A112_18_3-2002R2008.pdf

ASME A112.18.3-2002(Revision of ASME A112.18.3M-1996)PERFORMANCE REQUIREMENTSFOR BACKFLOW PROTECTIONDEVICES AND SYSTEMS INPLUMBING FIXTURE FITTINGSA N A M E R I C A N N A T I O N A LS T A N D A R DASME A112.18.3-2002(Revision of ASME A112.18.3M-1996)PERFORMANCE REQUIREMENTSFOR BACKFLOW PROTECTIONDEVICES AND SYSTEMS INPLUMBING FIXTURE FITTINGSA N A M E R I C A N N A T I O N A LS T A N D A R DCopyright 2003 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.REAFFIRMED 2008FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgANAMERICANNATIONALSTANDARDPERFORMANCEREQUIREMENTSFORBACKFLOWPROTECTIONDEVICESANDSYSTEMSINPLUMBINGFIXTUREFITTINGSASMEA112.18.3-2002(RevisionofASMEA112.18.3M-1996)Copyright 2003 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:May 23,2003This Standard will be revised when the Society approves the issuance of a new edition.There willbe no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Interpretations are published on the ASME Web site under the Committee Pages at http:/www.asme.org/codes/as they are issued.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 madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,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 assume 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 2003 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright 2003 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.In memory of,and dedicated to the life of,our dear friend,colleague,and long-standing industry leader,Thomas P.Konen.His contributions to the plumbing industry at large and to this committeewill never be forgotten.Copyright 2003 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.Copyright 2003 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.INTENTIONALLY LEFT BLANK CONTENTSA112 Dedication.iiiForeword.viCommittee Roster.viiCorrespondence With the A112 Committee.ix1Purpose.12S