1、Process PipingASME Code for Pressure Piping,B31AN INTE R NAT IO NAL PIPING CO D EASME B31.3-2020(Revision of ASME B31.3-2018)ASME B31.3-2020(Revision of ASME B31.3-2018)Process PipingASME Code for Pressure Piping,B31AN INTERNATIONAL PIPING CODETwo Park Avenue New York,NY 10016 USAxDate of Issuance:J
2、une 18,2021The next edition of this Code is scheduled for publication in 2022.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 pag
3、e and under http:/go.asme.org/InterpsDatabase.Periodically certain actions of theASME B31 Committee 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 AS
4、ME 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.T
5、he associated B31 Committee Page 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
6、“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 StandardsanditisanAmericanNationalStandard.TheSt
7、andardsCommitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfromcompetentandconcernedinterestshavehadanopportunitytoparticipate.Theproposedcodeorstandardwasmadeavailableforpublicreviewandcommentthatprovidesanopportunityforadditionalpublicinputfromindustry,academia,regulatoryagenci
8、es,andthepublic-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,anddoesnotundertaketoinsureanyoneut
9、ilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumeanysuchliability.Usersofacodeorstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtherisk of infringement of such rights,is entirely their own responsibility.Participation by federal a
10、gency 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 p
11、recludes 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 10016-5990Copyri
12、ght 2021 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.xivCommittee Roster.xviIntroduction.xxSummary of Changes.xxiiChapter IScope and Definitions.1300General Statements.1Chapter IIDesign.11Part 1Conditions and Criteria.11301Design Conditions.1130
13、2Design Criteria.13Part 2Pressure Design of Piping Components.20303General.20304Pressure Design of Components.20Part 3Fluid Service Requirements for Piping Components.32305Pipe.32306Fittings,Bends,Miters,Laps,and Branch Connections.33307Valves and Specialty Components.34308Flanges,Blanks,Flange Faci
14、ngs,and Gaskets.34309Bolting.35Part 4Fluid Service Requirements for Piping Joints.36310General.36311Welded Joints.36312Flanged Joints.36313Expanded Joints.37314Threaded Joints.37315Tubing Joints.37316Caulked Joints.38317Soldered and Brazed Joints.38318Special Joints.38Part 5Flexibility and Support.3
15、8319Piping Flexibility.38320Analysis of Sustained Loads.43321Piping Support.44Part 6Systems.46322Specific Piping Systems.46Chapter IIIMaterials.48323General Requirements.48325Materials Miscellaneous.58iiiChapter IVStandards for Piping Components.59326Dimensions and Ratings of Components.59Chapter VF
16、abrication,Assembly,and Erection.63327General.63328Welding and Brazing.63330Preheating.71331Heat Treatment.73332Bending and Forming.75333Brazing and Soldering.78335Assembly and Erection.78Chapter VIInspection,Examination,and Testing.81340Inspection.81341Examination.81342Examination Personnel.88343Examination Procedures.88344Types of Examination.88345Testing.90346Records.94Chapter VIINonmetallic Piping and Piping Lined With Nonmetals.95A300General Statements.95Part 1Conditions and Criteria.95A301