RMF Engineering

Transcription

1 PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: 1. Brass ball valves. 2. Iron gate valves. 3. Bronze globe valves. B. Related Sections: 1. Division 23 HVAC piping Sections for specialty valves applicable to those Sections only. 2. Division 23 Section "Identification for HVAC Piping and Equipment" for valve tags and schedules. 1.3 DEFINITIONS A. CWP: Cold working pressure. B. EPDM: Ethylene propylene copolymer rubber. C. NBR: Acrylonitrile-butadiene, Buna-N, or nitrile rubber. D. NRS: Nonrising stem. E. OS&Y: Outside screw and yoke. F. RS: Rising stem. G. SWP: Steam working pressure. 1.4 SUBMITTALS A. General: Submit the following in accordance with conditions of Contract and Division 1 Specification Sections. B. Product Data: For each type of valve indicated. C. Shop Drawings: Submit manufacturer s assembly-type (exploded view) shop drawings for each type of valve, indicating dimensions, weights, materials, and methods of assembly of components

2 D. Maintenance Data; Submit maintenance data and spare parts lists for each type of valve. Include this data, product data, and shop drawings in Maintenance Manual; in accordance with requirements of Division QUALITY ASSURANCE A. Source Limitations for Valves: Obtain each type of valve from single source from single manufacturer. B. ASME Compliance: 1. ASME B16.10 and ASME B16.34 for ferrous valve dimensions and design criteria. 2. ASME B31.1 for power piping valves. 3. ASME B31.9 for building services piping valves. C. Manufacturers Standardization Society of the Valve and Fittings Industry (MSS) Compliance: Comply with the various MSS Standard Practices referenced. D. ANSI Compliance: For face-to-face and end-to-end dimensions of flanged or welded-end valve bodies, comply with ANSI B16.10 Face-to-Face and End-to-End Dimensions of Ferrous Valves. 1.6 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 gate and globe valves closed to prevent rattling. 4. Set ball valves open to minimize exposure of functional surfaces. 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. PART 2 - PRODUCTS 2.1 GENERAL REQUIREMENTS FOR VALVES A. Refer to HVAC valve schedule articles for applications of valves. B. Valve Pressure and Temperature Ratings: Not less than indicated and as required for system pressures and temperatures. C. Valve Sizes: Same as upstream piping unless otherwise indicated. D. Valve Actuator Types: 1. Handwheel: For valves other than quarter-turn types

3 2. Handlever: For quarter-turn valves NPS 6 and smaller. E. Valves in Insulated Piping: With 2 inch stem extensions and the following features: 1. Gate Valves: With rising stem. 2. Ball Valves: With extended operating handle of non-thermal-conductive material, and protective sleeve that allows operation of valve without breaking the vapor seal or disturbing insulation. F. Valve-End Connections: 1. Solder Joint: With sockets according to ASME B Threaded: With threads according to ASME B G. Valve Bypass and Drain Connections: MSS SP-45. H. Flanges: Comply with ASTM A-216 for steel and ANSI B16.24 for bronze valves. I. Provide valves with features indicated and, where not otherwise indicated, provide proper valve features as determined by Installer for installation requirements. Comply with ASME B31.1 for Power Piping. J. Valve Design: Select and install valves with outside screw and yoke stems, except provide inside screw non-rising stem valves where headroom prevents full opening of OS&Y valves. K. Non-Metallic Disc: Limit selection and installation of valves with non-metallic discs to locations indicated and where foreign materials in piping system can be expected to prevent tight shutoff of metal seated valves. L. Renewable Seats: Select and install valves with renewable seats, except where otherwise indicated. M. Fluid Control: Except as otherwise indicated, install ball valves to comply with ANSI B31.9. Where throttling is indicated or recognized as principal reason for valve, install globe valves. 2.2 BRASS BALL VALVES A. Two-Piece, Full-Port, Brass Ball Valves with Stainless-Steel Trim: b. Crane Co.; Crane Valve Group; Jenkins Valves. c. Flow-Tek, Inc.; a subsidiary of Bray International, Inc. d. Hammond Valve. e. Jamesbury; a subsidiary of Metso Automation. f. Kitz Corporation. g. Marwin Valve; a division of Richards Industries. h. Milwaukee Valve Company. i. RuB Inc

4 2.3 IRON GATE VALVES a. Standard: MSS SP-110. b. SWP Rating: 150 psig. c. CWP Rating: 600 psig. d. Body Design: Two piece. e. Body Material: Forged brass. f. Ends: Threaded. g. Seats: PTFE or TFE. h. Stem: Stainless steel. i. Ball: Stainless steel, vented. j. Port: Full. A. Class 125, NRS, Iron Gate Valves: b. Crane Co.; Crane Valve Group; Jenkins Valves. c. Crane Co.; Crane Valve Group; Stockham Division. d. Flo Fab Inc. e. Hammond Valve. f. Kitz Corporation. g. Legend Valve. h. Milwaukee Valve Company. i. NIBCO INC. j. Powell Valves. k. Red-White Valve Corporation. l. Watts Regulator Co.; a division of Watts Water Technologies, Inc. m. Zy-Tech Global Industries, Inc. a. Standard: MSS SP-70, Type I. b. NPS 2-1/2 to NPS 12, CWP Rating: 200 psig. c. Body Material: ASTM A 126, gray iron with bolted bonnet. d. Ends: Flanged. e. Trim: Bronze. f. Disc: Solid wedge. g. Packing and Gasket: Asbestos free. B. Class 125, OS&Y, Iron Gate Valves: b. Crane Co.; Crane Valve Group; Jenkins Valves. c. Crane Co.; Crane Valve Group; Stockham Division. d. Flo Fab Inc. e. Hammond Valve. f. Kitz Corporation

5 g. Legend Valve. h. Milwaukee Valve Company. i. NIBCO INC. j. Powell Valves. k. Red-White Valve Corporation. l. Watts Regulator Co.; a division of Watts Water Technologies, Inc. m. Zy-Tech Global Industries, Inc. a. Standard: MSS SP-70, Type I. b. NPS 2-1/2 to NPS 12, CWP Rating: 200 psig. c. Body Material: ASTM A 126, gray iron with bolted bonnet. d. Ends: Flanged. e. Trim: Bronze. f. Disc: Solid wedge. g. Packing and Gasket: Asbestos free. 2.4 BRONZE GLOBE VALVES A. Class 125, Bronze Globe Valves with Nonmetallic Disc: b. Crane Co.; Crane Valve Group; Stockham Division. c. NIBCO INC. d. Red-White Valve Corporation. a. Standard: MSS SP-80, Type 2. b. CWP Rating: 200 psig. c. Body Material: ASTM B 62, bronze with integral seat and screw-in bonnet. d. Ends: Threaded or solder joint. e. Stem: Bronze. f. Disc: PTFE or TFE. g. Packing: Asbestos free. h. Handwheel: Malleable iron, bronze, or aluminum. PART 3 - EXECUTION 3.1 EXAMINATION A. 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. B. Operate valves in positions from fully open to fully closed. Examine guides and seats made accessible by such operations. C. Examine threads on valve and mating pipe for form and cleanliness

6 D. Do not attempt to repair defective valves; replace with new valves. 3.2 VALVE INSTALLATION A. General Application: Use gate, ball, and butterfly valves for shut-off duty; globe, ball, and butterfly for throttling duty as indicated in the contract documents. Refer to piping system specification sections for specific valve applications and arrangements. B. Insulation: Where insulation is indicated for the service, provide valves with extended stems, arranged in manner to receive insulation. Handles shall operate over full range without damaging insulation or vapor barrier seals. C. Install valves and unions for each fixture and item of equipment arranged to allow equipment removal without system shutdown. Unions are not required on flanged devices. D. Install by-pass and drain valves per MSS SP-45 or as indicated on the Contract Drawings. E. Locate valves for easy access and provide separate support where necessary. F. Install valves in horizontal piping with stem at or above center of pipe. G. Install valves in position to allow full stem movement. 3.3 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. 3.4 GENERAL REQUIREMENTS FOR VALVE APPLICATIONS A. If valve applications are not indicated, use 1. Shutoff Service (Steam or Hydronic): Ball or gate valves. 2. Throttling Service (except Steam): Ball valves. 3. Throttling Service (Steam): Globe valves. B. If valves with specified SWP classes or CWP ratings are not available, the same types of valves with higher SWP classes or CWP ratings may be substituted. C. Select valves, except wafer types, with the following end connections: 1. For Copper Tubing, NPS 2 and Smaller: Threaded ends except where solder-joint valve-end option is indicated in valve schedules below. 3.5 HEATING-WATER VALVE SCHEDULE A. Pipe NPS 8 and Smaller: 1. Bronze Valves: May be provided with solder-joint ends instead of threaded ends. 2. Ball Valves: Two piece, full port, brass with stainless-steel trim

7 3.6 SOCKET WELD CONNECTIONS A. Make all socket weld connections in accordance with ASME Power Piping Code B THREADED CONNECTIONS A. 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. B. Align threads at point of assembly. C. Apply appropriate tape or thread compound to the external pipe threads (except where dry seal threading is specified). D. Assemble joint, wrench tight. Wrench on valve shall e on the valve end into which the pipe is being threaded. 3.8 FLANGED CONNECTIONS A. Align flange surfaces parallel. B. Assemble joints by sequencing bolt tightening to make initial contact of flanges and gaskets as flat and parallel as possible. Use suitable lubricants on bolt threads. Tighten bolts gradually and uniformly with a torque wrench. C. For dead-end service, butterfly valves require flanges both upstream and downstream for proper shutoff and retention. 3.9 FIELD QUALITY CONTROL A. Tests: After piping systems have been tested and put into service, but before final adjusting and balancing, inspect valves for leaks. Adjust or replace packing to stop leaks; replace valves if leak persists ADJUSTING AND CLEANING A. Valve Adjustment: After piping systems have been tested and put into service, but before final testing, adjusting, and balancing, inspect each valve for possible leaks. Adjust or replace packing to stop leaks, replace valve if leak persists. B. Valve Identification: Tag each valve with non-corrosive tag and Owner approved numbering scheme. C. Cleaning: Clean mill scale, grease, and protective coatings from exterior of valves and prepare valves to receive finish painting or insulation. END OF SECTION