1、COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesASME Blb.28 74 m 0757670 05508L2 091 m I AN AMERICAN NATIONAL STANDARD Wrought Steel Buttwelding Short Radius Elbows a
2、nd Returns ASME B16.28-1994(REVISION OF ASME/ANSI 816.28-1986)L 345 East 47th Street,New York,N.Y.1 O01 7 COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesASME B3b-28
3、94 m 0759670 0550833 T28 m Date of Issuance:November 30,1994 The 1994 edition of this Standard is being issued with an automatic addenda subscription service.The use of an addenda allows revisions made in re-sponse to public review comments or committee actions to be published as necessary;revisions
4、 published in addenda will become effective 6 months after the Date of Issuance of the addenda.The next edition of this Standard is scheduled for publication in 1999.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.The interpretations will be
5、included with the above addenda service.Interpretations are not part of the addenda to the Standard.ASME is the registered trademark of The American Society o f Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American National Standard
6、s.The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.The proposed code or standard was made available for public review and comment which provides an opportunity for addition
7、al 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 mentio
8、ned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent,nor assume any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent rights,and the r
9、isk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s1 or person(s)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpreta
10、tions issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual vol-unteers.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.
11、Copyright Q 1994 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesASME BLb.28 94 H
12、 0759670 0550834 964 H FOREWORD(This Foreword is not part of ASME 816.28-1994.)In 1921,the American Engineering Standards Committee,later American Standards Association(ASA),organized Sectional Committee B16 to unify and further develop national standards for pipe flanges and fittings(and,later,for
13、valves,gaskets,and valve actuators).Cosponsors of the B16 Committee were the American Society of Mechanical Engineers(ASME),the Heating and Piping Contractors National Association now Mechanical Contractors Association of America(MCAA),and the Manufacturers Standardization Society of the Valve and F
14、ittings Industry(MSS).Cosponsors were later designated as cosecretariat organizations.In 1959,recognizing the increasing use of short radius buttwelding fittings not covered by ASA B16.9-1958,MSS developed Standard Practice SP-59.In 1963,this Standard was submitted to Subcommittee 6 (now Subcommitte
15、e F),the B16 group re-sponsible for welded fittings,for consideration as a candidate American Standard.Fol-lowing approval by the Committee,cosponsors,and ASA,the standard was published as In 1969,review of the document indicated that no changes were necessaq.After reorganization of ASA,first as the
16、 United States of America Standards Institute(USASI),then as the American National Standards Institute(ANSI),with the Sectional Committee being redesignated as an American National Standards Committee,the reaf-firmation was approved and published as ANSI B16.28-1964 (R1972).Subcommittee F then began a major revision to bring the standard up to date with current practice and usage.Metric dimensional equivalents were also added.Following Standards Committee,cosecretariat,and ANSI approval,the revi
