ASME_B31.1-2020.pdf

Power PipingASME Code for Pressure Piping,B31AN INTE R NAT IO NAL PIPING CO D EASME B31.1-2020(Revision of ASME B31.1-2018)ASME B31.1-2020(Revision of ASME B31.1-2018)Power PipingASME Code for Pressure Piping,B31AN INTERNATIONAL PIPING CODEDate of Issuance:September 30,2020The next edition of this Code is scheduled for publication in 2022.This Code will become effective 6 months after the Date of Issuance.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Code.Interpretations are published on the Committee web page and under http:/go.asme.org/InterpsDatabase.Periodically certain actions of the ASME B31 Committee may be published as Cases.Cases are published on the ASME website under the B31 Committee Page 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 and standards to provide corrections to incorrectly published items,or to correct typographical or grammatical errors in codes and standards.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 each code and standard can be accessed from this main page.There is an option available to automatically receive an e-mail notification when errata are posted to a particular code or standard.This option can be found on the appropriate Committee Page after selecting“Errata”in the“Publication Information”section.ASME is the registered trademark of The American Society of Mechanical Engineers.This international code or standard was developed under procedures accredited as meeting the criteria for American National Standards and it is an American National Standard.The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.The proposed code or standard was made available for public review and comment that provides an opportunity for 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 this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent,nor assume any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent rights,and the risk 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 industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME 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 EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2020 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ixCommittee Roster.xIntroduction.xiiiSummary of Changes.xviChapter IScope and Definitions.1100General.1Chapter IIDesign.16Part 1Conditions and Criteria.16101Design Conditions.16102Design Criteria.18Part 2Pressure Design of Piping Components.23103Criteria for Pressure Design of Piping Components.23104Pressure Design of Components.25Part 3Selection and Limitations of Piping Components.38105Pipe.38106Fittings,Bends,and Intersections.39107Valves.40108Pipe Flanges,Blanks,Flange Facings,Gaskets,and Bolting.41Part 4Selection and Limitations of Piping Joints.42110Piping Joints.42111Welded Joints.42112Flanged Joints.42113Expanded or Rolled Joints.42114Threaded Joints.42115Flared,Flareless,and Compression Joints,and Unions.46116Bell End Joints.47117Brazed and Soldered Joints.47118Sleeve Coupled and Other Proprietary Joints.47Part 5Expansion,Flexibility,and Pipe-Supporting Elements.47119Expansion and Flexibility.47120Loads on Pipe-Supporting Elements.50121Design of Pipe-Supporting Elements.51Part 6Systems.54122Design Requirements Pertaining to Specific Piping Systems.54Chapter IIIMaterials.69123General Requirements.69124Limitations on Materials.70125Creep Strength Enhanced Ferritic Materials.72iiiChapter IVReference Specifications,Codes,and Standards.74126Specifications and Standards for Standard and Nonstandard Piping Components.74Chapter VFabrication,Assembly,and Erection.83127Welding.83128Brazing and Soldering.91129Bending and Forming.94130Requirements for Fabricating and Attaching Pi