31-9_Edtn_2008.pdf

AN AMERICAN NATIO NAL STANDAR DBuilding Services PipingASME B31.9-2008(Revision of ASME B31.9-2004)ASME Code for Pressure Piping,B31Copyright 2008 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 B31.9-2008(Revision of ASME B31.9-2004)BuildingServices PipingASME Code for Pressure Piping,B31AN AMERICAN NATIONAL STANDARDCopyright 2008 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:July 14,2008The next edition of this Code is scheduled for publication in 2011.This Code will become effective6 months after the Date of Issuance.There will be no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Code.The interpretations are included with this edition.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 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 2008 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright 2008 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.vCommittee Roster.viIntroduction.viiiSummary of Changes.xChapter IScope and Definitions.1900General.1Chapter IIDesign.9Part 1Conditions and Criteria.9901Design Conditions.9902Design Criteria.9Part 2Pressure Design of Piping Components.11903Criteria for Pressure Design of Piping Components.11904Pressure Design of Components.11Part 3Selection and Limitation of Components.14905Pipe.14906Fittings,Bends,and Intersections.15907Valves.15908Flanges,Blanks,Gaskets,and Bolting.15Part 4Selection and Limitation of Joints.15910Piping Joints.15911Welded Joints.15912Flanged Joints.16913Mechanical and Proprietary Joints.16914Threaded Joints.16915Flared,Flareless,and Compression Joints.16916Bell and Spigot Joints.16917Brazed and Soldered Joints.16Part 5Expansion,Flexibility,and Support.17919Expansion and Flexibility.17920Loads on Pipe-Supporting Elements.20921Design of Pipe-Supporting Elements.20Part 6Systems.24922Design Requirements Pertaining to Specific Piping Systems.24Chapter IIIMaterials.26923Materials General Requirements.26Chapter IVComponent Requirements and Standard Practices.28926Dimensions and Ratings of Components.28Chapter VFabrication,Assembly,and Erection.34927Welded Fabrication of Metals.34928Brazing and Soldering of Metals.39929Bending.40930Forming.40931Heat Treatment.40934Fabrication of Nonmetals.40935Assembly.41iiiCopyright 2008 by the American Society of Mechanical Engineers.No reproduction may be