SECTION 15420 DOMESTIC WATER PIPING
PART 1 - GENERAL
1.1 SUMMARY
A. This Section includes domestic water piping from locations indicated to fixtures and equipment inside the building.
1. This applies to the following piping systems which are 2.5” diameter or less shown on the plumbing drawings.
a. W1 – Potable Water
b. HW – Hot Potable Water
c. TW – Tempered Water
B. Related Sections include the following:
1. Division 15 Section "Plumbing Specialties" for water distribution piping special- ties.
1.2 PERFORMANCE REQUIREMENTS
A. Provide components and installation capable of producing domestic water piping sys- tems with the following minimum working-pressure ratings, unless otherwise indicat- ed:
1. Domestic Water Service Piping: 160 psig (1100 kPa).
2. Domestic Water Distribution Piping: 125 psig (860 kPa).
1.3 QUALITY ASSURANCE
A. Piping materials shall bear label, stamp, or other markings of specified testing agency.
B. Comply with NSF 61, "Drinking Water System Components-Health Effects; Sections 1 through 9," for potable domestic water piping and components.
PART 2 - PRODUCTS
2.1 PIPING MATERIALS
A. Refer to Part 3 "Piping Applications" Article for applications of pipe, tube, fitting, and joining materials.
B. Transition Couplings for Aboveground Pressure Piping: Coupling or other manufac- tured fitting the same size as, with pressure rating at least equal to and ends compatible with, piping to be joined.
C. Transition Couplings for Underground Pressure Piping: AWWA C219, metal, sleeve- type coupling or other manufactured fitting the same size as, with pressure rating at least equal to and ends compatible with, piping to be joined.
2.2 COPPER TUBING
A. Soft Copper Tube: ASTM B 88, Type K (ASTM B 88M, Type A), water tube, an- nealed temper.
1. Copper Pressure Fittings: ASME B16.18, cast-copper-alloy or ASME B16.22, wrought-copper, solder-joint fittings. Furnish wrought-copper fittings if indicat- ed.
2. Bronze Flanges: ASME B16.24, Class 150, with solder-joint end. Furnish Class 300 flanges if required to match piping.
3. Copper Unions: MSS SP-123, cast-copper-alloy, hexagonal-stock body, with ball-and-socket, metal-to-metal seating surfaces and solder-joint or threaded ends.
B. Hard Copper Tube: ASTM B 88, Type L (ASTM B 88M, Type B), water tube, drawn temper.
1. Copper Pressure Fittings: ASME B16.18, cast-copper-alloy or ASME B16.22, wrought- copper, solder-joint fittings. Furnish wrought-copper fittings if indicat- ed.
2. Bronze Flanges: ASME B16.24, Class 150, with solder-joint end. Furnish Class 300 flanges if required to match piping.
3. Copper Unions: MSS SP-123, cast-copper-alloy, hexagonal-stock body, with ball-and-socket, metal-to-metal seating surfaces and solder-joint or threaded ends.
4. Copper, Grooved-End Fittings: ASTM B 75 (ASTM B 75M) copper tube or ASTM B 584 bronze castings.
a. Copper-Tubing, Keyed Couplings: Copper-tube dimensions and design similar to AWWA C606. Include ferrous housing sections, gasket suitable for hot water, and bolts and nuts.
2.3 CPVC PIPING
A. CPVC Schedule 80 Pipe: ASTM F 441/F 441M, NSF listed for potable water use.
1. CPVC Schedule 80 Fittings: ASTM F 439, socket type, NSF listed for potable water use.
a. Metal-to-Plastic Transitions: Schedule 80 CPVC with molded-in-place ANSI B1.20.1 threaded metal insert and internal O-ring seal, NSF listed for potable water use.
2.4 PE ENCASEMENT
A. PE Encasement for Underground Metal Piping: ASTM A 674 or AWWA C105 PE film, 0.008-inch (0.20-mm) minimum thickness, tube or sheet.
2.5 VALVES
A. Refer to Division 15 Section "Valves" for bronze, and CPVC, general-duty valves.
B. Refer to Division 15 Section "Plumbing Specialties" for balancing and drain valves.
PART 3 - EXECUTION
3.1 EXCAVATION
A. Refer to Division 2 Section "Earthwork" for excavating, trenching, and backfilling.
3.2 PIPING APPLICATIONS
A. Transition and special fittings with pressure ratings at least equal to piping rating may be used in applications below, unless otherwise indicated.
B. Underground Domestic Water Service Piping: Use the following piping materials for each size range:
1. NPS 2 (DN 50) and Smaller: Soft copper tube, Type K (Type A); copper pres- sure fittings; and soldered joints.
C. Aboveground Domestic Water Piping: Use any of the following piping materials for each size range:
1. NPS 2.5 (DN 50) and Smaller: Hard copper tube, Type L (Type B); copper pres- sure fittings; and soldered joints.
2. For areas which required corrosive resistant construction and/or tempered water, utilize Schedule 80 CPVC pipe. Make transition from Copper to CPVC before pipe route enters area.
3.3 VALVE APPLICATIONS
A. Drawings indicate valve types to be used. Where specific valve types are not indicated, the following requirements apply:
1. Shutoff Duty: Use bronze ball or gate valves for piping NPS 2 (DN 50) and smaller. Use cast-iron butterfly or gate valves with flanged ends for piping NPS 2-1/2 (DN 65) and larger.
2. Throttling Duty: Use bronze ball or globe valves for piping NPS 2 (DN 50) and smaller. Use cast-iron butterfly valves with flanged ends for piping NPS 2-1/2 (DN 65) and larger.
3. Drain Duty: Hose-end drain valves.
3.4 PIPING INSTALLATION
A. Refer to Division 15 Section "Basic Plumbing Materials and Methods" for basic piping installation.
B. Extend domestic water service piping to exterior water distribution piping in sizes and locations indicated.
C. Install underground copper tubing according to CDA's "Copper Tube Handbook."
D. Install cast-iron sleeve with water stop and mechanical sleeve seal at each service pipe penetration through foundation wall. Select number of interlocking rubber links re- quired to make installation watertight. Refer to Division 15 Section "Basic Plumbing Mechanical Materials and Methods" for sleeves and mechanical sleeve seals.
E. Install wall penetration system at each service pipe penetration through foundation wall. Make installation watertight. Refer to Division 15 Section "Basic Plumbing Me- chanical Materials and Methods" for wall penetration systems.
F. Install aboveground domestic water piping level and plumb.
G. Fill water piping. Check components to determine that they are not air bound and that piping is full of water.
H. Perform the following steps before operation:
1. Close drain valves, hydrants, and hose bibbs.
2. Open shutoff valves to fully open position.
3. Remove plugs used during testing of piping and plugs used for temporary sealing of piping during installation.
I. Check plumbing equipment and verify proper settings, adjustments, and operation. Do not operate water heaters before filling with water.
3.5 JOINT CONSTRUCTION
A. Refer to Division 15 Section "Basic Mechanical Materials and Methods" for basic pip- ing joint construction.
B. Soldered Joints: Use ASTM B 813, water-flushable, lead-free flux; ASTM B 32, lead- free-alloy solder; and ASTM B 828 procedure, unless otherwise indicated.
3.6 VALVE INSTALLATION
A. Install sectional valve close to water main on each branch and riser serving plumbing fixtures or equipment. Use ball or gate valves for piping NPS 2 (DN 50) and smaller. Use butterfly or gate valves for piping NPS 2-1/2 (DN 65) and larger.
B. Install shutoff valve on each water supply to equipment and on each water supply to plumbing fixtures without supply stops. Use ball or gate valves for piping NPS 2 (DN 50) and smaller. Use butterfly or gate valves for piping NPS 2-1/2 (DN 65) and larger.
C. Install drain valves for equipment, at base of each water riser, at low points in horizon- tal piping, and where required to drain water piping.
1. Install hose-end drain valves at low points in water mains, risers, and branches.
2. Install stop-and-waste drain valves where indicated.
3.7 HANGER AND SUPPORT INSTALLATION
A. Refer to Division 15 Section "Plumbing Hangers and Supports" for pipe hanger and support devices. Install the following:
1. Vertical Piping: MSS Type 8 or Type 42, clamps.
2. Individual, Straight, Horizontal Piping Runs: According to the following:
a. 100 Feet (30 m) and Less: MSS Type 1, adjustable, steel clevis hangers.
3. Multiple, Straight, Horizontal Piping Runs 100 Feet (30 m) or Longer: MSS Type 44, pipe rolls. Support pipe rolls on trapeze.
B. Install supports according to Division 15 Section "Hangers and Supports."
C. Support vertical piping and tubing at base and at each floor.
D. Rod diameter may be reduced 1 size for double-rod hangers, to a minimum of 3/8 inch (10 mm).
E. Install hangers for copper tubing with the following maximum horizontal spacing and minimum rod diameters:
1. NPS 3/4 (DN 20) and Smaller: 60 inches (1500 mm) with 3/8-inch (10-mm) rod.
2. NPS 1 and NPS 1-1/4 (DN 25 and DN 32): 72 inches (1800 mm) with 3/8-inch (10-mm) rod.
3. NPS 1-1/2 and NPS 2 (DN 40 and DN 50): 96 inches (2400 mm) with 3/8-inch (10-mm) rod.
4. NPS 2-1/2 (DN 65): 108 inches (2700 mm) with 1/2-inch (13-mm) rod.
5. NPS 3 to NPS 5 (DN 80 to DN 125): 10 feet (3 m) with 1/2-inch (13-mm) rod.
F. Install supports for vertical copper tubing every 10 feet (3 m). Reduce spacing for CPVC piping as necessary.
G. Support piping and tubing not listed above according to MSS SP-69 and manufacturer's written instructions.
3.8 CONNECTIONS
A. Drawings indicate general arrangement of piping, fittings, and specialties.
B. Install piping adjacent to equipment and machines to allow service and maintenance.
C. Connect domestic water piping to exterior water service piping. Use transition fitting to join dissimilar piping materials.
D. Connect domestic water piping to service piping with shutoff valve, and extend and connect to the following:
1. Water Heaters: Cold-water supply and hot-water outlet piping in sizes indicated, but not smaller than sizes of water heater connections.
2. Plumbing Fixtures: Cold- and hot-water supply piping in sizes indicated, but not smaller than required by plumbing code. Refer to Division 15 Section "Plumbing Fixtures."
3. Equipment: Cold- and hot-water supply piping as indicated, but not smaller than equipment connections. Provide shutoff valve and union for each connection. Use flanges instead of unions for NPS 2-1/2 (DN 65) and larger.
3.9 FIELD QUALITY CONTROL
A. Inspect domestic water piping as follows:
1. Do not enclose, cover, or put piping into operation until it is inspected and ap- proved by authorities having jurisdiction.
2. During installation, notify authorities having jurisdiction at least 24 hours before inspection must be made. Perform tests specified below in presence of authori- ties having jurisdiction:
a. Roughing-in Inspection: Arrange for inspection of piping before conceal- ing or closing-in after roughing-in and before setting fixtures.
b. Final Inspection: Arrange for final inspection by authorities having juris- diction to observe tests specified below and to ensure compliance with re- quirements.
3. Reinspection: If authorities having jurisdiction find that piping will not pass test or inspection, make required corrections and arrange for reinspection.
4. Reports: Prepare inspection reports and have them signed by authorities having jurisdiction.
B. Test domestic water piping as follows:
1. Test for leaks and defects in new piping and parts of existing piping that have been altered, extended, or repaired. If testing is performed in segments, submit separate report for each test, complete with diagram of portion of piping tested.
2. Leave uncovered and unconcealed new, altered, extended, or replaced domestic water piping until it has been tested and approved. Expose work that was cov- ered or concealed before it was tested.
3. Cap and subject piping to static water pressure of 50 psig (345 kPa) above oper- ating pressure, without exceeding pressure rating of piping system materials. Isolate test source and allow to stand for four hours. Leaks and loss in test pres- sure constitute defects that must be repaired.
4. Repair leaks and defects with new materials and retest piping or portion thereof until satisfactory results are obtained.
5. Prepare reports for tests and required corrective action.
3.10 CLEANING
A. Clean and disinfect potable domestic water piping as follows:
1. Purge new piping and parts of existing domestic water piping that have been al- tered, extended, or repaired before using.
2. Use purging and disinfecting procedures prescribed by authorities having juris- diction or, if methods are not prescribed, procedures described in either AWWA C651 or AWWA C652 or as described below:
a. Flush piping system with clean, potable water until dirty water does not appear at outlets.
b. Fill and isolate system according to either of the following:
1) Fill system or part thereof with water/chlorine solution with at least 50 ppm (50 mg/L) of chlorine. Isolate with valves and allow to stand for 24 hours.
2) Fill system or part thereof with water/chlorine solution with at least 200 ppm (200 mg/L) of chlorine. Isolate and allow to stand for three hours.
c. Flush system with clean, potable water until no chlorine is in water coming from system after the standing time.
d. Submit water samples in sterile bottles to authorities having jurisdiction. Repeat procedures if biological examination shows contamination.
B. Prepare and submit reports of purging and disinfecting activities.
C. Clean interior of domestic water piping system. Remove dirt and debris as work pro- gresses.
END OF SECTION
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