1、AWWA Standard SM Air-Release, Air/Vacuum, and Combination Air Valves for Water and Wastewater Service Effective date Nov. 1, 2015. First edition approved by AWWA Board of Directors Jan. 26, 1992. This edition approved: June 7, 2015. Approved by American National Standards Institute: July 6, 2015. AN
2、SI/AWWA C512-15 (Revision of ANSI/AWWA C512-07)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 administrative information normally contained in
3、 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 constitute endorsement of any product or produc
4、t 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 code of any governmental authority. AWWA standards are intended to represent a consens
5、us 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 in the Official Notice section of Journal - American Water Works Association. The action becomes effective on the fi
6、rst day of the month fol- lowing 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 scope and provisions. An American National Standard is i
7、ntended 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 manufacturing, marketing, purchasing, or using products, processes,
8、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 - aged to state on their own responsibility in advertis
9、ing 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 this standard indicates completion of the ANSI approval pr
10、ocess. 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 American National Standards may receive current informati
11、on 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: 978-1-62576-118-7 eISBN-13, electronic: 978-1-61300-349-7DOI: http:/dx.doi.org/10.12999/AWWA.C512.15 All
12、 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 form of brief excerpts or quotations for review purposes, without the written pe
13、rmission of the publisher. Copyright 2015 by American Water Works Association Printed in USA hours of work by your fellow water professionals. Revenue from the sales of this AWWA material supports ongoing product development. Unauthorized distribution, either electronic or photocopied, is illegal an
14、d hinders AWWAs mission to support the water community. This AWWA content is the product of thousands ofiii Committee Personnel The AWWA Standards Committee on Air Valves, which developed and approved this standard, had the following personnel at the time of approval: Miles E. Wollam, Chair General
15、Interest Members A. Ali, ADA Consulting Ltd., Surrey, B.C., Canada (AWWA) D.E. Barr, ms consultants inc., Columbus, Ohio (AWWA) J.J. Cusack Jr., Bryant Associates, Braintree, Mass. (AWWA) R. DiLorenzo, Mundelein, Ill. (AWWA) D.M. Flancher,* Standards Engineer Liaison, AWWA, Denver, Colo. (AWWA) R.G.
16、 Fuller, HDR Engineering Inc., Denver, Colo. (AWWA) F.H. Hanson, Albert A. Webb Associates, Riverside, Calif. (AWWA) D.L. McPherson, HDR Engineering Inc., Charlotte, N.C. (AWWA) W.L. Meinholz, AB&H, A Donahue Group, Chicago, Ill. (AWWA) J.W. Snead II, JQ Infrastructure, Dallas, Texas (AWWA) T.J. Sto
17、linski Jr., Black & Veatch Corporation, Kansas City, Mo. (AWWA) M. Stuhr, Standards Council Liaison, Portland Water Bureau, Portland, Ore. (AWWA) R.J. Wahanik, Worley Parsons, Reading, Pa. (AWWA) R.A. Ward, Tighe & Bond, Westfield, Mass. (AWWA) M.E. Wollam, MWH Global, Pasadena, Calif. (AWWA) Produc
18、er Members D. Alexander, Cla-Val Company, Costa Mesa, Calif. (AWWA) J.V. Ballun, Val-Matic Valve & Manufacturing Corporation, Elmhurst, Ill. (AWWA) L. Larson, DeZURIK-APCO-Hilton Inc., Sartell, Minn. (AWWA) B.J. Lewis, Crispin Multiplex Manufacturing Company, Berwick, Pa. (AWWA) W.J. Nicholl, GA Ind
19、ustries LLC, Cranberry Township, Pa. (AWWA) T. OShea, DeZURIK-APCO-Hilton Inc., Schaumburg, Ill. (AWWA) K. Sorenson, A.R.I. Flow Control Accessories, South Jordan, Utah (AWWA) J.M. Radtke, Valve Tech Sales, Mountain Top, Pa. (AWWA) * Liaison, nonvoting Alternateiv J.H. Wilber, American AVK, Littleto
20、n, Colo. (AWWA) N. Zloczower, A.R.I. Flow Control Accessories, Israel (AWWA) User Members L. Aguiar, Miami Dade Water and Sewer Department, Miami, Fla. (AWWA) J.H. Bambei Jr., Denver Water Department, Denver, Colo. (AWWA) N.E. Gronlund, East Bay Municipal Utility District, Oakland, Calif. (AWWA) M.
21、MacConnell, Metro Vancouver, Burnaby, B.C., Canada (AWWA) B. Schade, WaterOne, Lenexa, Kan. (AWWA) P. Ries,* Denver Water Department, Denver, Colo. (AWWA) * Alternatev Contents All AWWA standards follow the general format indicated subsequently. Some variations from this format may be found in a par
22、ticular standard. SEC. PAGE SEC. PAGE Foreword I Introduction vii I.A Background . vii I.B History vii I.C Acceptance . viii II Special Issues. . ix II.A Advisory Information on Product Application . ix II.B Venting ix II.C Service ix II.D Pressure Surge Suppression . ix II.E Pipeline Water Column S
23、eparation Protection x II.F Minimum Test Pressure x II.G Maximum Test Pressure x II.H Internal Protective Coating for Wastewater Air Valves . x II.I Releasing or Venting x II.J Chlorine and Chloramine Degradation of Elastomers x III Use of This Standard . x III.A Purchaser Options and Alternatives .
24、 x III.B Modification to Standard xii IV Major Revisions . xii V Comments xii Standard 1 General 1.1 Scope 1 1.2 Purpose . 1 1.3 Application 1 2 References 2 3 Definitions . 4 4 Requirements 4.1 Data to Be Provided by Manufacturer or Supplier 6 4.2 Materials . 6 4.3 General Design and Detailed Desig
25、n Requirements 8 4.4 Welding and Fabrication . 11 4.5 Workmanship and Coatings 12 5 Verification 5.1 Testing 13 5.2 Inspection . 13 5.3 Rejection . 14 6 Delivery 6.1 Marking 14 6.2 Preparation for Shipment. 14 6.3 Affidavit of Compliance 14This page intentionally blank.vii Foreword This foreword is
26、for information only and is not a part of ANSI*/AWWA C512. I. Introduction. I.A. Background. Air valves have been used in the United States for over a century on liquid piping systems that provide water and wastewater service. They perform various functions in providing a safe and efficient operatio
27、n of a liquid piping system. Their functions include (1) automatically releasing small pockets of accumulated air and wastewater gases, and (2) admitting or venting large quantities of air during the draining or filling operation of a liquid piping system. Following are the three basic types of air
28、valves: 1. Air-release valves, also called small-orifice valves, are designed to automati- cally release small pockets of accumulated air and wastewater gases from a liquid pip- ing system while the system operates at a pressure exceeding atmospheric pressure. 2. Air/vacuum valves, also called large
29、-orifice valves, are designed to vent large quantities of air automatically during a liquid piping system filling and to admit large quantities of air automatically when the pressure in the liquid piping system drops below atmospheric pressure. 3. Combination air valves are designed to perform the s
30、ame function as air/ vacuum valves but, in addition, they will automatically release small pockets of accu- mulated air and wastewater gases from a liquid piping system while the system operates at a pressure exceeding atmospheric pressure, like an air-release valve. I.B. History. The AWWA Standards
31、 Committee on Waterworks Air-Release Valves was authorized on Nov. 17, 1984, in response to the water industrys request for a standard on air valves. The first edition of this standard entitled Air-Release, Air/ Vacuum, and Combination Air Valves for Waterworks Service, designated as AWWA/ ANSI C512
32、, was approved by the AWWA Board of Directors on Jan. 26, 1992, the second edition on June 20, 1999, the third edition on June 13, 2004, and the fourth edition on June 24, 2007. In 2009, the committee name was changed to Air Valve Committee to reflect the committees attention to both the water and w
33、astewater industries. This edition entitled Air-Release, Air/Vacuum, and Combination Air Valves for Water and Wastewater Service was approved on June 7, 2015. * American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036.viii I.C. Acceptance. In May 1985, the US Envi
34、ronmental 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 additives. Other members of the original consortium inclu
35、ded the Water Research Foundation (formerly AwwaRF) and the Conference of State Health and Environmental Managers (COSHEM). The American Water Works Association (AWWA) and the Association of State Drinking Water Administrators (ASDWA) joined later. In the United States, authority to regulate product
36、s 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 such products, state and local agencies may us
37、e 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. 3. The standard developed under the direction of NSF: NSF/ANSI 61, Drinking Water System ComponentsHealth
38、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 involved in certifying products in accor- dance with NSF/ANSI 61. Individual states
39、 or local agencies have authority to accept or accredit certification organizations within their jurisdictions. Accreditation of certi- fication organizations may vary from jurisdiction to jurisdiction. Annex A, “Toxicology Review and Evaluation Procedures,” to NSF/ANSI 61 does not stipulate a maxim
40、um 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 guidelines (noncarcinogens) and risk characterization methodology (carcinogens). Use of
41、 Annex A procedures may not always be identical, depending on the certifier. * NSF International, 789 North Dixboro Road, Ann Arbor, MI 48105 (formerly the National Sanitation Foundation). Persons outside the United States should contact the appropriate authority having jurisdiction. Both publicatio
42、ns available from National Academy of Sciences, 500 Fifth Street, NW, Washington, DC 20001.ix AWWA/ANSI C512 does not address additives requirements. Users of this stan- dard should consult the appropriate state or local agency having jurisdiction in order to 1. Determine additives requirements, inc
43、luding 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. An ANSI-approved national standard, NSF/ANSI 372, Drinking Water System Compone
44、ntsLead Content, was published in 2010. On Jan. 4, 2011, legislation was signed revising the definition for “lead free” within the Safe Drinking Water Act (SDWA) as it pertains to “pipe, pipe fittings, plumbing fittings, and fixtures.” The changes went into effect on Jan. 4, 2014. In brief, the new
45、provisions to the SDWA require that wetted surfaces of these products meet a weighted average lead content of not more than 0.25 percent. II. Special Issues. II.A. Advisory Information on Product Application. For additional guidance regarding selecting, sizing, locating, and installing air-release,
46、air/vacuum, and combination air valves, see AWWA Manual M51, Air-Release, Air/Vacuum, and Combination Air Valves. II.B. Venting. When selecting types of air valves, it must be noted that air/ vacuum valves, once closed, will not reopen to vent air and wastewater gases while a liquid piping system op
47、erates at a pressure exceeding atmospheric pressure. To vent air and wastewater gases from a liquid piping system operating at a pressure exceeding atmospheric pressure, an air-release valve or combination air valve is required. Air/ vacuum and combination air valve orifices should be suitably sized
48、 using the manufacturers sizing data, to admit air and to release air and wastewater gases at a required flow rate specific to the system application. II.C. Service. Air valves are designed for either water or wastewater service. The type of service must be specified. II.D. Pressure Surge Suppressio
49、n. Large outlet-orifice sizes on air/vacuum and combination air valves (air-release valves not included) may allow the rapid venting of air and wastewater gases followed by the sudden orifice closure that may cause pipeline pressure surges. To suppress surges, the attachment of throttling devices on the outlet of the air/vacuum valve or combination air valve or the attachment of slow-closing devices on the outlet or inlet of the air/vacuum valve or combination air valve should be considered.x II.E. Pipeline Water Column Separation Protection. On pipeline applications w
