1、AN AM E R IC AN NAT IO NAL STANDARDASME B16.9-2018(Revision of ASME B16.9-2012)Factory-Made Wrought Buttwelding FittingsASME B16.9-2018(Revision of ASME B16.9-2012)Factory-MadeWroughtButtweldingFittingsAN AMERICAN NATIONAL STANDARDxDate of Issuance:October 29,2018The next edition of this Standard is
2、 scheduled for publication in 2023.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Periodically certainactionsoftheASMEB16CommitteemaybepublishedasCases.CasesandinterpretationsarepublishedontheASMEwebsiteunder the Committee Pages at http:/cst
3、ools.asme.org/as they are issued.Errata to codes and standards may be posted on the ASME website under the Committee Pages to provide corrections toincorrectlypublisheditems,ortocorrecttypographicalorgrammaticalerrorsincodesandstandards.Sucherratashallbeusedon the date posted.TheCommitteePagescanbef
4、oundathttp:/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 trad
5、emark of The American Society of Mechanical Engineers.ThiscodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandards.TheStandardsCommitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfromcompetentandconcernedinterestshavehadanopportunityto p
6、articipate.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
7、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.Usersofacodeorstandard
8、areexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,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
9、 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 electro
10、nic 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 2018 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.vCommittee Roste
11、r.viCorrespondence With the B16 Committee.viiSummary of Changes.ixList of Changes in Record Number Order.x1Scope.12Pressure Ratings.13Size.24Marking.25Material.36Fitting Dimensions.37Surface Contours.38End Preparation.39Design Proof Test.310Production Tests.511Tolerances.5Mandatory AppendixIReferenc
12、es.28Nonmandatory AppendixAQuality System Program.29Figure8-1Maximum Envelope for Welding End Transitions.24Tables5-1Material Groupings.66.1-1Dimensions of Long Radius Elbows.76.1-2Dimensions of Long Radius Reducing Elbows.86.1-3Dimensions of Long Radius Returns.96.1-4Dimensions of Short Radius Elbo
13、ws.96.1-5Dimensions of Short Radius 180-deg Returns.106.1-6Dimensions of 3D Radius Elbows.116.1-7Dimensions of Straight Tees and Crosses.126.1-8Dimensions of Reducing Outlet Tees and Reducing Outlet Crosses.136.1-9Dimensions of Lap Joint Stub Ends.196.1-10Dimensions of Caps.20iii6.1-11Dimensions of
14、Reducers.218-1Welding Bevels and Root Face.239.2.1-1Testing Coverage.259.3.1-1Test Factor,f,Determination.2511-1Tolerances.26ivFOREWORDIn 1921,the American Engineering Standards Committee,later the American Standards Association(ASA),organizedSectional Committee B16 to unify and further develop nati
15、onal standards for pipe flanges and fittings(and later,forvalves,gaskets,and valve actuators).Cosponsors of the B16 Committee were The American Society of MechanicalEngineers(ASME),the Heating and Piping Contractors National Association now the Mechanical ContractorsAssociation of America(MCAA),and
16、the Manufacturers Standardization Society of the Valve and Fittings Industry(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 Committee,cosponsors,and ASA,and publishedwith the designation ASA B16.9-1940.Revisions were made in 1950 and 1955 to add sizes up to NPS 24 and to complete coverage of fitt
