AWWA C500-09 供水系统用金属密封闸阀.pdf

ANSI/AWWA C500-09 Revision of ANSI/AWWA C500-02 AWWA Standard Effective date Oct. 1, 2009. First edition approved by AWWA Board of Directors Jan 30, 1984. This edition approved Jan. 25, 2009. Approved by American National Standards Institute Aug. 13, 2009. 6666 West Quincy Avenue Advocacy Denver, CO 80235-3098 Communications T 800.926.7337 Conferences www.awwa.org Education and Training Science and Technology Sections SM The Authoritative Resource on Safe Water Metal-Seated Gate Valves for Water Supply Service c500-09.indd i8/31/2009 114752 AM Copyright 2009 American Water Works Association. All Rights Reserved. ii AWWA Standard This document is an American Water Works Association AWWA standard. It is not a specifi cation. AWWA standards describe minimum requirements and do not contain all of the engineering and administrative ination normally contained in specifi - cations. The AWWA standards usually contain options that must be uated by the user of the standard. Until each optional feature is specifi ed by the user, the product or service is not fully defi ned. AWWA publication of a standard does not constitute endorsement of any product or product type, nor does AWWA test, certify, or approve any product. The use of AWWA standards is entirely voluntary. This standard does not supersede or take precedence over or displace any applicable law, regulation, or codes of any governmental authority. AWWA standards are intended to represent a consensus of the water supply industry that the product described will provide satisfactory service. When AWWA revises or withdraws this standard, an offi cial notice of action will be placed on the fi rst page of the classifi ed advertising section of Journal AWWA. The action becomes effective on the fi rst day of the month following the month of Journal AWWA publication of the offi cial notice. American National Standard An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An Ameri- can National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether that person has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not coning to the standard. American National Standards are subject to periodic review, and users are cautioned to obtain the latest editions. Producers of goods made in conity with an American National Standard are encouraged to state on their own responsibility in advertis- ing and promotional materials or on tags or labels that the goods are produced in conity with particular American National Standards. CAUTION NOTICE The American National Standards Institute ANSI approval date on the front cover of this standard indicates completion of the ANSI approval process. This American National Standard may be revised or withdrawn at any time. ANSI procedures require that action be taken to reaffi rm, revise, or withdraw this standard no later than fi ve years from the date of publication. Purchasers of American National Standards may receive current ination on all standards by calling or writing the American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036; 212 642-4900. All rights reserved. No part of this publication may be reproduced or transmitted in any or by any means, electronic or mechanical, including photocopy, recording, or any ination or retri system, except in the of brief excerpts or quotations for review purposes, without the written permission of the publisher. Copyright 2009 by American Water Works Association Printed in USA c500-09.indd Sec1ii8/31/2009 114801 AM Copyright 2009 American Water Works Association. All Rights Reserved. The Standard is downloaded from Standard Sharing iii Committee Personnel Th e AWWA Standards Committee on Gate Valves and Swing Check Valves, which reviewed and approved this standard, had the following personnel at the time of approval Joseph J. Gemin, Co-Chair Robert L. Gardner, Co-Chair General Interest Members J.M. Assouline,* CH2M HILL, Englewood, Colo. AWWA M.D. Bennett, Mentor, Ohio AWWA R.L. Claudy Jr., Orlando Utilities Commission, Orlando, Fla. AWWA K.G. Clegg, CH2M HILL, Corvallis, Ore. AWWA D. Dieff enbach, Malcolm Pirnie Inc., Phoenix, Ariz. AWWA J.J. Gemin, Earth Tech Canada Inc., Kitchener, Ont. AWWA M.C. Johnson, Utah State University, Water Research Laboratory, Logan, Utah AWWA G.E. Laverick, Underwriters Laboratories Inc., Northbrook, Ill. UL T.J. McCandless,† Standards Engineer Liaison, AWWA, Denver, Colo. AWWA P.I. McGrath Jr., Birmingham, Ala. AWWA T.R. Volz, URS Corporation, Denver, Colo. AWWA M.P. Yoke, Anniston, Ala. AWWA Producer Members J.V. Ballun, Val-Matic Valve Flax or Hemp. MSS† SP-9Spot Facing for Bronze, Iron, and Steel Flanges. MSSSP-60Connecting Flange Joint Between Tapping Sleeves and Tap- ping Valves. SAE AS‡-568Aerospace Size Standard for O-rings. SECTION 3 DEFINITIONS In this standard, the following defi nitions shall apply 1. Antiseize compound A compound that enables nondestructive assembly and disassembly of threaded components. 2. Cosmetic defect A blemish that has no eff ect on the ability of a component to meet the structural design and production test requirements of this standard. If the blemish or the activity of plugging, welding, grinding, or repairing the blemish causes the component to fail these requirements, the blemish shall be considered a structural defect. * Federal Specifi cation available from Naval Publications and s Center, 5801 Tabor Ave., Philadelphia, PA 19120. † Manufacturers Standardization Society of the Valve and Fittings Industry Inc., 127 Park Street N.E., Vienna, VA 22180. ‡ Aerospace Standard available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096. c500-09.indd 48/31/2009 114802 AM Copyright 2009 American Water Works Association. All Rights Reserved. The Standard is downloaded from Standard Sharing METAL-SEATED GATE VALVES FOR WATER SUPPLY SERVICE 5 3. Flanged joint Th e fl anged and bolted joint as detailed in ANSI/ AWWA C110/A21.10 or ASME B16.1, class 125, or Sec. 4.4.3.2 of this standard. 4. Hub-end bell-and-spigot joint Th e poured or caulked joint as described in Sec. 4.4.3.1. 5. Manufacturer Th e party that manufactures, fabricates, or pro- duces materials or products. 6. Mechanical joint Th e gasketed and bolted joint as described in ANSI/ AWWA C111/A21.11. 7. NPS Nominal pipe size. 8. Purchaser Th e person, company, or organization that purchases any materials or work to be pered. 9. Push-on joint Th e single rubber gasket joint as described in ANSI/ AWWA C111/A21.11. 10. Structural defect A fl aw that causes a component to fail the struc- tural design or test requirements of this standard. Th is includes, but is not limited to, imperfections that result in leakage through the walls of a casting, failure to meet minimum wall thickness requirement, or failure to meet production tests. 11. Supplier Th e party that supplies materials or services. A supplier may or may not be the manufacturer. 12. Tapping valves A special gate valve designed with end connec- tions and an unobstructed waterway to provide proper alignment and positioning of a tapping sleeve, valve, and machine for tapping pipe dry or under pressure. SECTION 4 REQUIREMENTS Sec. 4.1 Data to Be Supplied If requested by the purchaser, the manufacturer or supplier shall provide the following ination when supplying metal-seated gate valves. 4.1.1 Catalog data. Th e manufacturer shall supply catalog data, includ- ing illustrations and a parts list that identifi es the materials used for various parts. Th e ination shall be in suffi cient detail to serve as a guide in the assembly and disassembly of the valve and for ordering repair parts. 4.1.2 Weight ination. Th e manufacturer shall provide a statement of the net assembled weight for each size of valve exclusive of joint accessories. c500-09.indd 58/31/2009 114802 AM Copyright 2009 American Water Works Association. All Rights Reserved. 6 AWWA C500-09 4.1.3 Assembly drawings. Th e manufacturer shall to the purchaser one set of drawings showing the principal dimensions, construction details, and materials used for all parts of the valve. Work shall be done and valves shall be provided in accordance with these drawings after the drawings have been reviewed and accepted by the purchaser. Sec. 4.2 Materials 4.2.1 General. Materials shall comply with the requirements of the Safe Drinking Water Act and other federal requirements. Materials used in valves pro- duced according to this standard shall con to the requirements stipulated in the following sections. 4.2.2 Permeation. Th e selection of materials is critical for water service and distribution piping in locations where there is likelihood the pipe will be exposed to signifi cant concentrations of pollutants consisting of low-molecular-weight petro- leum products or organic solvents or their vapors. Research has documented that pipe materials such as polyethylene, polybutylene, polyvinyl chloride, and asbestos cement and elastomers, such as those used in jointing gaskets and packing glands, are subject to permeation by lower-molecular-weight organic solvents or petroleum products. If a water pipe must pass through such a contaminated area or an area subject to contamination, consult with the manufacturer regarding permeation of pipe walls, jointing materials, etc., before selecting materials for use in that area. 4.2.3 Dissimilar metals. In the presence of an electrolyte, direct contact between metals of dissimilar corrosion resistance may result in galvanic corrosion of the more active, less corrosion-resistant material. When dissimilar metals must be used for internal parts, the rate of corrosion shall be reduced as much as practi- cal through the selection of materials that exhibit similar resistance to corrosion, by placing a dielectric material between the metals, or by applying a dielectric coating. When contact between dissimilar metals cannot be avoided, the assembly shall be designed so that the resulting corrosion will be minimized and will not adversely aff ect water quality or result in malfunctioning or premature failure of the assembly. 4.2.4 Mechanical and chemical properties. Th e requirements of ASME, ASTM, AWWA, or other standards to which references are made in this text shall govern the mechanical and chemical characteristics of the valve components. Whenever valve components are made in conance with AWWA, ASME, ASTM, or other standards that include test requirements or testing procedures, the manufacturer or supplier shall comply with these requirements or procedures. c500-09.indd 68/31/2009 114802 AM Copyright 2009 American Water Works Association. All Rights Reserved. The Standard is downloaded from Standard Sharing METAL-SEATED GATE VALVES FOR WATER SUPPLY SERVICE 7 Th e records of all tests shall, if required by the purchaser’s documents, be made available to the purchaser. 4.2.4.1 Gray iron. Gray iron shall equal or exceed the requirement of ASTM A126 class B. 4.2.4.2 Ductile iron. Ductile iron shall con to one of the following standards ASTM A395 or ASTM A536. 4.2.4.3 Copper alloys. Copper alloys used in valves shall comply with the following 4.2.4.3.1 Copper-alloy valve components shall be made to ASTM-recog- nized alloy specifi cations with Unifi ed Numbering System for Metals and Alloys UNS designations. Copper alloys are not limited to those specifi ed in this stan- dard. Copper alloys, however, must meet the perance requirements of this standard, including, but not limited to, minimum yield strength, chemical require- ments, and corrosion resistance. 4.2.4.3.2 Any copper alloy used in the cold-worked condition shall be capable of passing the mercurous nitrate test in accordance with ASTM B154 to minimize susceptibility to stress corrosion. 4.2.4.3.3 Waters in some areas have promoted corrosion in the of dezincifi cation or dealuminization of copper alloy. Th e manufacturer should be notifi ed if this condition exists. Copper alloys that contain more than 16 percent zinc shall not be used in such waters. If aluminum bronze is used, the alloys shall be inhibited against dealuminization. 4.2.4.3.4 Copper alloys that contain more than 16 percent zinc shall not contain less than 57 percent copper. 4.2.4.3.5 Copper alloys that contain 16 percent or less zinc shall not con- tain less than 79 percent copper. 4.2.4.3.6 Valve components manufactured from some grades of manga- nese, bronze, or some other materials are subject to stress corrosion. Th e manufac- turer shall design the valve and select materials to minimize stress corrosion. 4.2.4.4 Carbon steel. Carbon-steel castings shall con to the require- ments of ASTM A27 grade U60-30 or equal. 4.2.4.5 Stainless steel. Stainless steel used in valves shall comply with the following 4.2.4.5.1 Stainless-steel components shall con to the requirements of ASTM A276, ASTM A473, ASTM A582, or ASTM A743/A743M. c500-09.indd 78/31/2009 114802 AM Copyright 2009 American Water Works Association. All Rights Reserved. 8 AWWA C500-09 4.2.4.5.2 Th e chemical composition of stainless-steel valve components shall contain not less than 15 percent chromium or more than 0.25 percent carbon and shall be processed to reduce the ation of chromium carbides. 4.2.4.5.3 Stainless-steel valve components, when used, shall be made to ASTM-recognized alloy specifi cations with metal and alloys in the UNS. Stain- less-steel alloys are not limited to those specifi ed herein. All stainless-steel alloys, however, must meet the perance requirements of this standard, including, but not limited to, minimum yield strength and chemical requirements. 4.2.4.5.4 After fi nal ing and machining, exogenous iron shall be removed from fi nished stainless-steel components that come in contact with potable water, or those components shall be passivated in accordance with ASTM A380. All other stainless-steel components shall be cleaned and descaled per the manufacturer’s requirements. 4.2.4.6 Elastomers. Elastomers shall comply with the following 4.2.4.6.1 Rubber shall be resistant to microbiological attack, copper poi- soning, and ozone attack. 4.2.4.6.2 Rubber compounds shall contain no more than 8 ppm parts per million of copper ion and shall include copper inhibitors to prevent copper degra- dation of the rubber material. 4.2.4.6.3 Rubber compounds shall be capable of withstanding an ozone resistance test when tested in accordance with ASTM D1149. Th e tests shall be conducted o