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18、ms and conditions of this Legal Notice.Revision HistoryANSI Z21.22-2015 CSA 4.4-2015Revisions from the first edition Revision symbol (in margin)Clauses 3, 4.5.2, 4.10.4, and 5.2Standards Update ServiceANSI Z21.22-2015 CSA 4.4-2015July 2015Title: Relief valves for hot water supply systemsTo register
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34、rds Institute, Inc. 25 West 43rd Street, Fourth floor New York, NY 10036ISBN 978-1-77139-949-4 2015 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.Published in July 2015 by CSA Group A not-for-profit p
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36、g as “CSA Group”American National Standards Institute, Inc.Interprovincial Gas Advisory CouncilApproved on June 19, 2015 by ANSIApproved on June 26, 2015 by IGACEffective in Canada March 31, 2017Relief valves for hot water supply systemsANSI Z21.22-2015 CSA 4.4-2015ANSI Z21.22-2015 CSA 4.4-2015Relie
37、f valves for hot water supply systemsJuly 2015 2015 CSA Group 1ContentsInterprovincial Gas Advisory Council (IGAC) 3Technical Committee on Performance and Installation of Gas Burning Appliances and Related Accessories 5CSA Technical Committee on Gas Appliances and Related Accessories 8Joint Z21/CSA
38、Technical Sub-Committee on Standards for Gas-Fired Water Heaters 11Preface 171 Scope 192 Reference publications 203 Definitions 204 Construction 224.1 General 224.2 Connections and flow areas 224.3 Bolts and screws 254.4 Adjustments 254.5 Strength 254.6 Corrosion 264.7 Thermal sensing element tubes
39、264.8 Assembly 264.9 Instructions 264.10 Marking 275 Performance - Pressure relief element 285.1 Installation for test 285.2 Opening, relieving, and reseating pressures 295.3 Continued operation 305.4 Leakage 315.5 Marking material legibility 316 Performance - Temperature relief element 316.1 Reliev
40、ing and reseating temperature 316.2 Discharge capacity 326.3 Continued operation 336.4 Leakage 346.5 Marking material legibility 347 Performance - Vacuum relief valves 347.1 Relieving vacuum 347.2 Air passing capacity 357.3 Leakage of water 35ANSI Z21.22-2015 CSA 4.4-2015Relief valves for hot water
41、supply systemsJuly 2015 2015 CSA Group 27.4 Resistance to deterioration by hot water 358 Manufacturing and production tests 359 Items unique to Canada 36Annex A (informative) Table of conversion factors 37ANSI Z21.22-2015 CSA 4.4-2015Relief valves for hot water supply systemsJuly 2015 2015 CSA Group
42、 3Interprovincial Gas Advisory Council (IGAC)J.R. Marshall Technical Standards b) relevant clause, table, and/or figure number;c) wording of the proposed change; andd) rationale for the change.6) To submit a request for interpretation of this Standard, please send the following information to inquir
43、iescsagroup.org and include “Request for interpretation” in the subject line: a) define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch;b) provide an explanation of circumstances surrounding the actual field condition; andc) where possible
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45、.ca.ANSI Z21.22-2015 CSA 4.4-2015Relief valves for hot water supply systemsJuly 2015 2015 CSA Group 18History of the development of ANSI Z21.22-2015 CSA 4.4-2015Note: This history is informative and is not part of the standard.With the onset of the Free Trade Agreement between the United States and
46、Canada on January 2, 1988, significant attention was given to the harmonization of the United States and Canadian safety standards addressing gas-fired equipment for residential, commercial and industrial applications. It was believed that the elimination of the differences between the standards wou
47、ld remove potential trade barriers and provide an atmosphere in which North American manufacturers could market more freely in the United States and Canada. The harmonization of these standards was also seen as a step toward harmonization with international standards. Joint subcommittees were establ
48、ished to facilitate the standards harmonization process between the United States and Canada.At its October 24, 1995 meeting, the Z21/CGA Joint Subcommittee on Standards for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems appointed an ad hoc working group to prepare a dr
49、aft bi-national standard for Relief Valves. By letter ballot dated May 16, 1997, the joint subcommittee approved sending the draft standard for public review and comment.The first draft harmonized standard was based on current coverage from the American National Standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, Z21.22- 1986, and the Canadian Gas Association Standard for Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum Relief Valves, CAN1-4.4-M80 (R1996).Following reconsideratio
