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ASME B16.20-2017(Revision of ASME B16.20-2012)Metallic Gasketsfor Pipe FlangesA N A M E R I C A N N AT I O N A L STA N DA R D
ASME B16.20-2017(Revision of ASME B16.20-2012)Metallic Gasketsfor Pipe FlangesAN AMERICAN NATIONAL STANDARDx
Date of Issuance: December 29, 2017The next edition of this Standard is scheduled for publication in 2022.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard. Periodically certainactions of the ASME B16 Committee may be published as Cases. Cases and interpretations are published on the ASME Web siteunder the Committee Pages at http://cstools.asme.org/ as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages to provide corrections toincorrectly published items, or to correct typographical or grammatical errors in codes and standards. Such errata shall be usedon the date posted.The Committee Pages can be found at http://cstools.asme.org/. There is an option available to automatically receive an e-mailnotification when errata are posted to a particular code or standard. This option can be found on the appropriate CommitteePage after selecting “Errata” in the “Publication Information” section.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 National Standards. The StandardsCommittee that approved the code or standard was 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 review and comment that provides an opportunityfor 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 with any items mentioned in thisdocument, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, norassume any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and therisk of infringement of such rights, is entirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industryendorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME proceduresand 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 EngineersTwo Park Avenue, New York, NY 10016-5990Copyright 2017 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.
CONTENTSForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vCommittee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viCorrespondence With the B16 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viiImportant Information Concerning Use of Asbestos or Alternative Materials . . . . . . . . . . . . . . . . . . . . . . . .ixSummary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xList of Changes in Record Number Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiPART GRGR-1GR-2GR-3GR-4PART RJRJ-1RJ-2RJ-3RJ-4General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Quality Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Relevant Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ring-Joint Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1111122222RJ-5RJ-6RJ-7PART SWSW-1SW-2SW-3SW-4PART JAJA-1JA-2JA-3JA-4JA-5PART GMDimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Surface Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Identification Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Spiral-Wound Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Size and Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Jacketed Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Size and Pressure Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Grooved Metal Gaskets With Covering Layers . . . . . . . . . . . . . . . . . . . . . . . .222151515161633333333333339GM-1GM-2GM-3GM-4Size and Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39393939Mandatory AppendixIReferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48iii
Nonmandatory AppendixAQuality System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . aximum Hardness for Ring Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ring Gasket Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Type R Ring Gasket Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pipe Sizes for Type R Ring Gaskets Suitable for Referenced Standards . . . . . . . . . . . . . . .Type RX Ring Gasket Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pipe Sizes for Type RX Ring Gaskets Suitable for Referenced Standards . . . . . . . . . . . . . .Type BX Ring Gasket Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pipe Sizes for Type BX Ring Gaskets Suitable for Referenced Standards . . . . . . . . . . . . . .Dimensions for Spiral-Wound Gaskets Used With ASME B16.5 Flanges . . . . . . . . . . . . . . .Dimensions for Spiral-Wound Gaskets Used With ASME B16.47 Series A Flanges . . . . . . . .Dimensions for Spiral-Wound Gaskets Used With ASME B16.47 Series B Flanges . . . . . . . .Inside Diameters of Inner Rings for Spiral-Wound Gaskets for Use With ASME B16.5 FlangesInside Diameters of Inner Rings for Spiral-Wound Gaskets Used Between ASME B16.47 Series AFlanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inside Diameters of Inner Rings for Spiral-Wound Gaskets Used Between ASME B16.47 Series BFlanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Minimum Pipe Wall Thickness Suitable for Use of Spiral-Wound Gaskets With Inner Rings forASME B16.5 Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Maximum Bore of ASME B16.5 Flanges for Use With Spiral-Wound Gaskets . . . . . . . . . . .Maximum Bore of ASME B16.47 Series A Flanges for Use With Spiral-Wound Gaskets . . . .Maximum Bore of ASME B16.47 Series B Flanges for Use With Spiral-Wound Gaskets . . . .Color Coding and Abbreviations for Spiral-Wound Gasket Materials . . . . . . . . . . . . . . . . .Example Markings for Spiral-Wound Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Jacketed Gasket Dimensions for ASME B16.5 Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . .Jacketed Gasket Dimensions for ASME B16.47 Series A Flanges . . . . . . . . . . . . . . . . . . . .Jacketed Gasket Dimensions for ASME B16.47 Series B Flanges . . . . . . . . . . . . . . . . . . . .Abbreviations for Identifying Materials for Jacketed Gaskets . . . . . . . . . . . . . . . . . . . . . . .Example Markings for Jacketed Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Dimensions for Grooved Metal Gaskets With Covering Layers Used With ASME B16.5 FlangesDimensions for Grooved Metal Gaskets With Covering Layers Used With ASME B16.47 Series AFlanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Dimensions for Grooved Metal Gaskets With Covering Layers Used With ASME B16.47 Series BFlanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Color Coding and Abbreviations for Grooved Metal Gaskets With Covering Layers MaterialsExample Markings for Grooved Metal Gaskets With Covering Layers . . . . . . . . . . . . . . . . Wound Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Jacketed Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Grooved Metal Gasket With Covering Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Illustration of Example Markings for Grooved Metal Gaskets With Covering Layers . . . . .iv252627282930313235363738384142444647
ASME B16.20-2017 (Revision of ASME B16.20-2012) Metallic Gaskets for Pipe Flanges AN AMERICAN NATIONAL STANDARD x. Date of Issuance: December 29, 2017 The next edition of this Standard is scheduled for publication in 2022. ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard. Periodically certain actions of the ASME B16 Committee may be .
