1、Gray Iron Threaded FittingsClasses 125 and 250AN AMERICAN NATIO NAL STANDARDASME B16.4-2006(Revision of ASME B16.4-1998)Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permit
2、ted.Uncontrolled when printed.ASME B16.4-2006(Revision of ASME B16.4-1998)Gray IronThreadedFittingsClasses 125 and 250AN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford Uni
3、versity User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:March 30,2007The next edition of this Standard is scheduled for publication in 2011.There will be no addendaissued to this edition.ASME issues written replies to inquiries concerning interpre
4、tations 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,and will be published within the next edition of thestandard.ASME is the registered trademark of The American Society of Mechanical En
5、gineers.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 participa
6、te.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 d
7、oes 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 assumes any such liability.U
8、sers 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
9、asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures andpolicies which precludes the issuance of interpretations by individual volunteers.No part of this document may be reproduced
10、 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 2007 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyr
11、ighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B16 Committee.vi1Scope.12PressureT
12、emperature Ratings.13Size.24Marking.25Material.26Dimensions and Tolerances.27Threading.28Ribs.39Plugs,Bushings,and Locknuts.310Face Bevel.311Coatings.3Figures1Identification of Reducing Fittings.22Gaging of Chamfered Internal Threads.3Tables1PressureTemperature Ratings.22Dimensions of Class 125,90-d
13、eg and 45-deg Elbows,Tees,and Crosses(Straight Sizes).43Dimensions of Class 125,90-deg Elbows and Crosses(Reducing Sizes).54Dimensions of Class 125 Tees(Reducing Sizes).65Dimensions of Class 125 Caps,Reducing Couplings,and Closed-and Open-PatternReturn Bends.96Dimensions of Class 250,90-deg and 45-d
14、eg Elbows,Tees,and Crosses(Straight Sizes).107Inspection Tolerances.10Mandatory AppendicesIDimensions of Fittings in U.S.Customary Units.11IIReferences.19Nonmandatory AppendixAQuality System Program.20iiiCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-0
15、5-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORDIn the spring of 1921,when the unification and extension of the flanged and threaded fittings standardsin force in this country seemed desirable,the American Engineering Standard
16、s Committee subsequentlytheAmericanStandardsAssociationandcurrentlytheAmericanNationalStandardsInstitute(ANSI)author-ized the organization of a Sectional Committee on the Standardization of Pipe Flanges and Flanged Fittings.The following organizations served as joint sponsors:Heating,Piping,and Air Conditioning ContractorsNational Association(later the Mechanical Contractors Association of America),Manufacturers Standardiza-tion Society of the Valve and Fittings Industry,and the American Society
