1、Metallic Gaskets for Pipe FlangesRing-Joint,Spiral-Wound,and JacketedAN AMERICAN NATIO NAL STANDARDASME B16.20-2007(Revision of ASME B16.20-1998)ASME B16.20-2007(Revision of ASME B16.20-1998)Metallic Gasketsfor Pipe FlangesRing-Joint,Spiral-Wound,andJacketedAN AMERICAN NATIONAL STANDARD-,-,-Date of
2、Issuance:May 19,2008The next edition of this Standard is scheduled for publication in 2013.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 site under
3、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 approve
4、d 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 forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,academia,regulat
5、ory 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 anyitems mentioned in this document,and does not undertake
6、to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assume any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely
7、their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with
8、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 Mechanical En
9、gineersThree Park Avenue,New York,NY 10016-5990Copyright 2008 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B16 Committee.viImportant Information Concerning Use of Asbestos or Alternative Materials.vii1S
10、cope.12Ring-Joint Gaskets.13Spiral-Wound Gaskets.24Jacketed Gaskets.3Tables1Maximum Hardness for Ring Gaskets.12Ring Gasket Markings.23Type R Ring Gasket Dimensions and Tolerances.44Pipe Sizes for Type R Ring Gaskets Suitable for Referenced Standards.75Type RX Ring Gasket Dimensions and Tolerances.9
11、6Pipe Sizes for Type RX Ring Gaskets Suitable for Referenced Standards.117Type BX Ring Gasket Dimensions and Tolerances.128Pipe Sizes for Type BX Ring Gaskets Suitable for Referenced Standards.139Dimensions for Spiral-Wound Gaskets Used With ASME B16.5 Flanges.1410Dimensions for Spiral-Wound Gaskets
12、 Used With ASME B16.47 Series A Flanges.1611Dimensions for Spiral-Wound Gaskets Used With ASME B16.47 Series B Flanges.1812Inner-Ring Inside Diameters for Spiral-Wound Gaskets for Use With ASME B16.5Flanges.2013Inner-Ring Inside Diameters for Spiral-Wound Gaskets Used Between ASMEB16.47 Series A Fla
13、nges.2114Inner-Ring Inside Diameters for Spiral-Wound Gaskets Used Between ASMEB16.47 Series B Flanges.2215Minimum Pipe Wall Thickness Suitable for Use of Spiral-Wound Gaskets WithInner Rings for ASME B16.5 Flanges.2316Maximum Bore of ASME B16.5 Flanges for Use With Spiral-Wound Gaskets.2417Maximum
14、Bore of ASME B16.47 Series A Flanges for Use WithSpiral-Wound Gaskets.2518Maximum Bore of ASME B16.47 Series B Flanges for Use WithSpiral-Wound Gaskets.2619Color Coding and Abbreviations for Spiral-Wound Gasket Materials.2720Example Markings for Spiral-Wound Gaskets.2821Jacketed Gasket Dimensions fo
15、r ASME B16.5 Flanges.2922Jacketed Gasket Dimensions for ASME B16.47 Series A Flanges.3023Jacketed Gasket Dimensions for ASME B16.47 Series B Flanges.3124Abbreviations for Identifying Materials for Jacketed Gaskets.3225Example Markings for Jacketed Gaskets.32Mandatory AppendicesIDimensions of Gaskets
16、 in U.S.Customary Units.33IIReferences.54Nonmandatory AppendixAQuality System Program.55iii-,-,-FOREWORDRing-joint gaskets and grooves probably originated in the boiler field,where they were usedin various forms for manhole covers,autoclaves,and other closures;however,it was in the oilindustry(both
17、in the production and refining of oil)that they received the greatest recognitionand were developed into their present form.Their use expanded steadily as temperatures andpressures were increased in steam plants.Tests examining their application in flanges and valveswere conducted as early as 1928.I
18、n June 1936,the American Petroleum Institute(API)issued Tentative Standard 5-G-3 on Ring-Joints for Steel Flanges and Flange Unions for use with API Tubular Goods.This standard wasknown as API Specification 6B,Ring-Joint Flanges.Following the acceptance of ring-joints forflanges and valves by API an
19、d the issuance of their standard,ASA B16e on Steel Pipe Flangesand Flanged Fittings was revised to include them,and the 1939 edition included standarddimensions for a full line of ring-joint flanges based on the API standard.Development workcontinued and API formulated Standard 6E,Specification for
20、Wellhead Equipment,whichincluded ring-joints not covered in ASA B16e-1939.In 1949,the American Standards Association(ASA),Sectional Committee B16,Subcommittee3,Steel Flanges and Flanged Fittings,assembled the available information on ring-joint gasketsinto a single standard.ASA approval was granted
21、on April 30,1952,with the designation ASAB16.20-1952.An updated version was submitted and ASA approval was granted on April 4,1955,with thedesignation ASA B16.20-1955.Ring gaskets for Class 900(900 lb at that time)in sizes NPS 26through 36 were added and ASA approval was granted on April 2,1956.The
22、standard wasreviewed in 1962 and approval was granted by the ASA on April 25,1963.The standard was again reviewed and approval was granted by the American National Stan-dards Institute(ANSI)on April 25,1973,with the designation of an American National Standard.API requested that ASME convert their g
23、asket standard,API 601,into an ASME AmericanNational Standard.As a result of that request,the standard was expanded to include requirementsfor spiral-wound and jacketed gaskets that were formerly listed in API 601,7th edition,1988.Also,ring-joint groove dimensions were not included,because they were
24、 included in ASME/ANSI B16.5-1988,titled Pipe Flanges and Flanged Fittings,and ASME B16.47-1990,titled LargeDiameter Steel Flanges.The 1993 edition was approved by the B16 Standards Committee and,following approval byASME,approval by ANSI was given on January 22,1993,with the designation ASME B16.20
25、-1993.In the 1998 edition of ASME B16.20,reference standards were updated,a quality systemprogram annex was added,inner ring inside diameters for spiral-wound gaskets were revised,and several editorial revisions were made.Following approval by ASME B16 Subcommittee Gand the B16 Main Committee,ANSI a
26、pproved this American National Standard on November20,1998.In 2007,the standard adopted metric dimensions as an independent standard to the U.S.Customary units;Mandatory Appendix I has been added to cover dimensional tables in U.S.Customary units.Following approval by B16 Subcommittee G,the Standard
27、s Committee,andASME,ANSI approved this American National Standard on October 19,2007.ivASME B16 COMMITTEEStandardization of Valves,Flanges,Fittings,and Gaskets(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSH.R.Sonderegger,ChairM.L.
28、Nayyar,Vice ChairU.DUrso,SecretarySTANDARDS COMMITTEE PERSONNELR.W.Barnes,ANRIC Enterprises,Inc.W.B.Bedesem,ExxonMobil Research&Engineering Co.M.Clark,NIBCO,Inc.U.DUrso,The American Society of Mechanical EngineersC.E.Floren,Mueller Co.D.R.Frikken,Becht Engineering Co.G.G.Grills,U.S.Coast GuardA.Hami
29、lton,American Bureau of ShippingM.L.Henderson,Forgital USAG.A.Jolly,Vogt Valves/FlowserveM.Katcher,Haynes InternationalW.G.Knecht,ConsultantW.N.McLean,Newco ValvesT.A.McMahon,Fisher Controls International,Inc.M.L.Nayyar,Bechtel Power Corp.J.D.Page,U.S.Nuclear Regulatory CommissionR.A.Schmidt,Trinity
30、-LadishH.R.Sonderegger,Anvil International,Inc.W.M.Stephan,Flexitallic LPT.F.Stroud,Ductile Iron Pipe Research AssociationR.E.White,Richard E.White&Associates PCD.A.Williams,Southern Co.ServicesSUBCOMMITTEE G GASKETS FOR FLANGED JOINTSW.M.Stephan,Chair,Flexitallic LPC.B.Gillis,Vice Chair,Teadit Nort
31、h AmericaT.Lazar,Secretary,The American Society of Mechanical EngineersK.A.Benton,ConsultantD.R.Frikken,Becht Engineering Co.W.E.Holden,Solutia,Inc.K.Kolb,Lamons Gasket Co.E.J.Lain,Flint Hills ResourcesD.H.Monroe,ConsultantR.T.Mueller,ConsultantP.S.Petrunich,Fluid Sealing AssociationM.Pollock,Grafte
32、ch InternationalD.F.Reid,Virginia Sealing ProductsJ.T.White,Puget Sound Naval Shipyardv-,-,-CORRESPONDENCE WITH THE B16 COMMITTEEGeneral.ASME Standards are developed and maintained with the intent to represent theconsensus of concerned interests.As such,users of this Standard may interact with the C
33、ommitteeby requesting interpretations,proposing revisions,and attending Committee meetings.Corre-spondence should be addressed to:Secretary,B16 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York,NY 10016-5990As an alternative,inquiries may be submitted via email
34、 to:SecretaryB16asme.org.Proposing Revisions.Revisions are made periodically to the Standard to incorporate changesthat appear necessary or desirable,as demonstrated by the experience gained from the applicationof the Standard.Approved revisions will be published periodically.The Committee welcomes
35、proposals for revisions to this Standard.Such proposals should beas specific as possible,citing the paragraph number(s),the proposed wording,and a detaileddescription of the reasons for the proposal,including any pertinent documentation.Interpretations.Upon request,the B16 Committee will render an i
36、nterpretation of any require-ment of the Standard.Interpretations can only be rendered in response to a written request sentto the Secretary of the B16 Standards Committee.The request for interpretation should be clear and unambiguous.It is further recommendedthat the inquirer submit his/her request
37、 in the following format:Subject:Cite the applicable paragraph number(s)and the topic of the inquiry.Edition:Cite the applicable edition of the Standard for which the interpretation isbeing requested.Question:Phrase the question as a request for an interpretation of a specific requirementsuitable fo
38、r general understanding and use,not as a request for an approvalof a proprietary design or situation.The inquirer may also include any plansor drawings that are necessary to explain the question;however,they shouldnot contain proprietary names or information.Requests that are not in this format will
39、 be rewritten in this format by the Committee priorto being answered,which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available.Further,persons a
40、ggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee.ASME does not“approve,”“certify,”“rate,”or“endorse”any item,construction,proprietary device,or activity.Attending Committee Meetings.TheB16StandardsCommitteeregularlyholdsmeetings,whichare open to the public.Pers
41、ons wishing to attend any meeting should contact the Secretary ofthe B16 Standards Committee.vi-,-,-IMPORTANT INFORMATION CONCERNING USE OFASBESTOS OR ALTERNATIVE MATERIALSAsbestos is referenced for use as a filler material in metallic gaskets.It has served as a universalsealingmaterial,compatiblewi
42、thmostfluidservices.Ithasbeenofextremeusefulnessinminimiz-ing fire hazards.Certain serious adverse health effects are associated with asbestos,among them the seriousand often fatal diseases of lung cancer,asbestosis,and mesothelioma(a cancer of the chest andabdominal linings).The degree of exposure
43、to asbestos varies with the product and the workpractices involved.Consult the most recent edition of the Occupational Safety and Health Administration,U.S.Department of Labor,Occupational Safety and Health Standard for Asbestos,Tremolite,Antho-phyllite,and Actinolite,29 Code of Federal Regulations
44、Section 1910.1001;the U.S.EnvironmentalProtection Agency National Emission Standard for Asbestos,40 Code of Federal RegulationsSections 61.140 through 61.156;and the proposed rule by the U.S.Environmental ProtectionAgency proposing labeling requirements and phased banning of asbestos products,publis
45、hed at51 Federal Register 3738-3759(January 29,1986).There are currently in use and under development a number of substitute materials to replaceasbestos in certain applications.Manufacturers and users are encouraged to develop and useeffective substitute materials that can meet the specifications f
46、or,and operating requirements of,the equipment to which they would apply.Informationconcerningsafetyandhealthrisksandproperprecautionswithrespecttoparticularmaterials and conditions should be obtained from ones employer,the manufacturer or supplierof that material,or the Material Safety Data Sheet.v
47、ii-,-,-INTENTIONALLY LEFT BLANKviii-,-,-ASME B16.20-2007METALLIC GASKETS FOR PIPE FLANGESRing-Joint,Spiral-Wound,and Jacketed1SCOPE1.1 GeneralThis Standard covers materials,dimensions,toler-ances,and markings for metal ring-joint gaskets,spiral-woundmetalgaskets,andmetal-jacketedgaskets.Thesegaskets
48、 are dimensionally suitable for use with flangesdescribed in reference flange standards ASME B16.5,ASME B16.47,API Specification 6A,and ISO 10423.ThisStandard covers spiral-wound metal gaskets and metal-jacketed gaskets for use with raised-face and flat-faceflanges.1.2 Quality SystemsRequirements re
49、lating to the product manufacturersquality system programs are described in Nonmanda-tory Appendix A.1.3 ReferencesStandards and specifications adopted by reference inthis Standard are shown in Mandatory Appendix II,which is part of this Standard.1.4 Relevant UnitsThis Standard states values in both
50、 metric and U.S.Customary units.These systems of units are to beregarded separately as standard.Within the text,the U.S.Customary units are shownin parentheses or in separate tables.The values statedin each system are not exact equivalents;therefore,it isrequired that each system of units be used in
