ASME_B16.9-2007.pdf

ASME B16.9-2007(Revision of ASME B16.9-2003)Factory-MadeWroughtButtweldingFittingsAN AMERICAN NATIONAL STANDARDThe American Society ofMechanical EngineersASME B16.9-2007(Revision of ASME B16.9-2003)Factory-MadeWroughtButtweldingFittingsAN AMERICAN NATIONAL STANDARDThe American Society ofMechanical EngineersThree Park Avenue.New York,NY 10016Date of Issuance:December 7,2007The next edition of this Standard is scheduled for publication in 2012.There will be no addendaissued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.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 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 endorseany 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 10016-5990Copyright2007byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSivCommittee Roster.Correspondence With the B16 Committeei1Sc0pe.12 Pressure Ratings.13Siz.24 Marking.25 Material.26Fitting Dimensions.27 Surface Contours.38 End Preparation.,.39 Design Proof Test.310 Production Tests.11 Tolerance5,4Figure1 Maximum Envelope for Welding End Transitions.18Tables1Dimensions of Long Radius Elbows.52Dimensions of Long Radius Reducing Elbows.63Dimensions of Long Radius Returns74Dimensions of Short Radius Elbows.75Dimensions of Short Radius 180-deg Returns.86Dimensions of 3D Elbows.87Dimensions of Straight Tees and Crosses.9Dimensions of Reducing Outlet Tees and Reducing Outlet Crosses.109Dimensions of Lap Joint Stub Ends.1310Dimensions of Caps1411Dimensions of Reducers.1512Welding Bevels and Root Face.1713Tolerances19Mandatory AppendicesIInch Tables21References.5Nonmandatory AppendixAQuality System Program.36进FOREWORDIn 1921,the American Engineering Standards Committee,later the American Standards Associa-tion(ASA),organized Sectional Committee B16 to unify and further develop national standardsfor pipe flanges and fittings(and,later,for valves,gaskets,and valve actuators).Cosponsors ofthe B16 Committee were The American Society of Mechanical Engineers(ASME),the Heatingand Piping Contractors National Association now the Mechanical Contractors Association ofAmerica(MCAA),and the Manufacturers Standardization Society of the Valve and FittingsIndustry(MSS).Cosponsors were later designated as cosecretariat organizations.Standardization of welding fittings was initiated in 1937 by a subgroup(designated Subgroup 6)of Subcommittee 3.After consideration of several drafts,a standard was approved by the Commit-tee,cosponsors,and ASA,and published with the designation ASA B16.9-1940.Revisions were made in 1950 and 1955 to add sizes up to NPS 24 and to complete coverageof fittings in some sizes.These revisions were approved and published as ASA B16.9-1951 andASA B16.9-1958.With the subgroup now designated Subcommittee 6(later Subcommittee F),further revisions were begun to clarify the intent of the standard,to add angularity tolerances,and to include fittings of different types(long radius reducing elbows and crosses)and smallersizes(NPS and NPS)This revision was published as ASA B16.9-1964 after ASA approval.After reorganization of ASA,first as the United States of America Standards Institute(USASI),then as the American National Standards Institute(ANSI),with the Sectional Committee beingredesignated as an American National Standards Committee,another revision increasing the sizerange to NPS 48 and revising the text for clarity was approved and published as ANSI B16.9-1971.In 1975,Subcommittee F began a major revision to bring the standard up to date with currentpractice and usage.Common fractions were expressed as decimals(but without intending higherprecision)and metric dimensional equivalents were added.Provisions for step-wise change ofradius for NPS%long radius elbows and 180-deg returns were introduced.Following StandardsCommittee,cosecretariat,and ANSI approval,the revision was published as ANSI B16.9-1978.It was updated by a corrective addendum,B16.9a-1981,issued in February 1982.In 1982,American National Standards Committee B16 was reorganized as an ASME Committeeoperating under procedures accredited by ANSI.In ASME/ANSI B16.9-1986,the text was revisedand inch dimensions were established as the standard.In 1991,the Subcommittee reviewed the document and made a number of revisions that wereincluded in ASME B16.9-1993.Dimensions for short pattern lap joints were also added.In ASME B16.9-2001,short radius elbows and returns were added,which included all dimen-sions and tolerances of ASME B16.28-1994.Metric units were provided as an independent butparallel alternative standard to U.S.Customary units and a Quality System Program appendixwas added.In 2003,the Subcommittee reviewed the document and made a number of revisions.The scopeof the standard was changed to permit fabricated lap joint stub ends employing circumferentialor intersection welds.In 2006,the Subcommittee reviewed the document and made a number of additions andrevisions.Segmental elbow requirements were added as were 3D elbow dimensions.Referencedocuments were updated.This Standard was approved as an American National Standard on May 18,2007.iv