1、Date of Issuance:June 8,2007The next edition of this Standard is scheduled for publication in 2012.There will be no addendaissued to this Edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Interpretations are published on the ASME Web sit
2、e under the Committee Pages athttp:/cstools.asme.org as they are issued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that
3、 approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable for public review and comment that provides an opportunity for additional public input from industry,aca
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7、nce with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.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 Mech
8、anical EngineersThree Park Avenue,New York,NY 10016-5990Copyright2007byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.。with ASMENo roproduction or notworking permitled without liconso from IHSNot for ResaleCONTENTSivCommittee Roster.Correspondence With the B16 Commit
9、teevi112 Pressure-Temperature Ratings113 Materia,.,.,.,.,4Size.25 Marking.26Flange Facing Finish.27 Gaskets for Raised Face Flanges.28 Pressure Taps.29 Jack Screw Provision.210 Flange Dimensions.11 Flange Threads.212 Tolerances,.,.,.,3Figures1 Corner Taps92Angular Meter Tap for RTFlanges.93Jack Bolt
10、s9Tables1Class 300 Orifice Flanges,Welding Neck,Slip-On and Threaded.42 Class 600 Orifice Flanges,Welding Neck.53Class 900 Orifice Flanges,Welding Neck.64Class 1500 Orifice Flanges,Welding Neck1。，t。,。,。,75Class 2500 Orifice Flanges,Welding Neck8Mandatory AppendicesIDimensional Data for Classes 300,6
11、00,900,1500,and 2500 Flanges inU.S.Customary Units.11Dimensional Data for Class 400 Flanges in U.S.Customary Units.17III References.1Nonmandatory AppendixA Quality System Program.20i进se with ASMENo roproduction or notworking permitled without liconso from IHSNot for ResaloFOREWORDAugust of 1956 mark
12、ed the first recorded correspondence noting the lack of standardizationfor orifice flanges.There were,and still are,several codes for the performance and calibrationof orifice flanges,but there had been no standardization of the flanges themselves.Over theensuing 3 years,correspondence continued amo
13、ng the Instrument Society of America,AmericanGas Association,and the B16 Standards Committee.On December 3,1959,Subcommittee 3(now Subcommittee C)of B16 authorized the appoint-ment of a Task Force to undertake drafting of a standard.Although the initial work progressedsmoothly,a controversy develope
14、d over the standard size of taps to be specified for the flanges.This required many years to resolve.It was finally achieved in 1973 with the issuance of a draftfrom the Task Force.Comments and objections to this draft from members of Subcommittee Cwere resolved,and a redraft was approved by the Sub
15、committee late in 1974.The B16 StandardsCommittee was balloted in the spring of 1975 and approval was gained.Comments from B16members from the gas industry requested that the Class 400 orifice flange be included,and theB16 Subcommittee C agreed to consider this for a possible addendum.The Standard w
16、as approvedby ANSI on August 15,1975.On April 30,1979,an addenda was issued,which added Class 400 flanges andMandatory Appendix II covering reference documents and organizations.In 1982,American National Standards Committee B16 was reorganized as an ASME Committeeoperating under procedures accredite
17、d by ANSI.In the 1988 edition,figures were added toillustrate jack bolts and corner taps,metric units have been omitted,and references to otherstandards have been updated.Following approval by the B16 Main Committee and the ASMESupervisory Board,the Standard was approved as an American National Stan
18、dard by ANSI onFebruary 18,1988.In 1996,several revisions were made,including the addition of angular meter taps for ringjoint flanges in sizes not previously covered.Following approval by the B16 Main Committeeand the ASME Supervisory Board,the Standard was approved as an American National Standard
19、by ANSI on November 6,1996.This 2006 edition includes metric units as the primary reference units while maintaining U.S.Customary units in either parenthetical or separate forms.Changes to dimensions and nomencla-ture follow that contained within the 2003 edition of ASME B16.5.This includes the chan
20、ge ofminimum flange thickness from C to tr and corrections for Yi and Y2.Class 400 remains in U.S.Customary tables in Mandatory Appendix II but is not given in the metric dimensional tables.There are numerous requirement clarifications and editorial revisions.Requests for interpretations or suggestions for revisions should be sent to the Secretary,B16 Committee,Three Park Avenue,New York,NY 10016-5990.This revision was approved by the American National Standards Institute on November 6,2006.ivNo roproduction or notworking permitled without liconso from IHSNot for Resalo