ASME_B31.9-2020.pdf

Building Services PipingASME Code for Pressure Piping,B31AN AM E R IC A N NAT IO NAL STANDARDASME B31.9-2020(Revision of ASME B31.9-2017)ASME B31.9-2020(Revision of ASME B31.9-2017)BuildingServices PipingASME Code for Pressure Piping,B31AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USAxDate of Issuance:December 31,2020The next edition of this Code is scheduled for publication in 2023.This Code will become effective 6 months after the Date ofIssuance.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Code.Interpretations arepublished on the Committee web page and under http:/go.asme.org/InterpsDatabase.Periodically certain actions of theASME B31 Committees may be published as Cases.Cases are published on the ASME website under the B31 CommitteePage at http:/go.asme.org/B31committee as they are issued.Errata to codes and standards may be posted on the ASME website under the Committee Pages of the associated codes andstandardstoprovidecorrectionstoincorrectlypublisheditems,ortocorrecttypographicalorgrammaticalerrorsincodesandstandards.Such errata shall be used on the date posted.The B31 Committee Page can be found at http:/go.asme.org/B31committee.The associated B31 Committee Pages for eachcode and standard can be accessed from this main page.There is an option available to automatically receive an e-mailnotification when errata are posted to a particular code or standard.This option can be found on the appropriate CommitteePage after selecting“Errata”in the“Publication Information”section.ASME is the registered trademark of The American Society of Mechanical Engineers.ThiscodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandards.TheStandardsCommitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfromcompetentandconcernedinterestshavehadanopportunityto participate.The proposed codeorstandardwasmadeavailable forpublic reviewandcommentthatprovidesanopportunityfor additional public input 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 any items mentioned in thisdocument,anddoesnotundertaketoinsureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumeanysuchliability.Usersofacodeorstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtherisk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted as government or industryendorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME proceduresand 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 EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2020 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.viCommittee Roster.viiCorrespondence With the B31 Committee.ixIntroduction.xiSummary of Changes.xiiiChapter 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.21Part 6Systems.25922Design Requirements Pertaining to Specific Piping Systems.25Chapter IIIMaterials.27923Materials General Requirements.27Chapter IVComponent Requirements and Standard Practices.29926Dimensions and Ratings of Components.29iiiChapter VFabrication,Assembly,and Erection.36927Welded Fabrication of Metals.36928Brazing and Soldering of Metals.42929Bending.42930Forming.42931Heat Treatment.42934Fabrication of Nonmetals.43935Assembly.44Chapter VIInspection,Examination,and Testing.46936Inspection and Examination.46937Leak Testing.47Mandatory AppendicesIStress Tables.49IIAllowable Pressures for Nonmetallic,Nonplastic Pressure Piping.58IIIReference Standards.59IVPrep