Herpteraium SECTION VALVES GENERAL

Transcription

1 SECTION VALVES 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. B. Section Basic Plumbing Requirements, and Section Basic Plumbing Materials and Methods all apply to the work of this Section as if fully repeated herein. 1.1 SUMMARY A. This Section includes the following general-duty valves common to Division 22 plumbing piping systems: 1. Ball valves. 2. Butterfly valves. 3. Check valves. B. Related Sections include the following: 1. Division 02 piping Sections for general-duty and specialty valves for site construction piping. 2. Division 22 Section Basic Plumbing Materials and Methods for valve tags and charts. 3. Division 22 piping Sections for specialty valves applicable to those Sections only. 1.2 DEFINITIONS A. The following are standard abbreviations for valves used in this Section: 1. CWP: Cold working pressure (formerly WOG Water, Oil, Gas working pressure). 2. EPDM: Ethylene-propylene-diene terpolymer rubber. 3. IBBM: Iron body, bronze-mounted. 4. PTFE: Polytetrafluoroethylene plastic. 5. SWP: Steam working pressure. 6. TFE: Tetrafluoroethylene plastic. 7. Class 125: Minimum 125-psig (860-kPa) SWP and minimum 200-psig (1380-kPa) CWP ratings. 8. Class 150: Minimum 150-psig (1035-kPa) SWP and minimum 300-psig (2070-kPa) CWP ratings. 1.3 SUBMITTALS A. Product Data: For each type of valve indicated. Include body, seating, and trim materials; valve design; pressure and temperature classifications; end connections; arrangement; dimensions; and required clearances. Include list indicating valve and its application. Include rated capacities; shipping, installed, and operating weights; furnished specialties; and accessories. VALVES August 9,

2 B. Maintenance Data: For each type of valve, to include in the operation and maintenance manual specified in Division 01. Include detailed manufacturer s instructions on adjusting, servicing, disassembling, and repairing. 1.4 QUALITY ASSURANCE A. ASME Compliance: ASME B31.9 for building services piping valves. B. ASME Compliance for Ferrous Valves: ASME B16.10 and ASME B16.34 for dimension and design criteria. C. NSF Compliance: NSF 61 for valve materials for potable-water service in compliance with Public Law # D. MSS Compliance: Comply with the various MSS Standard Practice documents referenced herein. 1.5 DELIVERY, STORAGE, AND HANDLING A. Prepare valves for shipping as follows: 1. Protect internal parts against rust and corrosion. 2. Protect threads, flange faces, grooves, and weld ends. 3. Set ball valves open to minimize exposure of functional surfaces. 4. Set butterfly valves closed or slightly open. 5. Block check valves in either closed or open position. B. Use the following precautions during storage: 1. Maintain valve end protection. 2. Store valves indoors and maintain at higher than ambient dew-point temperature. If outdoor storage is necessary, store valves off the ground in watertight enclosures. C. Use sling to handle large valves; rig sling to avoid damage to exposed parts. Do not use handwheels or stems as lifting or rigging points. PART 2 - PRODUCTS 2.1 MANUFACTURERS A. General: Subject to compliance with requirements, provide gate valves, globe valves, and swing check valves by one of the following: 1. Crane Co.; Crane Valve Group; Crane, Jenkins, & Stockham brands. 2. Grinnell Corporation. 3. Hammond Valve. 4. Milwaukee Valve Company. 5. NIBCO Inc. 6. Watts Industries, Inc.; Water Products Div. B. Ball Valves: Subject to compliance with requirements, provide ball valves by one of the following: VALVES August 9,

3 1. Any of the manufacturers listed under the General subheading above. 2. Conbraco Industries, Inc.; Apollo Div. 3. Jamesbury, Inc. 4. Watts 5. Nibco C. Standard-Performance Butterfly Valves: Subject to compliance with requirements, provide butterfly valves by one of the following: 1. Any of the manufacturers listed under the General subheading above. 2. Central Sprinkler Co.; Central Grooved Piping Products 3. Crane Co.; Crane Valve Group; Center Line brand. 4. General Signal; DeZurik Unit 5. McWane, Inc.; Kennedy Div. 6. Bray USA 7. Victaulic Co. of America. D. Swing Check Valves: Subject to compliance with requirements, provide butterfly-style dualplate wafer check valves, piston-style lift-disc, and swing check valves by one of the following: Any of the manufacturers listed under the General subheading above. 1. Nibco 2. Watts 3. Kennedy 4. Apollo 2.2 VALVES, COMMON REQUIREMENTS A. General: Refer to Part 3 Valve Applications Schedule Article for application schedule of valves, end connections, and actuator types. B. Valve Sizes: Same as upstream pipe size, unless otherwise indicated. C. Valve Flanges: ASME B16.1 for cast-iron valves, ASME B16.5 for steel valves, and ASME B16.24 for bronze valves. D. Valve Grooved Ends: AWWA C606. E. Valve Threaded Ends: With threads according to ASME B F. Valve Bypass and Drain Connections: MSS SP-45. G. Material Substitution: Ductile iron is acceptable anywhere cast iron is specified, but cast iron is not acceptable where ductile iron is specified. H. Class Substitution: If valves with specified SWP classes or CWP ratings are not available, the same types of valves with higher SWP class or CWP ratings may be substituted. I. For piping systems required to be insulated, valve stems shall be extended to accommodate insulation. Refer to other Division 22 Sections for piping systems required to be insulated. VALVES August 9,

4 J. NSF Compliance: NSF 61 for valve materials for potable-water service in compliance with Public Law # BALL VALVES A. Liquid Service, Size NPS 2-1/2 and smaller: 1. General: Valve shall conform to MSS SP Minimum SWP rating: 150-psig (1035-kPa). 3. Minimum CWP rating: 600-psig (4140-kPa). 4. Body: ASTM B584 bronze, two-piece construction. 5. Ball: Type 316 stainless steel, full port. 6. Stem: Blowout-proof Type 316 stainless steel. 7. Seat/Packing: PTFE or TFE. 8. Ends: Threaded/Soldered. 9. Handle: Vinyl-covered steel lever with memory stop; and zinc-plated steel nut. 2.4 CHECK VALVES A. Bronze Swing Check Valve, NPS 2 (DN50) and smaller: Valve shall conform to MSS SP Minimum pressure rating: Class Body: ASTM B62 bronze body, y-pattern. 3. Bonnet: ASTM B62 bronze, threaded, removable for regrinding. 4. Disc and seat: Renewable; ASTM B62 bronze with bronze-alloy hinge pin. 5. Hardware: Bronze or bronze alloy. 6. Ends: Threaded. PART 3 - EXECUTION 3.1 EXAMINATION A. Examine piping system for compliance with requirements for installation tolerances and other conditions affecting performance. Proceed with installation only after unsatisfactory conditions have been corrected. B. Examine valve interior for cleanliness, freedom from foreign matter, and corrosion. Remove special packing materials, such as blocks, used to prevent disc movement during shipping and handling. C. Operate valves in positions from fully open to fully closed. Examine guides and seats made accessible by such operations. D. Examine threads on valve and mating pipe for form and cleanliness. E. Examine mating flange faces for conditions that might cause leakage. Check bolting for proper size, length, and material. Verify that gasket is of proper size, that its material composition is suitable for service, and that it is free from defects and damage. F. Do not attempt to repair defective valves; replace with new valves. VALVES August 9,

5 3.2 VALVE INSTALLATION A. Install valves as indicated, according to manufacturer s written instructions. B. Piping installation requirements are specified in other Division 22 Sections. Drawings indicate general arrangement of piping, fittings, and specialties. C. Install isolation valves at each piece of equipment arranged to allow service, maintenance, and equipment removal without system shutdown. D. Locate valves for easy access and provide separate support where necessary. E. Install valves in horizontal piping with stem at or above center of pipe. F. Any valve that represents a termination or the end of a run (e.g., blowdown or drain valve, hoseend valve, etc.) shall be fitted with a permanent but removable cap, plug, or blind flange matching the valve construction, to minimize risk in the event the valve is accidentally opened under pressure. G. Install check valves for proper direction of flow and as follows: 1. Swing Check Valves: In horizontal position with hinge pin level, or vertical with upward flow. 3.3 JOINT CONSTRUCTION A. Refer to Division 22 Section Basic Plumbing Materials and Methods for basic piping joint construction. B. Grooved Joints: Assemble joints with keyed coupling housing, gasket, lubricant, and bolts according to coupling and fitting manufacturer s written instructions. C. Threaded Connections: Note the internal length of threads in valve ends and proximity of valve internal seat or wall to determine how far pipe should be threaded into valve. 1. Align threads at point of assembly. 2. Apply appropriate tape or thread compound to the external pipe threads, except where dry seal threading is specified. 3. Assemble joint, wrench tight. Wrench on valve shall be on the valve end into which the pipe is being threaded. 3.4 ADJUSTING A. Adjust or replace valve packing after piping systems have been tested and put into service but before final adjusting and balancing. Replace valves if persistent leaking occurs. 3.5 VALVE APPLICATIONS SCHEDULE A. General: Refer to piping Sections and Drawings for specific valve applications. If no specific valve type is indicated, use the valve types indicated in the following schedules. VALVES August 9,

6 B. Domestic Water Piping: Choices are contractor s option unless a specific type of valve is specifically called out by name on the Drawings. 1. For shutoff duty, NPS 2 (DN 50) and smaller, use ball valves. 2. For throttling duty, NPS 2 (DN 50) and smaller, use ball valves. END OF SECTION VALVES August 9,