1、AN AMERICAN NATIONAL STANDARD ASME B16.21-2016 (Revision of ASME B16.21-2011) Nonmetallic Flat Gaskets for Pipe FlangesASME B16.21-2016 (Revision of ASME B16.21-2011) Nonmetallic Flat Gaskets for Pipe Flanges AN AMERICAN NATIONAL STANDARD xDate of Issuance: December 9, 2016 The next edition of this
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11、e prior writ ten permission of the publisher . The American Society of Mechanical Engineers Two Park Avenue, New York, NY 10016-5990 Copyright 2016 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A.CONTENTS Foreword . . . . . . . . . . . . . . . . . . . . . . . . .
12、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi Correspondence With the B16 Committee . . . . . . .
13、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix List of Changes in Record Number Order . . . . . . . . . . .
14、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x 1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、. . . . . . . . . . . . . 1 5 Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Mandatory Appendices I Dimensions of Gaskets in U.S. Customary Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17、. . . . 8 II References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Nonmandatory Appendices A Quality System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、. . . 14 B References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Tables 1 Gasket Dimensions for ASME B16.1 Class 25, Cast Iron Pipe Flanges and Flanged Fittings . . . . . 3 2 Gasket Dimensions for ASME B16.1 Class 12
19、5, Cast Iron Pipe Flanges and Flanged Fittings . . . . 3 3 Flat Ring Gasket Dimensions for ASME B16.1 Class 250, Cast Iron Pipe Flanges and Flanged Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 Gasket Dimens
20、ions for ASME B16.5 Class 150, Pipe Flanges and Flanged Fittings . . . . . . . . . . . 4 5 Flat Ring Gasket Dimensions for ASME B16.5, Pipe Flanges and Flanged Fittings, Classes 300, 400, 600, and 900 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、 . . . . . . . . . . . . 5 6 Full Face Gasket Dimensions for ASME B16.24, Cast Copper Alloy Pipe Flanges and Flanged Fittings, Classes 150 and 300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 7 Flat Ring Gasket Dimensions for ASME B16.47
22、 Series A, Large Diameter Steel Flanges, Classes 150, 300, 400, and 600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 8 Flat Ring Gasket Dimensions for ASME B16.47 Series B, Large Diameter Steel Flanges, Classes 75, 150, 300,
23、400, and 600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 9 Full Face Gasket Dimensions for MSS SP-51 Class 150LW, Corrosion-Resistant Cast Flanges and Flanged Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. . . . . . . . . . . . . . . . . . . . . . . . . 7 I-1 Gasket Dimensions for ASME B16.1 Class 25, Cast Iron Pipe Flanges and Flanged Fittings . . . . . 8 I-2 Gasket Dimensions for ASME B16.1 Class 125, Cast Iron Pipe Flanges and Flanged Fittings . . . . 9 I-3 Flat Ring Gasket Dimensions for ASME B1
25、6.1 Class 250, Cast Iron Pipe Flanges and Flanged Fittings 9 I-4 Gasket Dimensions for ASME B16.5 Class 150, Pipe Flanges and Flanged Fittings . . . . . . . . . . . 10 iiiI-5 Flat Ring Gasket Dimensions for ASME B16.5, Pipe Flanges and Flanged Fittings, Classes 300, 400, 600, and 900 . . . . . . . .
26、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 I-6 Full Face Gasket Dimensions for ASME B16.24, Cast Copper Alloy Pipe Flanges and Flanged Fittings, Classes 150 and 300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、. . . . . . . . . . . . . . . . . . . . 11 I-7 Flat Ring Gasket Dimensions for ASME B16.47 Series A, Large Diameter Steel Flanges, Classes 150, 300, 400, and 600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 I-8 Flat Ring Gas
28、ket Dimensions for ASME B16.47 Series B, Large Diameter Steel Flanges, Classes 75, 150, 300, 400, and 600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 I-9 Full Face Gasket Dimensions for MSS SP-51 Class 150LW, Corrosion-Resistant Ca
29、st Flanges and Flanged Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 ivFOREWORD Before this Standard was issued, the individual sizes of gaskets were made to many different sets of dimensions, based on different concepts
30、 of adaptation and functional use on the part of consumers as well as manufacturers. In some cases, dimensions were shown in American Standards. To standardize gasket sizes, the Standards and Specifications Committee of the Mechanical Packing Association (MPA) started work on a standard for nonmetal
31、lic or cut gaskets for bronze, iron, and steel pipe flanges. Dimensions of gaskets being used were collected, and a basic design philosophy for sizing was formulated by the Committee. This was the result of extensive field research experience and accepted standard user requirements. The procedure th
32、at followed was to dimension the gasket for each type and size of flange so as to prevent the gasket from projecting into the line of flow. Dimensional tolerances of standard pipe flanges and fittings as to I.D., O.D., and bolting were all considered. Suggested dimensional standards were tabulated a
33、nd distributed for industry comment. After several revisions, a final draft, dated September 15, 1948, was approved by the MPA for submission as an American Standard. Sectional Committee (B16) on the Standardization of Pipe Flanges and Fittings was organized in 1921 under the procedure of the Americ
34、an Standards Association (ASA), with the Heating, Piping, and Air Conditioning Contractors National Association now Mechanical Contractors Association of America (MCAA), Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), and The American Society of Mechanical Engineers (
35、ASME) as joint sponsors. Sectional Committee B16 received the proposal on May 9, 1949, and assigned it to a joint group of Subcommittees 1 and 3. The MSS was also consulted as the proposal included gaskets for bronze flanges made to their Standard Practice SP-2. This joint group offered a revision o
36、f the original design concept for sizing, which was acceptable to the MPAs Committee now the Fluid Sealing Association (FSA). The Standard was approved as an American Standard on December 5, 1951, with the designation ASA B16.21-1951. In 1961, the Standard was reviewed by the members of Subcommittee
37、 No. 7 on Gaskets and proposals for revision and updating the Standard were agreed upon. The ASA granted approval of the revision on March 20, 1962. In the mid-1960s, work had begun on a revision. The revision became a complete rewrite and included gaskets for API Std 605, MSS SP-44 and SP-51, as we
38、ll as complete metric equivalents for all dimensions. The American National Standards Institute (ANSI) approved the revised standard as an American National Standard on May 2, 1978. In 1982, American National Standards Committee B16 was reorganized as an ASME Committee operating under procedures acc
39、redited by ANSI. In 1989, general revisions had begun to reflect the current size ranges covered by the corresponding flange standard. Gasket dimensions for tongue and groove, male and female rating classes above 900 were deleted because a survey indicated these nonmetallic gaskets were almost never
40、 used for these joints. Tolerances to the dimensions were added. ANSI approved the edition as an American National Standard, with the new designation ASME B16.21-1992, on March 16, 1992. In 2005, the Standard adopted metric (SI) dimensions. ANSI approved this American National Standard on March 16,
41、2005. The 2011 edition included revisions to paragraph numbering and adjustments of appendices. ANSI approved it as an American National Standard on January 13, 2011. In this 2016 edition, Table 9 was expanded to include values greater than NPS 12. The ASME B16 Standards Committee operates under pro
42、cedures accredited by ANSI. Following approval by the ASME B16 Standards Committee, ANSI approved this edition as an American National Standard, with the designation ASME B16.21-2016, on October 11, 2016. vASME B16 COMMITTEE Standardization of Valves, Flanges, Fittings, and Gaskets (The following is
43、 the roster of the Committee at the time of approval of this Standard.) STANDARDS COMMITTEE OFFICERS R. A. Bojarczuk, Chair C. Davila, Vice Chair C. Ramcharran, Secretary STANDARDS COMMITTEE PERSONNEL A. Appleton, Alloy Stainless Products Co., Inc. J. E. Barker, Dezurik Water Controls R. W. Barnes,
44、Anric Enterprises, Inc. P. Milankov, Alternate, Anric Enterprises, Inc. K. Barron, Ward Manufacturing D. C. Bayreuther, Metso Automation, Flow Control Division W. B. Bedesem, Consultant R. A. Bojarczuk, ExxonMobil Research and Engineering Co. A. M. Cheta, Shell Exploration and Production Co. M. A. C
45、lark, NIBCO, Inc. G. A. Cuccio, Capitol Manufacturing Co. J. D Avanzo, Fluoroseal Valves C. Davila, Crane Energy D. R. Frikken, Becht Engineering Co. R. B. Hai, RBH Associates G. A. Jolly, Consultant M. Katcher, Haynes International T. A. McMahon, Emerson Process Management M. L. Nayyar, NICE W. H. Patrick, The Dow Chemical Co. D. Rahoi, Consultant C. Ramcharran, The American Society of Mechanical Engineers R. A. Schmidt, Canadoil J. Tucker, Flowserve F. R. Volgstadt, Volgstadt however, they should not contain proprietary names or information. vii
