1、AN AMERICAN NATIONAL STANDARDNonmetallic Flat Gaskets forPipe FlangesASME B16.21-2005(Revision of ASME B16.21-1992)Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16.21-2005(Revision of ASME
2、B16.21-1992)Nonmetallic FlatGaskets for Pipe FlangesThree Park Avenue New York, NY 10016AN AMERICAN NATIONAL STANDARDCopyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Date of Issuance: May 31, 2005AS
3、ME 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 National Stan-dards. The Standards Committee that approved the code or standard was balanced to assure that individuals
4、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 opportunity for additional public input from industry, academia,regulatory agencies, and the public-at-large.ASME does not
5、“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 any itemsmentioned in this document, and does not undertake to insure anyone utilizing a standard agai
6、nst 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 patent rights, and the risk of infringement of such rights, is entirely theirown responsibility.Participati
7、on by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as gov-ernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures a
8、nd 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 EngineersThree Park Avenue, New Y
9、ork, 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 addenda issuedto this edition.ASME issues written replies to inquiries concerning interpretation
10、s 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.Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without lice
11、nse from IHS-,-,-CONTENTSForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ivCommittee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vCorr
12、espondence With the B16 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Types and Sizes . . . . . . . . . . . . . . . . . .
13、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14、 . . . . . . . . . . . . . . . . . 15 Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Tables1 Gasket Dimensions for ASME B16.1 Class 25, Cast Iron Pipe Flanges and Flanged Fittings . . . . . . . . . . . . . . . . . .
15、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Gasket Dimensions for ASME B16.1 Class 125, Cast Iron Pipe Flanges and Flanged Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Flat Ring Gasket Dimensions f
16、or ASME B16.1 Class 250, Cast Iron Pipe Flanges and Flanged Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Gasket Dimensions for ASME B16.5 Class 150, Pipe Flanges and Flanged Fittings . . . 45 Flat Ring Gasket Dimensions for ASME B16.
17、5 Pipe Flanges and Flanged Fittings, Classes 300, 400, 600, and 900 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Full Face Gasket Dimensions for ASME B16.24, Cast Copper Alloy Pipe Flanges and Flanged Fittings, Classes 150 and 300 . . . . . . . . . . . . .
18、 . . . . . . . . . . . . . . . . . . . . 57 Flat Ring Gasket Dimensions for ASME B16.47 Series A, Large Diameter Steel Flanges, Classes 150, 300, 400, and 600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Flat Ring Gasket Dimensions for ASME B16.47 Series B, Large Diamet
19、er Steel Flanges, Classes 75, 150, 300, 400, and 600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Full Face Gasket Dimensions for MSS SP-51 Class 150LW, Corrosion-Resistant Cast Flanges and Flanged Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . 6Mandatory AppendicesI Dimensions of Gaskets in U.S. Customary Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7II References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Nonmandatory AppendixAQua
21、lity System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13iiiCopyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FOREWORDBefore this standard
22、 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 Stan
23、dards and Specifications Committee of the Mechani-cal Packing Association started work on a standard for nonmetallic or cut gaskets for bronze,iron, and steel pipe flanges. Dimensions of gaskets being used were collected, and a basic design philosophy for sizing wasformulated by the committee. This
24、was the result of extensive field research experience and ac-cepted standard user requirements. The procedure followed was to dimension the gasket for eachtype and size of flange so as to prevent the gasket from projecting into the line of flow. Dimen-sional tolerances of standard pipe flanges and f
25、ittings as to I.D., O.D., and bolting were all con-sidered.Suggested dimensional standards were tabulated and distributed for industry comment. Afterseveral revisions, a final draft, dated September 15, 1948, was approved by the Mechanical Pack-ing Association for submission as an American Standard.
26、Sectional Committee (B16) on the Standardization of Pipe Flanges and Fittings was organizedin 1921 under the procedure of the American Standards Association, with the Heating, Piping,and Air Conditioning Contractors National Association, Manufacturers Standardization Societyof the Valve and Fittings
27、 Industry, and the American Society of Mechanical Engineers as jointsponsors.Sectional Committee B16 received the proposal on May 9, 1949, and assigned it to a joint groupof Subcommittees 1 and 3. The Manufacturers Standardization Society was also consulted as theproposal included gaskets for bronze
28、 flanges made to their Standard Practice SP-2. This joint groupoffered a revision of the original design concept for sizing, which was acceptable to the Mechani-cal Packing Associations Committee (now the Fluid Sealing Association). The Standard was ap-proved as an American Standard on December 5, 1
29、951, with the designation ASA B16.21-1951.In 1961, the Standard was reviewed by the members of Subcommittee No. 7 on Gaskets andproposals for revision and updating the Standard were agreed upon. The American StandardsAssociation granted approval of the revision on March 20, 1962 following sectional
30、committeeand sponsor approval.In the mid-1960s, work had begun on a revision. The revision became a complete rewrite andincluded gaskets for API Std 605, MSS SP-44 and SP-51, as well as complete metric equivalentsfor all dimensions. Following its approval by the B16 Standards Committee and Co-Secret
31、ariatorganizations, this Standard was approved as an American National Standard by ANSI on May2, 1978.In 1982, American National Standards Committee B16 was reorganized as an ASME Commit-tee operating under procedures accredited by ANSI.In 1989, general revisions had begun to reflect the current siz
32、e ranges covered by the corre-sponding flange standard. Gasket dimensions for tongue and groove, male and female RatingClasses above 900 were deleted because a survey indicated these nonmetallic gaskets were al-most never used for these joints. Tolerances to the dimensions were added.Following appro
33、val by the Standards Committee and ASME, approval as an American Na-tional Standard was given by ANSI on March 16, 1992, with the new designation ASME B16.21-1992.In 2005, the Standard adopted metric (SI) dimensions. Following approval by the B16 Sub-committee G, the B16 Standards Committee, and ASM
34、E, ANSI approved this American NationalStandard on March 16, 2005.All requests for interpretation or suggestions for revisions should be sent to the Administra-tive Secretary B16, The American Society of Mechanical Engineers, Three Park Avenue, New York,NY 10016-5990.ivCopyright ASME International P
35、rovided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16 COMMITTEEStandardization of Valves, Flanges, Fittings, and Gaskets(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERSH. R. So
36、nderegger, ChairM. L. Nayyar, Vice ChairP. A. Reddington, SecretaryCOMMITTEE PERSONNELR. W. Barnes, Anric Enterprises, Inc. W. N. McLean, Newco ValvesW. B. Bedesem, Exxon Mobil Research however, theyshould not contain proprietary names or information.Requests that are not in this format will be rewr
37、itten in this format by the Committee prior tobeing answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additional in-formation that might affect an interpretation is available. Further, persons aggr
38、ieved by an in-terpretation 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. The B16 Standards Committee regularly holds meetings, whichare open to
39、 the public. Persons wishing to attend any meeting should contact the Secretary of theB16 Standards Committee.viCopyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NONMETALLIC FLAT GASKETS FOR PIPE FLA
40、NGES1 SCOPE1.1 GeneralThis Standard covers types, sizes, materials, dimen-sions, tolerances, and markings for nonmetallic flat gas-kets. These gaskets are dimensionally suitable for usewith flanges described in the referenced flange standards.1.2 Relevant UnitsThis Standard states values both in met
41、ric and U.S.customary units. As an exception, diameter of bolts andflange bolt holes are expressed in inch units only. Thesesystems of units are to be regarded separately as stan-dard. Within the text, the U.S. customary units areshown in parentheses or in separate tables. The valuesstated in each s
42、ystem are not exact equivalents; there-fore, it is required that each system of units be used in-dependently of the other. Except for diameter of boltsand flange bolt holes, combining values from the twosystems constitutes nonconformance with the Standard.1.3 Quality SystemsRequirements relating to
43、the product manufacturersquality system programs are described in Nonmanda-tory Appendix A.1.4 ReferencesStandards and specifications adopted by reference inthis Standard are shown in Mandatory Appendix II.2 TYPES AND SIZES2.1 TypesDimensions are provided for the following types ofgaskets, which are
44、 suitable for use with the flange facesindicated:Gasket Type Flange FacingFull face Flat faceFlat ring Raised face2.2 SizeNPS, followed by a dimensionless number, is the des-ignation for normal pipe size, NPS, as described inASME B16.21-20051ASME B36.10M; and is related to the reference nominaldiame
45、ter, DN, used in international standards. The re-lationship is as follows:NPS DN1/2153/42012511/43211/24025021/2653831/2904 100GENERAL NOTE: For NPS H11350 4, the related DN is DN H11005 25 H11003NPS2.3 Pressure Class DesignationClass, followed by a dimensionless number, is thedesignation for common
46、 flange pressure-temperatureratings as given by the referenced flange standards.3 MATERIALS3.1 CompositionGaskets shall be made of resilient or pliable materi-als. Metal or nonmetal composites may be incorporatedas reinforcement or filler material.3.2 Service RequirementsSelection of a material suit
47、able for a given service ap-plication is the responsibility of the user subject to therequirements of any applicable code or government reg-ulation. The material selected shall be compatible withthe fluid and suitable for the pressure-temperature con-ditions of the service.4 DIMENSIONS AND TOLERANCE
48、S4.1 DimensionsGasket dimensions shall be in accordance with Tables1 through 9 (Tables I-1 through I-9 of Appendix I) forthe flanges standards, sizes, and classes indicated. Se-lection of gasket thickness is the responsibility of theCopyright ASME International Provided by IHS under license with ASM
49、ENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-user, considering the properties of the gasket materialas well as the intended service application.4.2 Tolerances(a) Outside Diameter(1) NPS 12 and smaller: H110010.0, H110021.5 mm (H110010.0, H110020.06 in.)(2) NPS 14 and larger: H110010.0, H110023.0 mm (H110010.0, H110020.12 in.)(b) Inside Diameter(1) NPS 12 and smaller: H110061.5 mm (H110060.06 in
