Metallic Gaskets for Pipe Flanges

Ring-Joint, Spiral-Wound, and Jacketed

AN A MERICAN NA TIONAL S T AND ARD

ASME B16.20-2012

(Revision of ASME B16.20-2007)

ASME B16.20-2012

(Revision of ASME B16.20-2007)

Metallic Gaskets for Pipe Flanges

Ring-Joint, Spiral-Wound, and Jacketed

AN AMERICAN NA TIONAL S T AND ARD

Two Park Avenue • New York, NY • 10016 USA

Date of Issuance: June 25, 2013

The next edition of this Standard is scheduled for publication in 2017.

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The American Society of Mechanical Engineers Two Park Avenue, New York, NY 10016-5990

Copyright © 2013 by

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

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CONTENTS

Foreword v

Committee Roster vi

Correspondence With the B16 Committee vii

Important Information Concerning Use of Asbestos or Alternative Materials viii

Summary of Changes xi

1. Scope 1

2. Ring-Joint Gaskets 1

3. Spiral-Wound Gaskets 2

4. Jacketed Gaskets 3

5. Grooved Metal Gaskets With Covering Layers 3

Figures

1. Spiral-Wound Gaskets (Metric) 5

2. Jacketed Gaskets (Metric) 5

3. Grooved Metal Gasket With Covering Layers 6

4. Illustration of Example Markings for Grooved Metal

Gasket With Covering Layers 7

Tables

1. Maximum Hardness for Ring Gaskets 1

2. Ring Gasket Markings 2

3. Type R Ring Gasket Dimensions and Tolerances 8

4. Pipe Sizes for Type R Ring Gaskets Suitable for Referenced Standards 11

5. Type RX Ring Gasket Dimensions and Tolerances 13

6. Pipe Sizes for Type RX Ring Gaskets Suitable for Referenced Standards 15

7. Type BX Ring Gasket Dimensions and Tolerances 16

8. Pipe Sizes for Type BX Ring Gaskets Suitable for Referenced Standards 17

9. Dimensions for Spiral-Wound Gaskets Used With ASME B16.5 Flanges 18

10. Dimensions for Spiral-Wound Gaskets Used With ASME B16.47 Series A Flanges 19

11. Dimensions for Spiral-Wound Gaskets Used With ASME B16.47 Series B Flanges 20

12. Inner-Ring Inside Diameters for Spiral-Wound Gaskets for Use With ASME B16.5

    Flanges 21

13. Inner-Ring Inside Diameters for Spiral-Wound Gaskets Used Between ASME

    B16.47 Series A Flanges 22

14. Inner-Ring Inside Diameters for Spiral-Wound Gaskets Used Between ASME

    B16.47 Series B Flanges 23

15. Minimum Pipe Wall Thickness Suitable for Use of Spiral-Wound Gaskets With

    Inner Rings for ASME B16.5 Flanges 24

16. Maximum Bore of ASME B16.5 Flanges for Use With Spiral-Wound Gaskets 25

17. Maximum Bore of ASME B16.47 Series A Flanges for Use With

    Spiral-Wound Gaskets 26

18. Maximum Bore of ASME B16.47 Series B Flanges for Use With

    Spiral-Wound Gaskets 27

19. Color Coding and Abbreviations for Spiral-Wound Gasket Materials 28

20. Example Markings for Spiral-Wound Gaskets 29

21. Jacketed Gasket Dimensions for ASME B16.5 Flanges 30

22. Jacketed Gasket Dimensions for ASME B16.47 Series A Flanges 31

23. Jacketed Gasket Dimensions for ASME B16.47 Series B Flanges 32

    
    

    iii

24. Abbreviations for Identifying Materials for Jacketed Gaskets 33

25. Example Markings for Jacketed Gaskets 33

26. Dimensions for Grooved Metal Gaskets With Covering Layers Used With

    ASME B16.5 Flanges 34

27. Dimensions for Grooved Metal Gaskets With Covering Layers Used With

    ASME B16.47 Series A Flanges 35

28. Dimensions for Grooved Metal Gaskets With Covering Layers Used With

    ASME B16.47 Series B Flanges 36

29. Color Coding and Abbreviations for Grooved Metal Gaskets With Covering Layers Materials 37

30. Example Markings for Grooved Metal Gaskets With Covering Layers 38

    Mandatory Appendices

    1. Dimensions of Gaskets in U.S. Customary Units 39

    2. References 61

Nonmandatory Appendix

A Quality System Program 62

iv

FOREWORD

Ring-joint gaskets and grooves probably originated in the boiler field, where they were used in various forms for manhole covers, autoclaves, and other closures; however, it was in the oil industry (both in the production and refining of oil) that they received the greatest recognition and were developed into their present form. Their use expanded steadily as temperatures and pressures were increased in steam plants. Tests examining their application in flanges and valves were conducted as early as 1928.

In 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 was known as API Specification 6B, Ring-Joint Flanges. Following the acceptance of ring-joints for flanges and valves by API and the issuance of their standard, ASA B16e on Steel Pipe Flanges and Flanged Fittings was revised to include them, and the 1939 edition included standard dimensions for a full line of ring-joint flanges based on the API standard. Development work continued, and API formulated Standard 6E, Specification for Wellhead Equipment, which included ring-joints not covered in ASA B16e-1939.

In 1949, the American Standards Association (ASA), Sectional Committee B16, Subcommittee 3, Steel Flanges and Flanged Fittings, assembled the available information on ring-joint gaskets into a single standard. ASA approval was granted on April 30, 1952, with the designation ASA B16.20-1952.

An updated version was submitted, and ASA approval was granted on April 4, 1955, with the designation ASA B16.20-1955. Ring gaskets for Class 900 (900 lb at that time) in sizes NPS 26 through 36 were added, and ASA approval was granted on April 2, 1956. The standard was reviewed 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 Standards Institute (ANSI) on April 25, 1973, with the designation of an American National Standard.

API requested that ASME convert their gasket standard, API 601, into an ASME American National Standard. As a result of that request, the standard was expanded to include requirements for 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 included in ASME/ ANSI B16.5-1988, Pipe Flanges and Flanged Fittings, and ASME B16.47-1990, Large Diameter Steel Flanges.

The 1993 edition was approved by the B16 Standards Committee, and, following approval by ASME, approval by ANSI was given on January 22, 1993, with the designation ASME B16.20-1993. In the 1998 edition of ASME B16.20, reference standards were updated, a quality system program 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 G and the B16 Main Committee, ANSI approved this American National Standard on November 20, 1998. In 2007, the Standard adopted metric dimensions as an independent standard to the U.S.Customary units, and Mandatory Appendix I was added to cover dimensional tables in

U.S. Customary units.

In 2012, the Standard introduced minor revisions to the material requirements for spiral-wound gaskets, along with the tables and figures. A new chapter has been included for Grooved Metal Gaskets With Covering Layers, and Mandatory Appendix II has also been updated to ensure relevancy.

Following approval by B16 Subcommittee G, the Standards Committee, and ASME, ANSI approved this American National Standard on October 22, 2012.

v

ASME B16 COMMITTEE

Standardization of Valves, Flanges, Fittings, and Gaskets

(The following is the roster of the Committee at the time of approval of this Standard.)

STANDARDS COMMITTEE OFFICERS

W. B. Bedesem, Chair

G. A. Jolly, Vice Chair

C. E. O’Brien, Secretary

A. Appleton, Alloy Stainless Products Co., Inc.

R. W. Barnes, ANRIC Enterprises, Inc.

W. B. Bedesem, Consultant

STANDARDS COMMITTEE PERSONNEL

G. A. Jolly, Vogt Valves/Flowserve Corp.

M. Katcher, Haynes International

W. N. McLean, B&L Engineering

R. M. Bojarczuk, ExxonMobil Research & Engineering Co.

D. F. Buccicone, Elkhart Products Corp.

A. M. Cheta, Shell Exploration and Production Co.

M. A. Clark, NIBCO, Inc.

G. A. Cuccio, Capitol Manufacturing Co.

1. E. Davila, Crane Energy

2. R. Frikken, Becht Engineering Co.

R. P. Griffiths, U.S. Coast Guard

T. A. McMahon, Emerson Process Management

M. L. Nayyar, Consultant

C. E. O’Brien, The American Society of Mechanical Engineers

W. H. Patrick, Dow Chemical Co.

R. A. Schmidt, Canadoil

H. R. Sonderegger, Fluoroseal, Inc.

W. M. Stephan, Flexitallic LP

F. R. Volgstadt, Volgstadt & Associates, Inc.

D. A. Williams, Southern Co. Generation

1. F. Reid, Chair, VSP Technologies

2. J. Lain, Vice Chair, Exelon Nuclear

   SUBCOMMITTEE G — GASKETS FOR FLANGED JOINTS

   K. Guenther, Shell

   D. H. Monroe, Consultant

3. Huang, Secretary, The American Society of Mechanical Engineers

T. Allami, Advanced Sealing and Supply Company, Inc.

1. Baulch, Teadit

2. A. Benton, Consultant

R. M. Bojarczuk, ExxonMobil Research & Engineering Co.

D. R. Frikken, Becht Engineering Co.

C. B. Gillis, Samson Controls

R. T. Mueller, Consultant

P. S. Petrunich, Fluid Sealing Association

M. Pollock, Graftech International Holdings, Inc.

D. Reeves, Chevron

W. M. Stephan, Flexitallic LP

C. Yoder, Garlock Sealing Technologies

1. Kolb, Alternate, Lamons Gasket Co.

   
   

   vi

   
   

   CORRESPONDENCE WITH THE B16 COMMITTEE

   
   

   General. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. As such, users of this Standard may interact with the Committee by requesting interpretations, proposing revisions, and attending Committee meetings. Corre- spondence should be addressed to:

   Secretary, B16 Standards Committee

   The American Society of Mechanical Engineers Two Park Avenue

   New York, NY 10016-5990

   As an alternative, inquiries may be submitted via email to: SecretaryB16@asme.org.

   Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically.

   The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation.

   Interpretations. Upon request, the B16 Committee will render an interpretation of any require- ment of the Standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the B16 Standards Committee.

   The request for interpretation should be clear and unambiguous. It is further recommended that the inquirer submit his/her request 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 is being requested.

   Question: Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation. The inquirer may also include any plans or drawings that are necessary to explain the question; however, they should not contain proprietary names or information.

   Requests that are not in this format will be rewritten in this format by the Committee prior to being answered, which may inadvertently change the intent of the original request.

   ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available. Further, persons aggrieved by an interpretation 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, which are open to the public. Persons wishing to attend any meeting should contact the Secretary of

   the B16 Standards Committee.

   
   

   vii

   
   

   IMPORTANT INFORMATION CONCERNING USE OF ASBESTOS OR ALTERNATIVE MATERIALS

   
   

   Asbestos is referenced for use as a filler material in metallic gaskets. It has served as a universal sealing material, compatible with most fluid services. It has been of extreme usefulness in minimiz- ing fire hazards.

   Certain serious adverse health effects are associated with asbestos, among them the serious and often fatal diseases of lung cancer, asbestosis, and mesothelioma (a cancer of the chest and abdominal linings). The degree of exposure to asbestos varies with the product and the work practices 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, Anthophyllite, and Actinolite, 29 Code of Federal Regulations Section 1910.1001; the U.S. Environmental Protection Agency National Emission Standard for Asbestos, 40 Code of Federal Regulations Sections 61.140 through 61.156; and the proposed rule by the U.S. Environmental Protection Agency proposing labeling requirements and phased banning of asbestos products, published at 51 Federal Register 3738-3759 (January 29, 1986).

   There are currently in use and under development a number of substitute materials to replace asbestos in certain applications. Manufacturers and users are encouraged to develop and use effective substitute materials that can meet the specifications for, and operating requirements of, the equipment to which they would apply.

   Information concerning safety and health risks and proper precautions with respect to particular materials and conditions should be obtained from one’s employer, the manufacturer or supplier of that material, or the Material Safety Data Sheet.

   
   

   viii

   
   

   ASME B16.20-2012 SUMMARY OF CHANGES

   
   

   Following approval by the B16 Committee and ASME, and after public review, ASME B16.20-2012 was approved by the American National Standards Institute on October 22, 2012.

   ASME B16.20-2012 consists of editorial changes, revisions, and corrections identified by a margin note, (12), placed next to the affected area.

   
   

   Page 1	Location 1.1		Change Revised
   3	4.4		Revised in its entirety
   	5		Added
   5	Fig. 1		Added
   	Fig. 2		Added
   6	Fig. 3		Added
   7	Fig. 4		Added
   18	Table 9
   19	Table 10
   20	Table 11
   28	Table 19		Revised
   30	Table 21		General Note (b) added
   31	Table 22
   32	Table 23
   34	Table 26		Added
   35	Table 27		Added
   36	Table 28		Added
   37	Table 29		Added
   38	Table 30		Added
   39	Fig. I-1		Added
   40	Fig. I-2		Added
   47	Table I-4
   48	Table I-5
   49	Table I-6
   		ix

   1. General Note (b) revised

   2. Notes (1) and (2) transposed

   1. Illustration removed

   2. General Note (b) revised

   1. Illustration removed

   2. General Note (b) revised

   1. Illustration removed

   2. General Note (b) added

   1. Illustration removed

   2. General Note (b) added

   1. General Note (b) revised

   2. Notes (1) and (2) transposed

   1. Illustration removed

   2. General Note (b) revised

   1. Illustration removed

   2. General Note (b) revised

   
   

   Page 55	Location Table I-12	Change (1) Illustration removed
   		(2) General Note (b) added
   56	Table I-13
   57	Table I-14
   58	Table I-15	Added
   59	Table I-16	Added
   60	Table I-17	Added
   61	Mandatory Appendix II	Updated

   1. Illustration removed

   2. General Note (b) added

   1. Illustration removed

   2. General Note (b) added

   
   

   x

   ASME B16.20-2012