-4-1_2009.pdf

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 Stanford 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 STANDARDCopyright 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 distribution 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 actions 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 accredited 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 madeavailableforpublicreviewandcommentthatprovidesanopportunityforadditionalpublicinputfromindustry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assumes any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts 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,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.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 distribution is permitted.Uncontrolled when printed.CONTENTSForeword.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 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.FOREWORDThere are potential hazards associated with the heating of water in a closed vessel,as thepotential for 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 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