ASME_B31T-2021.pdf

AN AM E R IC AN NAT IO NAL STANDARDASME B31T-2021(Revision of ASME B31T-2018)StandardToughnessRequirementsfor PipingASME Code for Pressure Piping,B31ASME B31T-2021(Revision of ASME B31T-2018)StandardToughnessRequirementsfor PipingASME Code for Pressure Piping,B31AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USAxDate of Issuance:July 30,2021The next edition of this Standard is scheduled for publication in 2024.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Interpretations arepublished on the Committee web page and under http:/go.asme.org/Interpretations.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 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 2021 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B31 Committee.viIntroduction.viiiSummary of Changes.x1General.12Glossary.13Low-Temperature Ranges and Requirements.14Impact Testing Methods and Acceptance Criteria.65References.8Mandatory AppendicesIImpact Test Exemption Curves.37IIStress Ratio Curves.43IIIMaterial Groupings by T-Number.45Nonmandatory AppendicesAFlowchart of Requirements.53BGuidelines for Establishing T-Number Group.55FiguresI-1Impact Test Exemption Curves for T-Number Groups CS A,CS B,CS C,and CS D(U.S.CustomaryUnits).38I-1MImpact Test Exemption Curves for T-Number Groups CS A,CS B,CS C,and CS D(SI Units).39II-1Stress Ratio Curve(U.S.Customary Units).43II-1MStress Ratio Curve(SI Units).44A-1Flowchart of Requirements.54Tables3.1-1Low-Temperature Service Requirements by Material Group.123.2-1Material Groupings by Material Specification.284.4.2-1CharpyImpactTest(AbsorbedEnergy)TemperatureReductionforMaterialorSpecimens 0.3Temp.,C,WithoutImpactsSR 0.310.90.80.70.60.50.40.3Carbon SteelsCS 55Max.possibleCharpyt 2.5 mmNote(2)294848291044848484848484848104CS 55Max.possibleCharpyt 2.5 mmNote(3)2948291044848484848484848104CS 50Max.possibleCharpyt 2.5 mmNote(2)294848291044848484848484848104CS 50Max.possibleCharpyt 2.5 mmNote(3)2946291044648484848484848104CS 20Max.possibleCharpyt 2.5 mmNote(2)294848291044848484848484848104CS 20Max.possibleCharpyt 2.5 mmNote(3)2929291042934404648484848104CS 20(A)2929292929N/ACS 018181829291823293440484848104CS+20(A)77777N/ACS A10.0Max.possibleCharpyt 0.3Temp.,C,WithoutImpactsSR 0.310.90.80.70.60.50.40.3Carbon Steels(Contd)CS A10.0Max.possibleCharpyt 2.5 mmNote(3)777104712182329404848104CS A11.