1、STD.ASME B16.4-ENGL1998075967006177b9788ASME B16.4-1998(Revision of ASME B16.4-1992)GRAY IRONTHREADED FITTINGSClasses 125 and 250AN AMERICAN NATIONAL STANDARDSThe American Society ofMechanical Engineersoeas。eeegnASoHeaeomSvh ASMESTD.ASME B1b.4-ENGL19980759b700L17771.336Date of Issuance:August 6,1999
2、The 1998 edition of this Standard is being issued with an automatic addendasubscription service.The use of addenda allows revisions made in responseto public review comments or committee actions to be published on a regularyearly basis;revisions published in addenda will become effective 6 monthsaft
3、er the Date of Issuance of the addenda.The next edition of this Standardis scheduled for publication in 2003.ASME issues written replies to inquiries concerning interpretations oftechnical aspects of this Standard.The interpretations will be included withthe above addenda service.ASME is the registe
4、red trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria forAmerican National Standards.The Standards Committee that approved the code or standardwas balanced to assure that individuals from competent and co
5、ncerned interests have had anopportunity to participate.The proposed code or standard was made available for public reviewand 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 i
6、tem,construction,proprietary device.or activity.ASME does not take any position with respect to the validity of any patent rights asserted inconnection with any items mentioned in this document,and does not undertake to insure anyoneutilizing a standard against liability for infringement of any appl
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9、olunteers.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 1999 byTHE AMERICAN SOCIETY OF MECHANICA
10、L ENGINEERSAll Rights ReservedPrinted in U.S.A.wh ASMENo reproduction or networking permitted without license from IHSNot for ResaleSTD.ASME B1b.4-ENGL199807596700b17772272FOREWORDIn the spring of 1921,when the unification and extension of the flanged and threadedfittings standards in force in this
11、country seemed desirable,the American EngineeringStandards Committee subsequently the American Standards Association and currently theAmerican National Standards Institute(ANSI)authorized the organization of a SectionalCommittee on the Standardization of Pipe Flanges and Flanged Fittings.The followi
12、ngorganizations served as joint sponsors:Heating.Piping,and Air Conditioning ContractorsNational Association(later the Mechanical Contractors Association of America),ManufacturersStandardization Society of the Valve and Fittings Industry,and the American Society ofMechanical Engineers.At the second
13、meeting of the Sectional Committee held in New York on December 16,1921.a report was submitted by the Subcommittee on Threaded Fittings.It indicated clearlythat good progress was already being made toward the development of an American Standardfor cast iron threaded fittings intended for services of
14、 125 and 250 lb steam pressure.Thereview of the proposals of the manufacturers Committee of Five was assigned to theSubcommittee on Threaded Fittings,and after a thorough study,it made its report to theSectional Committee.The Standard was finally completed,approved,and published inDecember,1927 with
15、 the designation ASA B16d-1927.To bring this Standard in line with the best current practice,a revision was begun inSeptember,1936,providing for hydraulic service ratings,material specifications,toleranceson alignment,threading of fittings,and dimensions of some additional sizes,as well asdimensiona
16、l tables covering reducing couplings,caps,and closed-and open-pattem retumbends.The revision was approved in March,1941.The Standard was reviewed in 1947 and was approved by the Sectional Committee.Following approval of the sponsor bodies,the Standard was presented for approval as anAmerican Standar
17、d.It received that approval in December.1949,and was given the newdesignation ASA B16.4-1949.A review was started in 1961 by Subcommittee No.2.A draft involving only minorchanges was approved by the Sectional Committee and sponsor bodies.Final ASA approvalwas granted on December 26,1963.As the chang
18、es in organization and standards designation increased,Subcommittee No.2 began a review in 1968.Minor changes included updating references and bringing theStandard into conformance with adopted policies of the B16 Committee.Final approvalwas granted by the American National Standards Institute on Ja
19、nuary 20,1971.In 1975,Subcommittee B(formerly 2),in its regular five-year review of the document.recommended the addition of metric(SI)equivalents and updating of referenced standards.The revised edition received approval by ANSI on August 30.1977.In 1982,American National Standards Committee B16 be
20、came the ASME B16 StandardsCommittee,operating with the same scope under ASME procedures accredited by ANSI.A new revision of the standard.including rationalization of metric equivalent dimensionsand updating of referenced standards,was approved and published as ANSI/ASME B16.4-1985.The 1992 edition
21、 of B16.4 omitted metric units,established U.S.customary units as thestandard,and provided for electrodeposition as an altemative to hot dipping if zinc coatingis required.Editorial revisions were made to clarify and correct the text.Following approvalii闭ASMEith ASMENo reproduction or networking per
22、mited without license from IHSNot for ResaleSTD.ASME B16.4-ENGL 1998 0759670 0617773 109by the Standards Committee and ASME,approval as an American National Standard wasgiven on December 2,1992,with the designation ASME B16.4-1992.In the 1998 edition of ASME B16.4,the list of referenced standards ha
23、s once againbeen updated,a Quality System Program Annex has been added,an issued Interpretationhas been included,and several editorial revisions have been made.Following approval byASME B16 Subcommittee B and B16 Main Committee,ANSI approved this AmericanNational Standard on November 20.1998.Requests for interpretation and suggestions for revision should be sent to the Secretary.B16 Committee,The American Society of Mechanical Engineers.Three Park Avenue,NewYork,NY10016-5990.Not for Resale