1、AN AMERICAN NATIO NAL STANDARD ASME A112.4.1-2009Revision of ASME A112.4.1-1993(R2008)Water Heater Relief Valve Drain TubesCopyright 2010 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Sta
2、nford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.ASME A112.4.1-2009Revision of ASME A112.4.1-1993(R2008)Water HeaterRelief ValveDrain TubesAN AMERICAN NATIONAL STANDARDCopyrig
3、ht 2010 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribu
4、tion is permitted.Uncontrolled when printed.Date of Issuance:January 11,2010This Standard will be revised when the Society approves the issuance of a new edition.There willbe no addenda or written interpretations of the requirements of this Standard issued to this edition.Periodically certain action
5、s of the ASME A112 Committee may be published as Cases.Cases arepublished on the ASME Web site under the Committee Pages at http:/cstools.asme.org as they areissued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures a
6、ccredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailableforpublicrev
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10、ts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise
11、,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2010 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright 2010 by the American Society of Mechanical Engineers.N
12、o reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.CONTENTSForew
13、ord.ivCommittee Roster.vCorrespondence With the A112 Committee.vi1General.12Requirements.13Test Methods and Performance Requirements.1iiiCopyright 2010 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material l
14、icensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORDThere are potential hazards associated with the heating of water in a closed vessel,as thepotential for
15、excessive temperature or pressure development within such closed systems is alwayspresent.In order to reduce the hazards associated with water heating,two special amendmentshave been added to the plumbing codes and standards over the past few decades that haveresulted in much safer installations.The
16、 first requirement involved the installation of a high limitcontrol in the water heating assembly,which deactivates the fuel gas control mechanism ifthe water heating device exceeds a specific temperature.The second requirement involved theinstallation of a temperature and pressure relief valve,which is designed to open to atmosphereif the water temperature or pressure within a vessel exceeds the defined specifications of thevalve.Properly inspected and maintained,these devices provide the state