6-25_2012.pdf

AN AMERICAN NATIONAL STANDARD ASME B16.25-2012(Revision of ASME B16.25-2007)Buttwelding EndsCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16.25-2012(Revision of ASME B16.25-2007)ButtweldingEndsAN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016 USACopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Date of Issuance:December 20,2012The next edition of this Standard is scheduled for publication in 2017.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Periodically certain actions of the ASME B16 Committee may be published as Cases.Cases and interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org/as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items,or to correct typographical or grammatical errorsin codes and standards.Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/.There is an option available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.ThisoptioncanbefoundontheappropriateCommitteePageafterselecting“Errata”inthe“PublicationInformation”section.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput 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 anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assume any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME 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 EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2012 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B16 Committee.viSummary of Changes.vii1Scope.12Transition Contours.13Welding Bevel Design.24Preparation of Inside Diameter of Welding End.25Tolerances.3Figures1Maximum 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 Over3 mm(0.12 in.)to 10 mm(0.38 in.),Inclusive.75Weld Bevel Details for GTAW Root Pass Wall Thickness Over10 mm(0.38 in.)to 25 mm(1.0 in.),Inclusive.76Weld Bevel Details for GTAW Root Pass Wall Thickness Over25 mm(1.0 in.).8Table1Dimensions of Welding Ends.9Mandatory AppendicesIInch Table.13IIReferences.18Nonmandatory AppendixAQuality System Program.19iiiCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-FOREWORDIn July 1953,the American Welding Society presented a proposal on Welding End Preparationto Sectional Committee B16 of the American Standards Association(ASA),with the recommenda-tion that it be considered as a candidate for an American Standard.The proposal was expandedto include welding preparation for flanges and valves covered b