1、STD.ASME BIb.1-ENGL 1998 0759670 0608183 b51ASME B16.1-1998(Revision of ASME/ANSI B16.1-1989)CAST IRON PIPEFLANGES ANDFLANGED FITTINGSC2S8s25,125,2d250A N A MERICA NNATIONALSTANDA RDThe American Society ofMechanical EngineersCOPYRIGHT 2000 American Society of Mechanical EngineersInformation Handling
2、 Services,September06,200001:17:01STD.ASME B16.1-ENGL19980759b70060B1B4598The American Society ofMechanical EngineersANA ME RICA NN AT I ON AL ST AN D AR DCAST IRON PIPEFLANGES ANDFLANGED FITTINGSCas88825,125,ad250ASME B16.1-1998(Revision of ASME/ANSI B16.1-1989)COPYRIGHT 2000 American Society of Me
3、chanical EngineersInformation Handling Services,September06,200001:17:01STD.ASME BIb.1-ENGL 1998 0759670 0608185 424Date of Issuance:March 19,1999The 1998 edition of this Standard is being issued with an automatic addendasubscription service.The use of addenda allows revisions made in responseto pub
4、lic review comments or committee actions to be published on a regularyearly basis;revisions published in addenda will become effective 6 monthsafter the Date of Issuance of the addenda.The next edition of this Standardis scheduled for publication in 2003.ASME issues written replies to inquiries conc
5、erning interpretations oftechnical aspects of this Standard.The interpretations will be included withthe above addenda service.ASME is the registered trademark of The American Society of Mechanical EngineersThis code or standard was developed under procedures accredited as meeting the criteria forAm
6、erican National Standards.The Standards Committee that approved the code or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate.The proposed code or standard was made available for public reviewand comment that provides an oppo
7、rtunity 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 inconnection wit
8、h any items mentioned in this document,and does not undertake to insure anyoneutilizing a standard against liability for infringement of any applicable Letters Patent,nor assumesany such liability.Users of a code or standard are expressly advised that determination of thevalidity of any such patent
9、rights,and the risk of infringement of such rights,is entirely theirown responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not tobe interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only tho
10、se interpretations issued in accordance with governingASME procedures and policies which precludes the issuance of interpretations by individualvolunteers.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
11、 publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 1999 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.COPYRIGHT 2000 American Society of Mechanical EngineersInformation Handling Services,September06,200001:17:0
12、1STD.ASME B16.1-ENGL 1998 0759670 060818b 360FOREWORD(This Foreword is not part of ASME B16.1-1998.)In 1894,the American Society of Mechanical Engineers(ASME)adopted a standardflange template(ASME Standard)for low-pressure service.A Manufacturers Standardfor pressures up to 250 psi followed in 1901.
13、Around 1910,a group of fittings manufacturersformed an organization that was the forerunner of the present Manufacturers StandardizationSociety of the Valve and Fittings Industry(MSS)and undertook the design of a line offlanged fittings.A document covering this work was published in 1912.During the
14、years 1912-1914,a Joint Committee of the ASME and the ManufacturersCommittee formulated compromise standard dimensions for pipe flanges and flanged fittingsfor use under saturated steam pressures of 125 psi and 250 psi pressure ranges.The JointCommittees report was accepted at a conference attended
15、by representatives of ASME.theManufacturers Committee,the U.S.government,and the National Association of MasterSteam and Hot Water Fitters.ASME published this report as the American Standard forPipe Flanges,Fittings and Their Boltingin 1914.In 1918,work was started on standardsfor 50 Ib steam flange
16、s and for 800 Ib,1200 Ib,and 3000 Ib hydraulic flanges,whichwere subsequently approved by this group.In 1921,the American Engineering Standards Committee,later known as the AmericanStandards Association(ASA),United States of America Standards Institute(USAS),andmore recently,the American National St
17、andards Institute(ANSD),organized SectionalCommittee B16 to unify and further develop national standards for pipe flanges and fittings(and later for valves and gaskets).Cosponsors of the B16 Committee were.ASME,MSS.and the Heating and Piping Contractors Association now the Mechanical ContractorsAsso
18、ciation of America(MCAA).Work already in progress on flanges and flanged fittingswas assigned to Subcommittee I(now Subcommittce A).Following approval by theSubcommittee,the B16 Committec,the cosponsors,and ASA,the standards were publishedin1928.In later work,Subcommittee 1 developed the 25 Ib Flang
19、e and Flanged Fitting Standard(approved in 1931 as ASA B16b2),which replaced the 50 lb standard that had beenoriginally approved in 1918.Work on the 800 lb Hydraulic Flange Standard was publishedas ASA B16b1 in 1931.Revision of thicknesses,tolerances,and service pressure ratingsof the 125 Ib and 250
20、 Ib flanges and flanged fittings led to approval and publication ofASAB16a-1939.An American War Standard entitled Pressure Ratings for Cast Iron Flanges and FlangedFittings,125 lb(ASA B16al)was published in 1943.A complete review of the 125 Iband 250 lb standards resulted in new editions of each:ASA
21、 B16.1-1948 and ASA B16.2-1948.In 1960,editions of B16.I and B16.2 were issued in which ratings were presentedin graphic form and special requirements were added for testing flanges.A review of all cast iron flange and flanged fittings standards initiated in 1962 resultedin the withdrawal of B16.16,
22、300 Ib Refrigerant Flanges and Flanged Fittingsand thecombining of the remaining standards into a single document,with B16.I and B16.2 comingtogether as USAS B16.1-1967.In this edition,the presentation of ratings was restored totabular form.inCOPYRIGHT 2000 American Society of Mechanical EngineersIn
23、formation Handling Services,September06,200001:17:01STD.ASME B1b1-EN6L19980759b7006081872T7The increasing use of higher grades of cast iron necessitated the establishment of asecond set of ratings for the smaller sizes.A revised edition published as ANSI B16.1-1975 incorporated these new ratings alo
24、ng with metric(SI)equivalents for dimensions andminor corrections to the 1967 edition text.In 1982,American National Standards Committee B16 was recognized as an ASMECommittee operating under procedures accredited by ANSI.Following approval by theASME B16 Subcommittee A and B16 Committee,ANSI approv
25、ed ASME/ANSI B16.1-1989 on March 8,1989.Changes included revised marking requirements,revised bolt lengthincrements(in.rather than in.),elimination of metric equivalents,a correction of theClass 800 flange raised face height to 0.25 in.from the 0.06 in.shown previously,andeditorial changes to the te
26、xt.In the 1998 edition of ASME B16.1,Reference Standards have been updated,a QualitySystem Program Annex has been added,Class 800 has been deleted,and several editorialrevisions have been made.Following approval by ASME B16 Subcommittee B and B16Main Committee,ANSI approved this American National St
27、andard on November 20,1998.Requests for interpretation or suggestions for revision should be sent to the Secretary,B16 Committee,The American Society of Mechanical Engineers,Three Park Avenue,NewYork,NY10016-5990.RATINGS OF ASME B16.1 VERSUS ANSI/AWWA A21.10Attention is directed to an apparent confl
28、ict in ambient temperature pressure ratings forflanged fittings between ASME B16.1 and ANSI/AWWA A21.10,Gray Iron and DuctileIron Fittings,2 in.through 48 in.for Water and Other Liquids.The scope of ANSI/AWWA A21.10 limits that standard to fittings for use with grayiron and ductile iron pipe for wat
29、er and other liquids at rated working pressures of 150psi and 250 psi.The ratings of these fittings were established on the basis of hydrostatictesting of fittings to bursting,and do provide a factor of safety of at least 3.0 at the ratedworking pressure and at ambient temperature.ASME B16.1 covers
30、both separate flanges and flanged fittings for more general serviceat ambient and elevated temperatures.The pressure ratings set forth are not based uponburst strength,but have evolved over an extended period of time of satisfactory performancein a wide range of general service conditions.The rating
31、s encompass pressure combinedwith elevated temperature,stresses imposed by piping,thermal stresses due to temperaturevariations,and many other conditions causing stress in the flange or fitting.ivCOPYRIGHT 2000 American Society of Mechanical EngineersInformation Handling Services,September06,200001:17:01
