DOMESTIC WATER PIPING

Transcription

1 SECTION - PART 1 - GENERAL 1.01 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section SUMMARY A. Section Includes: 1. Under-building slab and aboveground domestic water pipes, tubes, fittings, and specialties inside the building. B. Related Section: 1. Division 22 Section "Facility Water Distribution Piping" for water-service piping outside the building from source to the point where water-service piping enters the building SUBMITTALS A. Product Data: For the following products: 1. Backflow preventers and vacuum breakers. B. LEED Submittal: 1. Product Data for Credit EQ 4.1: For solvent cements and adhesive primers, including printed statement of VOC content QUALITY ASSURANCE A. Piping materials shall bear label, stamp, or other markings of specified testing agency. B. Comply with NSF 14 for plastic, potable domestic water piping and components. Include marking "NSF-pw" on piping. C. NSF-61-G Compliance: Products in contact with domestic water for human consumption shall meet NSF-61-G and contain less than 0.25% (weighted average) of lead. All products shall be labeled with the Certification Mark NSF- 61-G PROJECT CONDITIONS A. Interruption of Existing Water Service: Do not interrupt water service to facilities occupied by Owner or others unless permitted under the following conditions and then only after arranging to provide temporary water service according to requirements indicated: 1. Notify Architect, Construction Manager and Owner no fewer than two days in advance of proposed interruption of water service. 2. Do not proceed with interruption of water service without Architect's, Construction Manager's and Owner's written permission. HB #I KOLTER HOSPITALITY - 1

2 1.06 COORDINATION A. Coordinate sizes and locations of concrete bases with actual equipment provided. PART 2 - PRODUCTS 2.01 PIPING MATERIALS A. Comply with requirements in "Piping Schedule" Article for applications of pipe, tube, fitting materials, and joining methods for specific services, service locations, and pipe sizes COPPER TUBE AND FITTINGS A. Hard Copper Tube: ASTM B 88, Type L water tube, drawn temper. 1. Bronze Flanges: ASME B16.24, Class 150, with solder-joint ends. 2. 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. 3. Copper Pressure-Seal-Joint Fittings: 4. Hard copper tube, ASTM B 88, Type L Copper Solder-Joint Fittings: wrought-copper fittings. a. Manufacturers: Subject to compliance with requirements, provide products by one of the following: 1) NIBCO INC. 2) Viega; Plumbing and Heating Systems. b. NPS 2 and Smaller: Wrought-copper fitting with EPDM-rubber O-ring seal in each end. c. NPS 2-1/2 to NPS 4: Cast-bronze or wrought-copper fitting with EPDM-rubber O-ring seal in each end. 5. Grooved-Joint Copper-Tube Appurtenances: a. Manufacturers: Subject to compliance with requirements, provide products by one of the following: 1) Anvil International. 2) Shurjoint Piping Products. 3) Victaulic Company. b. Grooved-End-Tube Couplings: Copper-tube dimensions and design similar to AWWA C606. Include ferrous housing sections, EPDMrubber gaskets suitable for hot and cold water, and bolts and nuts. B. Soft Copper Tube: ASTM B 88, Type K water tube, annealed temper. 1. Copper Solder-Joint Fittings: ASME B16.22, wrought-copper pressure fittings DUCTILE-IRON PIPE AND FITTINGS A. Mechanical-Joint, Ductile-Iron Pipe: AWWA C151, with mechanical-joint bell and plain spigot end unless grooved or flanged ends are indicated. HB #I KOLTER HOSPITALITY - 2

3 1. Standard-Pattern, Mechanical-Joint Fittings: AWWA C110, ductile or gray iron. B. Push-on-Joint, Ductile-Iron Pipe: AWWA C151, with push-on-joint bell and plain spigot end unless grooved or flanged ends are indicated. 1. Standard-Pattern, Push-on-Joint Fittings: AWWA C110, ductile or gray iron. a. Gaskets: AWWA C111, rubber CPVC COPPEER TUBE SIZE (CTS) PIPE AND FITTINGS A. CPVC Piping System: ASTM D 2846/ D 2846M, SDR 11, pipe and socket fittings. B. CPVC Tubing System: ASTM D 2846/ D 2846M, SDR 11, tube and socket fittings. C. CPVC Schedule 80: Not Permitted PEX-a TUBE AND FITTINGS A. PEX-a (Engle-Method Crosslinked Polyethylene) Piping: ASTM F 876/877, SDR 9 tubing. B. Manufacturer: 1. Uponor 2. Substitutions: Not permitted. C. Piping to have minimum material designation of PEX D. Manufactured Joint: 3/8 inch through 3 inch nominal pipe size: 1. ASTM F1960 cold-expansion fitting for PEX-a Tube manufactured from the following material types: a. UNS No. C69300 Lead-free (LF) Brass b. 20% glass-filled polysulfone as specified in ASTM D6394 c. Unreinforced polysulfone (group 01, class 1, grade 2) as specified in ASTM D6394 d. Polyphenylsulfone (group 03, class 1, grade 2) as specified in ASTM D6394 e. Blend of polyphenylsulfone (55-80%) and unreinforced polysulfone (rem.) as specified in ASTM D Reinforcing cold-expansion rings shall be manufactured from the same source as PEX-a piping and marked F1960. E. Mechanical Joint: 1/4 inch through 3 inch nominal pipe size: 1. SDR9 compression-type fitting consisting of a nut, compression ring and insert. 2. Compression fitting shall comply with ASTM F877, NSF 14 and NSF 61. F. Mechanical Joint: 1 inch through 3 inch nominal pipe size: 1. SDR9 compression-type fitting consisting of a double o-ring insert with a compression sleeve tightened around the pipe and insert. 2. Compression fitting shall comply with ASTM F877, NSF 14 and NSF 61. HB #I KOLTER HOSPITALITY - 3

4 G. Manifold: Engineered Plastic (EP) body with ProPEX outlet connections as manufactured by Uponor PEX-b TUBE AND FITTINGS A. Manufacturers: 1. Viega PEX Water System: ViegaPEX Ultra, ViegaPEX Barrier, and FostaPEX manufactured by Viega LLC, 100 N. Broadway, Suite 600, Wichita, KS 67202, B. Material: 1. Tubing Standard: ViegaPEX Ultra High-Density Cross-linked polyethylene tubing shall be manufactured to the requirements of ASTM F876 and meet the standard grade hydrostatic pressure ratings from Plastic Pipe Institute in accordance with TR-4/03. The following three standard grade ratings are required. a. 200 F at 80 psig b. 180 F at 100 psig c F at 160 psig 2. Chlorine testing: According to ASTM F876 shall meet or exceed the following end use condition. a. End use conditions of : 140 F 1) Per PEX 5306 (CL5) 2) UV testing: According to ASTM F876 PEX tubing products shall meet or exceed the following exposure limits. a) ViegaPEX Ultra 6 months 3. Fitting Standard: PEX Press fittings shall be manufactured from UNS, C87700, C87710 Bronze or Radel R polymer, meeting the requirements of ASTM F877 tested as a system with Viega PEX tubing. The PEX Press sleeve shall be manufactured out of a 304 grade or better stainless steel and have three view holes (attached sleeve) to ensure proper PEX tubing insertion. The attached sleeve fitting will incorporate a tool locator ring that shall be in place while making a proper press connection. The PEX Press connection shall be made with a Viega supplied ratcheting PEX Press hand tool or PEX Press power tool. 4. Fitting Standard: PEX Crimp fittings for use with copper crimp rings shall be manufactured from UNS C69300 or C87850 Brass / Eco Brass meeting the requirements of ASTM F1807 and or PolyAlloy polymer meeting the requirements of ASTM F2159. The PEX Crimp connection shall be made by use of a full circle crimp tool designed to crimp F1807 copper crimp rings. 5. Manifolds: Acceptable manifolds shall include: a. Copper Manifolds: Shall be copper material having a male or female solder, ProPress or PEX Crimp inlets. All outlets shall be PEX Press, PEX Crimp or ProPress fittings. Shall be provided by the Crosslinked Polyethylene system manufacturer. HB #I KOLTER HOSPITALITY - 4

5 b. Polymer Manifolds: Shall be plastic material having a male NPSM thread, PEX Press or PEX Crimp inlets. All outlets shall be PEX Press, PEX Crimp, or PEX compression connections provided by the PEX system manufacturer. 6. Adapter Fittings: PEX adapter fittings shall conform to one of the following ASTM standards; F877, F1807, F2159, or ASME B and be listed to the CSA B The adapter fittings shall mate to NPT threads, copper tubing, copper fittings or ProPress fittings PIPING JOINING MATERIALS A. Pipe-Flange Gasket Materials: AWWA C110, rubber, flat face, 1/8 inch thick or ASME B16.21, nonmetallic and asbestos free, unless otherwise indicated; fullface or ring type unless otherwise indicated. B. Metal, Pipe-Flange Bolts and Nuts: ASME B18.2.1, carbon steel unless otherwise indicated. C. Solvent Cements for Joining CPVC Piping and Tubing: ASTM F CPVC solvent cement shall have a VOC content of 490 g/l or less when calculated according to 40 CFR 59, Subpart D (EPA Method 24). 2. Adhesive primer shall have a VOC content of 550 g/l or less when calculated according to 40 CFR 59, Subpart D (EPA Method 24). 3. Solvent cement and adhesive primer shall comply with the testing and product requirements of the California Department of Health Services' "Standard Practice for the Testing of Volatile Organic Emissions from Various Sources Using Small-Scale Environmental Chambers." PART 3 - EXECUTION 3.01 EARTHWORK A. Comply with requirements in Division 31 Section "Earth Moving" for excavating, trenching, and backfilling PIPING INSTALLATION A. Drawing plans, schematics, and diagrams indicate general location and arrangement of domestic water piping. Indicated locations and arrangements are used to size pipe and calculate friction loss, expansion, and other design considerations. Install piping as indicated unless deviations to layout are approved on Coordination Drawings. B. Install copper tubing under building slab according to CDA's "Copper Tube Handbook." C. Install ductile-iron piping under building slab with restrained joints according to AWWA C600 and AWWA M41. D. Install underground copper tube in PE encasement according to ASTM A 674 or AWWA C105. E. Install shutoff valve, hose-end drain valve, strainer, pressure gage, and test tee with valve, inside the building at each domestic water service entrance. Comply with requirements in Division 22 Section "Meters and Gages for HB #I KOLTER HOSPITALITY - 5

6 Plumbing Piping" for pressure gages and Division 22 Section "Domestic Water Piping Specialties" for drain valves and strainers. F. Install shutoff valve immediately upstream of each dielectric fitting. G. Install water-pressure-reducing valves downstream from shutoff valves. Comply with requirements in Division 22 Section "Domestic Water Piping Specialties" for pressure-reducing valves. H. Install domestic water piping level without pitch and plumb. I. Rough-in domestic water piping for water-meter installation according to utility company's requirements. J. Install piping concealed from view and protected from physical contact by building occupants unless otherwise indicated and except in equipment rooms and service areas. K. Install piping indicated to be exposed and piping in equipment rooms and service areas at right angles or parallel to building walls. Diagonal runs are prohibited unless specifically indicated otherwise. L. Install piping above accessible ceilings to allow sufficient space for ceiling panel removal, and coordinate with other services occupying that space. M. Install piping adjacent to equipment and specialties to allow service and maintenance. N. Install piping to permit valve servicing. O. Install nipples, unions, special fittings, and valves with pressure ratings the same as or higher than system pressure rating used in applications below unless otherwise indicated. P. Install piping free of sags and bends. Q. Install fittings for changes in direction and branch connections. R. Install unions in copper tubing at final connection to each piece of equipment, machine, and specialty. S. Install pressure gages on suction and discharge piping from each plumbing pump and packaged booster pump. Comply with requirements in Division 22 Section "Meters and Gages for Plumbing Piping" for pressure gages. T. Install thermostats in hot-water circulation piping. Comply with requirements in Division 22 Section "Domestic Water Pumps" for thermostats. U. Install thermometers on outlet piping from each water heater. Comply with requirements in Division 22 Section "Meters and Gages for Plumbing Piping" for thermometers. V. Install PEX tubing that is free of blemishes, cuts, gouges, kinks or noticeable fading of color. W. Changes in Direction: PEX-b tubing shall not exceed an eight times the tubing outside diameter (OD) free bend radius or a five times the tubing OD supported bend radius, with use of a Viega approved bend support. Install fittings for changes in direction where any minimum bend radius is exceeded and branch connections. HB #I KOLTER HOSPITALITY - 6

7 3.03 JOINT CONSTRUCTION A. Ream ends of pipes and tubes and remove burrs. Bevel plain ends of steel pipe. B. Remove scale, slag, dirt, and debris from inside and outside of pipes, tubes, and fittings before assembly. C. Threaded Joints: Thread pipe with tapered pipe threads according to ASME B Cut threads full and clean using sharp dies. Ream threaded pipe ends to remove burrs and restore full ID. Join pipe fittings and valves as follows: 1. Apply appropriate tape or thread compound to external pipe threads. 2. Damaged Threads: Do not use pipe or pipe fittings with threads that are corroded or damaged. D. Pressure-Sealed Joints: Join copper tube and pressure-seal fittings with tools recommended by fitting manufacturer. E. Copper-Tubing Grooved Joints: Roll groove end of tube. Assemble coupling with housing, gasket, lubricant, and bolts. Join copper tube and grooved-end fittings according to AWWA C606 for roll-grooved joints. F. Flanged Joints: Select appropriate asbestos-free, nonmetallic gasket material in size, type, and thickness suitable for domestic water service. Join flanges with gasket and bolts according to ASME B31.9. G. Joint Construction for Solvent-Cemented Plastic Piping: Clean and dry joining surfaces. Join pipe and fittings according to the following: 1. Comply with ASTM F 402 for safe-handling practice of cleaners, primers and solvent cements. Apply primer. 2. CPVC Piping: Join according to ASTM D 2846/D 2846M Appendix. H. Dissimilar-Material Piping Joints: Make joints using adapters compatible with materials of both piping systems. I. PEX-b Press Connections: PEX Press fittings shall be made in accordance with the manufacturer s installation instructions. The Stainless press sleeve shall be placed over the end of the squared off PEX tubing while fully inserting the fitting barb into the tubing. Full tubing insertion shall be verified by a visual confirmation of PEX being present through the view holes before engaging a press connection. Full insertion for an attached sleeve connection means tubing must be completely visible in at least two view holes and partially visible in the final view hole. The PEX Press connection shall be made with a Viega supplied ratcheting PEX Press hand tool or PEX Press power tool. J. PEX-b Crimp Connections: PEX Crimp fittings shall be made in accordance with the manufacturer s installation instructions. The copper crimp ring shall be placed over the end of the squared off PEX tubing then the PEX Crimp fitting fully inserted into the tubing. Position the crimp ring ⅛ to ¼ from the end of the tubing before engaging a crimp connection. The PEX Crimp connection shall be made with a Viega supplied full circle crimp tool or equivalent. HB #I KOLTER HOSPITALITY - 7

8 K. PEX-b Threaded Joints: Threaded joints shall have a potable water listed joint sealant tape applied to the male threads only. Tighten joint with a wrench and backup wrench as required HANGER AND SUPPORT INSTALLATION A. Comply with requirements in Division 22 Section "Hangers and Supports for Plumbing Piping and Equipment" for pipe hanger and support products and installation. 1. Vertical Piping: MSS Type 8 or 42, clamps. 2. Individual, Straight, Horizontal Piping Runs: a. 100 Feet and Less: MSS Type 1, adjustable, steel clevis hangers. b. Longer Than 100 Feet: MSS Type 43, adjustable roller hangers. c. Longer Than 100 Feet If Indicated: MSS Type 49, spring cushion rolls. 3. Multiple, Straight, Horizontal Piping Runs 100 Feet or Longer: MSS Type 44, pipe rolls. Support pipe rolls on trapeze. 4. Base of Vertical Piping: MSS Type 52, spring hangers. B. Support vertical piping and tubing at base and at each floor. C. Rod diameter may be reduced one size for double-rod hangers, to a minimum of 3/8 inch. D. Install hangers for copper tubing with the following maximum horizontal spacing and minimum rod diameters: 1. NPS 3/4 and Smaller: 60 inches with 3/8-inch rod. 2. NPS 1 and NPS 1-1/4: 72 inches with 3/8-inch rod. 3. NPS 1-1/2 and NPS 2: 96 inches with 3/8-inch rod. 4. NPS 2-1/2: 108 inches with 1/2-inch rod. 5. NPS 3 to NPS 5: 10 feet with 1/2-inch rod. 6. NPS 6: 10 feet with 5/8-inch rod. 7. NPS 8: 10 feet with 3/4-inch rod. E. Install supports for vertical copper tubing every 10 feet. F. Install hangers for CPVC piping with the following maximum horizontal spacing and minimum rod diameters. 1. NPS 1 and Smaller: 36 inches with 3/8-inch rod. 2. NPS 1-1/4 to NPS 2: 48 inches with 3/8-inch rod. G. Support piping and tubing not listed in this article according to MSS SP-69 and manufacturer's written instructions. H. Horizontal Support: PEX-b tubing must be supported every 32 horizontally with Viega approved suspension clips or plastic insulators. I. Vertical Support: PEX-b tubing must be supported at each floor or ceiling penetration and every four feet in between. HB #I KOLTER HOSPITALITY - 8

9 3.05 PROTECTION A. PEX-b Tubing Protection: Protect PEX tubing from exposure to direct and indirect sunlight exposure. PEX tubing shall be stored under cover, shielded from direct and indirect sunlight when material is stored for any length of time. B. PEX-b Tubing Penetration Protection: Provide allowance for thermal expansion and contraction of PEX tubing passing through a wall, floor, ceiling or partition by wrapping with pipe insulation, or by installing through an appropriately sized sleeve. Penetrations of fire resistance rated assemblies shall maintain the rating of the assembly 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 water-service piping with shutoff valve; extend and connect to the following: 1. Domestic Water Booster Pumps: Cold-water suction and discharge piping. 2. Water Heaters: Cold-water inlet and hot-water outlet piping in sizes indicated, but not smaller than sizes of water heater connections. 3. Plumbing Fixtures: Cold- and hot-water supply piping in sizes indicated, but not smaller than required by plumbing code. Comply with requirements in Division 22 plumbing fixture Sections for connection sizes. 4. 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 and larger IDENTIFICATION A. Identify system components. Comply with requirements in Division 22 Section "Identification for Plumbing Piping and Equipment" for identification materials and installation. B. Label pressure piping with system operating pressure ADJUSTING A. Perform the following adjustments before operation: 1. Close drain valves, hydrants, and hose bibbs. 2. Open shutoff valves to fully open position. 3. Open throttling valves to proper setting. 4. Adjust balancing valves in hot-water-circulation return piping to provide adequate flow. a. Manually adjust ball-type balancing valves in hot-water-circulation return piping to provide flow of hot water in each branch. HB #I KOLTER HOSPITALITY - 9

10 3.09 TESTING b. Adjust calibrated balancing valves to flows indicated. 5. Remove plugs used during testing of piping and for temporary sealing of piping during installation. 6. Remove and clean strainer screens. Close drain valves and replace drain plugs. 7. Remove filter cartridges from housings and verify that cartridges are as specified for application where used and are clean and ready for use. 8. Check plumbing specialties and verify proper settings, adjustments, and operation. A. Water Testing: The PEX-b tubing system shall be pressure tested in accordance with local code after installation or to at least minimum system working pressure, no less than 40 psi, and for a period of no less than 15 minutes. Water used for this testing shall come from a potable water source. Test should not exceed pressure rating of PEX tubing and shall have no leaks. B. Air Testing: In lieu of a water test, the PEX-b tubing system shall be air tested in accordance with local code after installation, or at least system working pressure, no less than 40 psi and no greater than 100 psi. The test shall be conducted for a period of no less than 15 minutes and no greater than an hour and not leak more than 8 psi over the test duration. Refer to the PEX manufacturers installation instructions for safety considerations while conducting air testing CLEANING A. Clean and disinfect potable and non-potable domestic water piping as follows: 1. Purge new piping and parts of existing piping that have been altered, extended, or repaired before using. 2. Use purging and disinfecting procedures prescribed by authorities having jurisdiction; if methods are not prescribed, use procedures described in either AWWA C651 or AWWA C652 or follow procedures 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 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 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. HB #I KOLTER HOSPITALITY - 10

11 d. Submit water samples in sterile bottles to authorities having jurisdiction. Repeat procedures if biological examination shows contamination. B. Clean non-potable domestic water piping as follows: 1. Purge new piping and parts of existing piping that have been altered, extended, or repaired before using. 2. Use purging procedures prescribed by authorities having jurisdiction or; if methods are not prescribed, follow procedures described below: a. Flush piping system with clean, potable water until dirty water does not appear at outlets. b. Submit water samples in sterile bottles to authorities having jurisdiction. Repeat procedures if biological examination shows contamination. C. Prepare and submit reports of purging and disinfecting activities. D. Clean interior of domestic water piping system. Remove dirt and debris as work progresses. E. Disinfection: The PEX-b hot and cold water distribution system may require system disinfection. When no other method is available, follow the time limitations and exposure levels listed below. 1. Flush the system with potable water until discolored water does not appear at any of the outlets. 2. Fill the system with a water chlorine solution containing at least 50 parts per million of chlorine. The system shall be valved in the closed position and to stand for 24 hours. Alternatively, the system shall be filled with water chlorine solution containing at least 200 parts per million of chlorine. The System shall be valved in the closed position and allowed to stand for 3 hours. 3. Following the standing time, the system shall be flushed with water until the chlorine is purged from the system PIPING SCHEDULE A. Transition and special fittings with pressure ratings at least equal to piping rating may be used in applications below unless otherwise indicated. B. Flanges and unions may be used for aboveground piping joints unless otherwise indicated. C. Fitting Option: Extruded-tee connections and brazed joints may be used on aboveground copper tubing. D. Under-building-slab, domestic water, building-service piping, shall be one of the following: 1. Soft copper tube, ASTM B 88, Type K; wrought-copper solder-joint fittings; and brazed joints. 2. Mechanical-joint, ductile-iron pipe; standard- pattern mechanical-joint fittings; and mechanical joints. HB #I KOLTER HOSPITALITY - 11

12 3. Push-on-joint, ductile-iron pipe; standard- pattern push-on-joint fittings; and gasketed joints. E. Aboveground domestic water piping, sizes 2 inches and smaller, shall be one of the following: 1. Hard copper tube, ASTM B 88, Type L; copper pressure-seal-joint fittings; and pressure-sealed joints. 2. Hard copper tube, ASTM B 88, Type L; grooved-joint copper-tube appurtenances; and grooved joints. 3. Hard copper tube, ASTM B 88, Type L Copper Solder-Joint Fittings: wrought-copper fittings. 4. PEX-a tube, ASTM F876, ASTM F877, Cold Expansion Fittings with PEX-a Reinforcing Rings, ASTM F PEX-b tube, ASTM F876, ASTM F877, Metal Insert Fittings Utilizing A Copper Crimp Ring, ASTM F PEX-b tube, ASTM F876, ASTM F877, Plastic Insert Fittings Utilizing A Copper Crimp Ring, ASTM F CPVC CTS tube for sizes 2 inches and smaller, in guestrooms only. F. Aboveground domestic water piping, sizes 2-1/2 inches and larger, shall be one of the following: 1. Hard copper tube, ASTM B 88, Type L; copper pressure-seal-joint fittings; and pressure-sealed joints. 2. Hard copper tube, ASTM B 88, Type L; grooved-joint copper-tube appurtenances; and grooved joints. 3. Hard copper tube, ASTM B 88, Type L Copper Solder-Joint Fittings: wrought-copper fittings. 4. Stainless steel Schedule 10 pipe, grooved-joint fittings, and grooved joints. 5. Stainless steel Schedule 40 pipe, grooved-joint fittings, and grooved joints VALVE SCHEDULE A. Drawings indicate valve types to be used. Where specific valve types are not indicated, the following requirements apply: 1. Shutoff Duty: Use ball or gate valves for piping NPS 2 inches and smaller. Use butterfly, ball, or gate valves with flanged ends for piping NPS 2-1/2 inches and larger. 2. Throttling Duty: Use ball or globe valves for piping NPS 2 inches and smaller. Use butterfly or ball valves with flanged ends for piping NPS 2-1/2 inches and larger. 3. Hot-Water Circulation Piping, Balancing Duty: Thermostatic balancing valves. 4. Drain Duty: Hose-end drain valves. B. Use check valves to maintain correct direction of domestic water flow to and from equipment. HB #I KOLTER HOSPITALITY - 12

13 C. Iron grooved-end valves may be used with grooved-end piping. END OF SECTION HB #I KOLTER HOSPITALITY - 13

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