1、AN AMERICAN NATIO NAL STANDAR DNonmetallic Flat Gaskets forPipe FlangesASME B16.21-2005(Revision of ASME B16.21-1992)Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted
2、.Uncontrolled when printed.ASME B16.21-2005(Revision of ASME B16.21-1992)Nonmetallic FlatGaskets for Pipe FlangesThree Park Avenue New York,NY 10016AN AMERICAN NATIONAL STANDARDCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford Universi
3、ty User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:May 31,2005ASME 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 Nat
4、ional Stan-dards.The Standards Committee that approved the code or standard was balanced to assure that individuals from com-petent and concerned interests have had an opportunity to participate.The proposed code or standard was made avail-able for public review and comment that provides an opportun
5、ity for additional 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 wi
6、th any itemsmentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringe-ment of any applicable letters patent,nor assume any such liability.Users of a code or standard are expressly advisedthat determination of the validity of any such paten
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8、 those interpretations of this document issued in accordance 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
9、 permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2005 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.The next edition of this Standard is scheduled for publication in 2010.There will be no ad
10、denda issuedto this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Stan-dard.Interpretations are published on the ASME Web site under the Committee Pages athttp:/www.asme.org/codes/as they are issued.Copyrighted material licensed to Stanford
11、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 .12Types and Sizes.13Materials.14Dimensions an
12、d Tolerances.15Markings.2Tables1Gasket Dimensions for ASME B16.1 Class 25,Cast Iron Pipe Flanges and Flanged Fittings .22Gasket Dimensions for ASME B16.1 Class 125,Cast Iron Pipe Flanges and Flanged Fittings .33Flat Ring Gasket Dimensions for ASME B16.1 Class 250,Cast Iron Pipe Flanges and Flanged F
13、ittings.34Gasket Dimensions for ASME B16.5 Class 150,Pipe Flanges and Flanged Fittings .45Flat Ring Gasket Dimensions for ASME B16.5 Pipe Flanges and Flanged Fittings,Classes 300,400,600,and 900.46Full Face Gasket Dimensions for ASME B16.24,Cast Copper Alloy Pipe Flanges and Flanged Fittings,Classes
14、 150 and 300 .57Flat Ring Gasket Dimensions for ASME B16.47 Series A,Large Diameter Steel Flanges,Classes 150,300,400,and 600.58Flat Ring Gasket Dimensions for ASME B16.47 Series B,Large Diameter Steel Flanges,Classes 75,150,300,400,and 600.69Full Face Gasket Dimensions for MSS SP-51 Class 150LW,Cor
15、rosion-Resistant Cast Flanges and Flanged Fittings .6Mandatory AppendicesIDimensions of Gaskets in U.S.Customary Units.7IIReferences.12Nonmandatory AppendixAQuality System Program .13iiiCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford
16、 University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORDBefore this standard was issued,the individual sizes of gaskets were made to many differentsets of dimensions,based on different concepts of adaptation and functional use on the part ofconsumers as well as manufacturers.In some cases dimensions were shown in American Stan-dards.To standardize gasket sizes,the Standards and Specifications Committee of the Mechani-cal Packing Association started
