cast iron bowls, cast bronze, dynamicallybalanced impellers, wear rings, stainless steel shafts, and water-lubricated bronze radialbearings located directly above and below each impeller. Pump bowls shall be permanentlylined with baked porcelain enamel. Discharge heads shall be of cast iron with stuffing boxesrated for 300 PSIG discharge pressure. Sealing of pump liquid cavity shall be with fact typemechanical seals with Ni-resist/ ceramic stationary seat, carbon-sealing washer, Buna rubberflexible members, stainless steel trim. Seal shall be rated for 225-degrees F at 300 PSIG, andshall be mounted over a bronze shaft sleeve. A coupling with OSHA approved coupling guardshall be provided between the shaft and driver. Maximum pump speed 1750 RPM. Each pumpand motor to have nameplate listing manufacturers name, pump serial number, capacity inGPM and feet of head at design conditions, motor horsepower, voltage, frequency, speed andfull load current. Pumps shall have flexible suction and discharge braided pipe connectors, ofstainless steel construction or otherwise compliant with NSF-61, suction and dischargepressure gauges with gauge cocks, and common thermal relief valve. Discharge from reliefvalve shall be piped to 3 above floor at floor drain. Each pump shall be as manufactured by

    Aurora, Peerless, Fairbanks Morse, or Goulds.

    1. Lead Pump: ((100)) GPM

    2. Lag Pump #1: ((225)) GPM

    3. Lag Pump #2: ((225)) GPM

    4. Total Dynamic Head, (Discharge): ((113))-ft

    D. Pumps may be vertical multistage pumps, 304 stainless steel housing and impellers , orotherwise NSF-61 compliant.

    E. Valves: Include pump isolation valves and silent check valves such that each pump may beserviced with alternate pumps in operation. Provide isolation valves on both suction anddischarge side of each pump. Valves shall be full port 3-piece ball valves or lug style butterflyvalves, suitable for potable water. All valve trim shall stainless steel. All valves shall becapable of bi-directional flow, as well as throttling service. Butterfly valve sizes 6-inch andlarger shall include a traveling nut actuator with handwheel. Valve disk and stem shall bestainless steel, with EPDM seals.

    F. Motors: Electric motors shall be NEMA design B, squirrel cage induction motors, having

    starting torque or breakdown torque not less than value specified in NEMA Standard MG-1.Each motor shall have a minimum NEMA nominal efficiency ration of 92% and 1.15 servicefactor. All motors shall be premium efficiency type, rated for use with inverters in pumpingapplications. Motors shall not be loaded beyond their nameplate rating at any designcondition, or more than 105% at any point within the operating range. Motors shall be fittedwith lifting lugs or eyes.

    G. Control/Operator Interface/ Sequencing: Provide a programmable logic controller to control allpump starts and stops and indicate alarm conditions. A nonvolatile memory with no batterybackup shall prevent program loss due to power failure. Pumps shall be sequenced by leadflow sensing and back-up pressure transducer, prewired at the pump skid. PLC Unit shallinclude alarm horn, pressure and VFD speed sequencing, 40 character 2-line operatorinterface, field adjustable set points, full voltage non reversing IEC starters, circuit protection,EEPROM memory, battery backup for all settings. Unit shall be factory tested. The followingfeatures shall be included:

    1. Magnetic starter for each motor.

    2. Door interlock disconnect.

    3. H-O-A switch for each pump.

    4. Control circuit transformer with protected secondary.

    5. Automatic Alternation.

    6. Lag Pump exercise.

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    7. Sequential pump start and stop.

    8. Time delays.

    9. Minimum run timers and stop delay.

    10. Adjustable solid-state current sensing relays.

    11. Low suction pressure cutout.

    12. High suction pressure shutdown.13. Two sensor differential temperature no-flow shutdown.

    14. Pump operation and warning lights, and alarm horn.

    15. Auxiliary dry contacts for connection of General Fault signal to Building AutomationSystem.

    H. Basis of Design: Sycroflow Custom series.

    0.15 STRAINERS:

    A. 2-1/2-inch and larger: FDA compliant epoxy coated interior, ductile iron or 304 stainless steelbody wye-strainer with 304 stainless steel 1/16-inch screen. Watts 77-DI-FDA, Mueller,Kennedy, or approved equal.

    PART 3 - EXECUTION

    0.16 INSTALLATION

    A. Install pipe and fittings in accordance with reference standards, manufacturer'srecommendations and recognized industry practices.

    B. Maintain piping system in clean condition during installation. Remove dirt and debris fromassembly of piping as work progresses. Cap open pipe ends where left unattended or subjectto contamination.

    C. Include connections to plumbing fixtures, to equipment by others, and to equipment requiringwater. Provide proper backflow and back siphonage protection to safeguard potable water

    system from contamination.

    D. Lay out water system so as to conform to intent of drawings. Coordinate piping with buildingfeatures and work of other trades. Plans indicate, general routing, provide additional offsets asrequired. Install piping with necessary swing joints and offsets to allow for expansion. Installshut-off valves on branch lines near mains to avoid long dead-leg branches when valves areclosed. Install water piping plumb and square with building. Pitch water pipe to drain withdrain valves at low points.

    E. Install shut-off valves where indicated and at base of risers to allow isolation of portions ofsystem for repair. Do not install water piping within exterior walls.

    F. Provide protective sleeve covering of elastomeric pipe insulation where copper or steel pipingis embedded in masonry or concrete

    G. Provide dielectric fittings between dissimilar piping materials.

    H. Do not route piping through transformer vaults or above transformers, panelboards, orswitchboards, including the required service space for this equipment, unless piping is servingthis equipment.

    I. Install all valves and piping specialties, including items furnished by others, as specified and/ordetailed. Provide access to valves and specialties for maintenance. Make connections to

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    equipment, fixtures and systems installed by others where same requires piping servicesindicated in this section.

    J. Install water pipe using proper pipe and fittings. Use reducing fittings for changes in pipe size.

    K. Threaded Pipe Joints:

    1. Make threaded pipe joints with square cut and reamed pipe. Provide tapered pipe threadsin conformance with ANSI B2.1.

    2. Cut threads so that exposed threads at joint are less than three. Coat exposed threadswith asphaltum or other corrosion inhibiting substance. Use joint compounds or Teflontape on pipe threads to achieve leak free joint.

    L. Soldered Copper Pipe Joints:

    1. Use non-acidic and lead free flux on cleaned pipe and fittings for soldered joints.

    2. Cut pipe square and ream thoroughly before assembly.

    3. Fill joints with solder by capillary action. Solder shall cover joint periphery. Wipe jointclean.

    4. Apply heat carefully to prevent damage to pipe, fittings and valves.

    5. Follow manufacturer's recommendations when heating valves and equipment for solderedconnections.

    M. Brazed Copper Pipe Joints:

    1. Cut pipe square and ream thoroughly before assembly.

    2. Joints shall be cleaned and polished before brazing.

    3. Flux of any type shall not be used.

    4. Apply heat carefully to prevent damage to pipe, fittings and valves. Disassemble valveswhere possible to prevent damage to seats during brazing.

    N. Mechanically Formed Tee Fittings:

    1. Form mechanically extracted collars in continuous operation consisting of drilling pilot holeand drawing out tube surface to form collar, having height of not less than 3 times

    thickness of tube wall. Use adjustable collaring device. Notch and dimple branch tube.2. To form couplings, anneal end of tubing to be expanded - insert expander and reform tube

    to accept size OD. Socket expansion shall be at least 3 times base tube wall thickness indepth.

    3. Braze joints and couplings in accordance with American Welding Society "lap-joint" weld,and Copper Development Association copper tube handbook using BCup filler metal.(Note: Soft soldered joints will not be permitted.)

    0.17 WATER HAMMER ARRESTORS

    A. Use water hammer arrestors to control water hammer. Installed devices shall be sized andlocated according to manufacturer's recommendations or as shown on drawings.

    B. Use water hammer arrestors with flush valves, quick-closing valves, at top of risers and atbranch main risers serving more than 1 fixture.

    C. Provide access panels when water hammer arrestors are installed in non-accessible concealedlocations.

    0.18 DIELECTRIC UNIONS AND FLANGES

    A. Install dielectric unions or flanges at points where copper-to-steel pipe connection is required indomestic water systems.

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    B. Install unions on equipment side of shutoff valves for items such as: water heaters, watersofteners, pumps, filters, and similar equipment requiring periodic replacement.

    0.19 EXPANSION JOINTS

    A. Install one anchor on either side of expansion joint, opposite direction of expansion.

    B. Install pipe guides on each side of mechanical expansion fittings.

    0.20 VALVE ACTUATORS

    A. Install chain operators on gate and butterfly valves (2-1/2" and larger).

    B. Provide electric valve actuator and related accessories, compatible with valve specified.Coordinate valve actuation requirements and connection of actuation source to valve withDivision 16 Contractor or Temperature Control Contractor.

    0.21 CLEANING

    A. Flush and clean piping prior to testing. Remove corrosion by mechanical or chemical means.Use chemicals that are non-toxic.

    0.22 TESTING

    A. Refer to Testing paragraph of Section 15000 - General Mechanical Requirements.

    B. Water test system may be applied to system in its entirety or in sections. Test piping withwater to pressure of 100psi for 2 hrs. No decrease in pressure allowed. Provide pressuregauge with shutoff and bleeder valve at highest point of system tested. Inspect joints insystem under test.

    C. Defective work or material shall be replaced or repaired as necessary and inspection and testrepeated. Repairs shall be made with new materials. No caulking of threaded joints or holeswill be allowed.

    D. Do not conceal pipe until satisfactorily tested.

    E. Testing with air will not be allowed.

    0.23 BALANCING

    A. Balance water distribution system. Adjust control valves for proper operation. Set balancingvalves to maintain hot water in hot water system in accordance with settings as indicated ondrawings.

    B. Balance flush valves, flow control valves and mixing valves for adequate flow and temperatureto plumbing fixtures and equipment.

    0.24 DISINFECTION

    A. Disinfect water piping in the following manner:

    1. Clean and flush water pipe with water until water at remote tap is clear.

    2. Fill water systems with solution containing 50 ppm of chlorine (minimum concentration).Allow solution to stay in water system for 24 hours. Alternately use solution of 200 ppm ofchlorine (minimum concentration) for 3 hours.

    3. Flush water system of chlorine solution.

    4. Allow clean water to stand in system for 24 hours. Take sample from remote tap forbacteriological test.

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    B. Do not use water system for potable water supply until safe bacteriological test is obtained.Repeat steps 1 through 4 until safe water system is obtained.

    0.25 BACTERIOLOGICAL TESTS

    A. Take representative water samples and test to ensure bacteriologically safe water supplysystem. Include HPC (Heterotrophic [Standard] Plate Count) test and test for presence of

    Pseudomonas aeruginosa as well as regular coliform bacteria test. HPC test maximumcontainment level of 500 organisms/ml. Perform bacteriological tests shortly before Owner'sacceptance of building. If tests fail, make corrections and retest.

    B. When connecting to existing water supply of unknown quality, sample for analysis andcomparison with finished water system analysis shall be taken prior to making new connection.This will allow isolating source of contamination from within scope of work or pre-existing watersupply. Final conditions shall meet criteria specified above for areas within scope of work.

    END OF SECTION 15120

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