1、 AWWA Standard SM Dual-Disc Swing-Check Valves for Waterworks Service Effective date: Aug. 1, 2013. First edition approved by AWWA Board of Directors Jan. 27, 2008. This edition approved Jan. 20, 2013. Approved by American National Standards Institute May 28, 2013. ANSI/AWWA C518-13 (Revision of ANS
2、I/AWWA C518-08) Copyright 2013 American Water Works Association. All Rights Reserved. ii AWWA Standard This document is an American Water Works Association (AWWA) standard. It is not a specification. AWWA standards describe minimum requirements and do not contain all of the engineering and administr
3、ative information normally contained in specifications. The AWWA standards usually contain options that must be evaluated by the user of the standard. Until each optional feature is specified by the user, the product or service is not fully defined. AWWA pub- lication of a standard does not constitu
4、te 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 stand
5、ards 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 official notice of action will be placed on the first page of the Official Notice section of Journal - American Water
6、 Works Association. The action becomes effective on the first day of the month following the month of Journal - American Water Works Association publication of the official notice. American National Standard An American National Standard implies a consensus of those substantially concerned with its
7、scope and provisions. An American 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 ap - proved the standard or not, from manufacturin
8、g, marketing, purchasing, or using products, processes, or procedures not conforming 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 conformity with an American National Standard are encour
9、 - aged to state on their own responsibility in advertising and promotional materials or on tags or labels that the goods are produced in conformity with particular American National Standards. Caution n oti Ce : The American National Standards Institute (ANSI) approval date on the front cover of th
10、is 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 reaffirm, revise, or withdraw this standard no later than five years from the date of ANSI approval. Purchasers of A
11、merican National Standards may receive current information 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, or emailing infoansi.org. ISBN-13, print: 978-1-58321-946-1 eISBN-13, electronic: 978-1-
12、61300-236-0 ISBN-10, print: 1-58321-946-3 eISBN-10, electronic: 1-61300-236-X All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information or retrieval system, except in the
13、 form of brief excerpts or quotations for review purposes, without the written permission of the publisher. Copyright 2013 by American Water Works Association Printed in USA Copyright 2013 American Water Works Association. All Rights Reserved. iii The AWWA Standards Subcommittee on Swing-Check Valve
14、s, which reviewed and approved this standard, had the following personnel at the time of approval: John V. Ballun, Chair General Interest Members G.E. Laverick, Underwriters Laboratories Inc., Northbrook, Ill. (UL) R.L. Gardner,* Standards Council Liaison, Wannacomet Water Company, Nantucket, Mass.
15、(AWWA) Producer Members A. Abuelle, Mueller Company, Aurora, Ill. (AWWA) J.V. Ballun, Val-Matic Valve & Manufacturing Corporation, Elmhurst, Ill. (AWWA) D. Burczynski, Kenney Valve, Elmira, N.Y. (AWWA) L.C. Carl, Elmira, N.Y. (AWWA) L.W. Fleury Jr., Mueller Group, Smithfield, R.I. (AWWA) L. Larson,
16、DeZURIK, Sartell, Minn. (AWWA) R.L. Larkin, American Flow Control, Birmingham, Ala. (AWWA) N. Peyton, Mueller Company, Chattanooga, Tenn. (AWWA) J.H. Wilber, American AVK, Littleton, Colo. (AWWA) T. OShea, DeZURIK, Schaumburg, Ill. (AWWA) The AWWA Standards Committee on Gate Valves and Swing-Check V
17、alves, which reviewed and approved this standard, had the following personnel at the time of approval: Joseph J. Gemin, Chair Thomas M. Bowen, Vice-Chair Roland L. Larkin, Secretary General Interest Members J.M. Assouline, CH2M HILL, Englewood, Colo. (AWWA) M.D. Bennett, MWH, Cleveland, Ohio (AWWA)
18、* Liaison, nonvoting Alternate Committee Personnel Copyright 2013 American Water Works Association. All Rights Reserved. iv R.L. Claudy Jr., Orlando, Fla. (AWWA) K.G. Clegg, CH2M HILL, Corvallis, Ore. (AWWA) D. Dieffenbach, Malcolm Pirnie/ARCADIS, Phoenix, Ariz. (AWWA) J.J. Gemin, EarthTech (Canada)
19、, Kitchener, Ont. (AWWA) M.C. Johnson, Utah State University, 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,
20、 Colo. (AWWA) M.P. Yoke, Anniston, Ala. (AWWA) Producer Members J.V. Ballun, Val-Matic Valve & Manufacturing Corporation, Elmhurst, Ill. (AWWA) J. Bolender, J&S Valve, Inc., Huffman, Texas (AWWA) L.W. Fleury Jr., Mueller Group, Smithfield, R.I. (AWWA) S. Flora, M&H Valve Company, Anniston, Ala. (AWW
21、A) T.C. Harbour, Clow Valve Company, Oskaloosa, Iowa (MSS) T.R. Ingalls, East Jordan Iron Works Inc., Chicago, Ill. (AWWA) R. Looney, American AVK Company, Fresno, Calif. (AWWA) T.J. Mettler, Waterous Company, South St. Paul, Minn. (AWWA) D.B. Scott, American Flow Control, Birmingham, Ala. (AWWA) J.
22、H. Wilber, American AVK, Littleton, Colo. (AWWA) K.J. Wright, East Jordan Iron Works Inc., East Jordan, Mich. (AWWA) User Members T.M. Bowen, Manchester Water Works, Manchester, N.H. (AWWA) R.L. Gardner,* Standards Council Liaison, Wannacomet Water Company, Nantucket, Mass. (AWWA) K.W. Gruber, East
23、Bay Municipal Utility District, Oakland, Calif. (AWWA) K.S. Jeng-Bullock, City of Houston, Houston, Texas (AWWA) M. MacConnell, Metro Vancouver, Burnaby, B.C. (AWWA) J.S. Olson, Denver Water, Denver, Colo. (AWWA) D.M. Rausch, Aurora, Colo. (AWWA) *Liaison, nonvoting Alternate Copyright 2013 American
24、 Water Works Association. All Rights Reserved. v Contents All AWWA standards follow the general format indicated subsequently. Some variations from this format may be found in a particular standard. SEC. PAGE SEC. PAGE Foreword I Introduction vii I.A Background .vii I.B History vii I.C Acceptance vi
25、i II Special Issues. .ix II.A General ix II.B Advisory Information on Product Application .ix III Use of This Standard .x III.A Purchaser Options and Alternatives .x III.B Modification to Standard .xi IV Major Revisions xi V Comments .xi Standard 1 General 1.1 Scope 1 1.2 Purpose .2 1.3 Application
26、2 2 References 2 3 Definitions .3 4 Requirements 4.1 Permeation 4 4.2 Data to Be Provided by the Manufacturer 4 4.3 Materials .5 4.4 General Design .6 4.5 Workmanship and Coating .9 5 Verification 5.1 Inspection .9 5.2 Testing 9 5.3 Notice of Nonconformance .10 6 Delivery 6.1 Marking 11 6.2 Shipping
27、 11 6.3 Affidavit of Compliance 11 Appendix A Installation, Operation, and Maintenance of Dual-Disc Swing-Check Valves 13 Tables 1 End-to-End Dimensions for Wafer and Threaded-Lug Valves 6 2 Valve Test Cycles Required 10 Copyright 2013 American Water Works Association. All Rights Reserved. This page
28、 intentionally blank. Copyright 2013 American Water Works Association. All Rights Reserved. vii Foreword This foreword is for information only and is not a part of ANSI*/AWWA C518. I. Introduction. I.A. Background. Dual-disc swing-check valves have been commonly used on pump discharge applications i
29、n the waterworks industry for more than half a century. These check valves are designed to prevent backflow by automatically closing rapidly on flow-reversal. They provide tight shutoff while requiring relatively little space for installation. I.B. History. The need for standardization of dual-disc
30、swing-check valves was recognized by the American Water Works Association (AWWA) in 1992. The AWWA Gate and Check Valve Committee worked to publish this first edition of ANSI/AWWA C518 beginning in 2003. It was approved by the AWWA Board of Directors on Jan. 27, 2008. This edition was approved on Ja
31、n. 20, 2013. I.C. Acceptance. In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF) to develop voluntary third-party consensus standards and a certification program for direct and indirect drinking water addi
32、tives. Other members of the original consortium included the Water Research Foundation (formerly AwwaRF) and the Conference of State Health and Environmental Managers (COSHEM). The American Water Works Association and the Association of State Drinking Water Administrators (ASDWA) joined later. In th
33、e United States, authority to regulate products for use in, or in contact with, drinking water rests with individual states. Local agencies may choose to impose requirements more stringent than those required by the state. To evaluate the health effects of products and drinking water additives from
34、such products, state and local agencies may use various references, including 1. An advisory program formerly administered by USEPA, Office of Drinking Water, discontinued on Apr. 7, 1990. 2. Specific policies of the state or local agency. * American National Standards Institute, 25 West 43rd Street
35、, Fourth Floor, New York, NY 10036. Persons outside the United States should contact the appropriate authority having jurisdiction. Copyright 2013 American Water Works Association. All Rights Reserved. viii 3. Two standards developed under the direction of NSF, NSF * /ANSI 60, Drinking Water Treatme
36、nt ChemicalsHealth Effects, and NSF/ANSI 61, Drinking Water System ComponentsHealth Effects. 4. Other references, including AWWA standards, Food Chemicals Codex, Water Chemicals Codex, and other standards considered appropriate by the state or local agency. Various certification organizations may be
37、 involved in certifying products in accor- dance with NSF/ANSI 61. Individual states or local agencies have authority to accept or accredit certification organizations within their jurisdiction. Accreditation of certi- fication organizations may vary from jurisdiction to jurisdiction. Annex A, “Toxi
38、cology Review and Evaluation Procedures,” to NSF/ANSI 61 does not stipulate a maximum allowable level (MAL) of a contaminant for substances not regulated by a USEPA final maximum contaminant level (MCL). The MALs of an unspecified list of “unregulated contaminants” are based on toxicity testing guid
39、elines (noncarcinogens) and risk characterization methodology (carcinogens). Use of Annex A procedures may not always be identical, depending on the certifier. ANSI/AWWA C518 does not address additives requirements. Thus, users of this standard should consult the appropriate state or local agency ha
40、ving jurisdiction in order to 1. Determine additives requirements, including applicable standards. 2. Determine the status of certifications by parties offering to certify products for contact with, or treatment of, drinking water. 3. Determine current information on product certification. In an alt
41、ernative approach to inadvertent drinking water additives, some jurisdic- tions (including California, Maryland, Vermont, and Louisiana at the time of this writing) are calling for reduced lead limits for materials in contact with potable water. Various third-party certifiers have been assessing pro
42、ducts against these lead content criteria, and a new ANSI-approved national standard, NSF/ANSI 372, Drinking Water System ComponentsLead Content, was published in 2010. On Jan. 4, 2011, legisla- tion was signed revising the definition for “lead free” within the Safe Drinking Water Act (SDWA) as it p
43、ertains to “pipe, pipe fittings, plumbing fittings, and fixtures.” The changes are due to go into effect on Jan. 4, 2014. In brief, the new provisions to the * NSF International, 789 N. Dixboro Road, Ann Arbor, MI 48105. Both publications available from National Academy of Sciences, 500 Fifth Street
44、, N. W., Washington, DC 20001. Copyright 2013 American Water Works Association. All Rights Reserved. ix SDWA require that these products meet a weighted average lead content of not more than 0.25 percent. II. Special Issues. II.A. General. Conditions under which a valve is to be operated must be eva
45、luated carefully by the purchaser. The evaluations must include the determination of the hydraulic characteristics of the system in which the valve will be installed and the operation of the valve, including (1) the maximum transient and static differential pressure across the valve disc and (2) min
46、imum and maximum flow through the valve under the most adverse operating conditions. Hydraulic testing, flow capacities, and valve characteristics are based on the flow upstream of a valve being uniform and undisturbed, like the flow produced by a constant-diameter, straight pipe of at least six dia
47、meters. Piping configurations that produce a nonuniform or turbulent flow pattern upstream of the valve can create dam- aging vibrations, increase head loss, and increase stresses in valve components. II.B. Advisory Information on Product Application. This standard does not describe all possible app
48、lications or manufacturing technologies. The purchaser should identify special requirements and required deviations from this standard and include appropriate language in purchase documents. Refer to Sec. III.A in this foreword. Other advisory information is provided below. 1. Check valves may be su
49、bject to excessive wear if there is insufficient flow to open the valve fully. Manufacturers can supply information during the valve sizing process to prevent this from occurring. 2. These valves are designed for use with clean water and installation in hori- zontal pipelines with the hinge pin oriented in the vertical or vertical lines with flow upward. If installed in a flow-down application, the valves may not have sufficient spring torque to close. 3. These valves are sometimes used for air blower discharge service and there- fore are subject
