ASME_B16.25-2017.pdf

AN AM E R ICAN NAT IO NAL STANDARDASME B16.25-2017(Revision of ASME B16.25-2012)Buttwelding EndsASME B16.25-2017(Revision of ASME B16.25-2012)ButtweldingEndsAN AMERICAN NATIONAL STANDARDDate of Issuance:December 29,2017The next edition of this Standard is scheduled for publication in 2022.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Periodically certainactionsoftheASMEB16CommitteemaybepublishedasCases.CasesandinterpretationsarepublishedontheASMEWebsiteunder the Committee Pages at http:/cstools.asme.org/as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages to provide corrections toincorrectlypublisheditems,ortocorrecttypographicalorgrammaticalerrorsincodesandstandards.Sucherratashallbeusedon the date posted.TheCommitteePagescanbefoundathttp:/cstools.asme.org/.Thereisanoptionavailabletoautomaticallyreceiveane-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 codeorstandardwasmadeavailableforpublic 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 2017 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B16 Committee.viSummary of Changes.viiiList of Changes in Record Number Order.ix1Scope.12Transition Contours.13Welding Bevel Design.24Preparation of Inside Diameter of Welding End.25Tolerances.3Mandatory AppendicesIInch Table.15IIReferences.22Nonmandatory AppendixAQuality System Program.23Figures1Maximum Envelope for Welding End Transitions.42Bevels for Wall Thickness Over 3 mm(0.12 in.)to 22 mm(0.88 in.),Inclusive.53Weld Bevel Details for Wall Thickness Over 22 mm(0.88 in.).64Weld Bevel Details for GTAW Root Pass Wall Thickness Over 3 mm(0.12 in.)to 10 mm(0.38 in.),Inclusive.75Weld Bevel Details for GTAW Root Pass Wall Thickness Over 10 mm(0.38 in.)to 25 mm(1.0 in.),Inclusive.76Weld Bevel Details for GTAW Root Pass Wall Thickness Over 25 mm(1.0 in.).8Tables1Dimensions of Welding Ends,Metric.9I-1Dimensions of Welding Ends,U.S.Customary.16iiiFOREWORDInJuly1953,theAmericanWeldingSocietypresentedaproposalonWeldingEndPreparationtoSectionalCommitteeB16 of the American Standards Association(ASA),with the recommendation that it be considered as a candidate for anAmerican Standard.The proposal was expanded to include welding preparation for flanges and valves covered by ASAB16.5,SteelPipeFlangesandFlangedFittings,andforfittingscoveredbyASAB16.9,ButtweldingFittings.Considerationwas also given to Pipe Fabrication Institute Standard ES-1.ThethirddraftreviewedbySubcommittee3,Subgroup6(now SubcommitteeF),oftheB16 SectionalCommitteewasforwardedtotheCommittee,cosponsororganizations,andthenASAforapproval.FinalapprovalwasgivenonSeptember14,1955,with the designation ASA B16.25-1955.Revisions were developed as a need for clarification and improvements became known and were approved as ASAB16.25-1958andASA B16.25-1964.After ASAreorganizedastheAmerican National StandardsInstitute(ANSI)andtheSectional Committee became American National Standards Committee B16,a further revision was approved as ANSIB16.25-1972.SubcommitteeFimmediatelybeganworkonamajorexpansionandupdatingoftheStandard,addingillustrationsan