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STDOASME BLb-ZOA-ENGL 2000 0757b70 ObL7b7b T37

AN AMERICAN NATIONAL STANDARD

ASME B1 6.20a-2000

ADDENDA

to

ASME B16.20-1998 METALLIC GASKETS FOR PIPE FLANGES Ring-Joint, Spiral-Wound, and Jacketed

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

Three Park Avenue New York, NY 10016

COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services

STD-ASME B L b - 2 0 A - E N G L 2000 H 0757b70 ObL7b77 773 0

Date of Issuance: July 21, 2000

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 Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large.

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

Copyright O 2000 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

All Rights Reserved Printed in U.S.A.


STD-ASME BLb.20A-ENGL 2000 m 0759b70 ObL7b78 BOT m

ASME B1 6.20a-2000

Following approval by the ASME B16 Committee and ASME, and after public review, ASME B 16.20a- 2000 was approved by the American National Standards Institute on May 3, 2000.

Addenda to the 1998 edition of ASME B 16.20 are issued in the form of replacement pages. Revisions, additions, and deletions are incorporated directly into the affected pages. It is advisable, however, that this page, the Addenda title and copyright pages, and all replaced pages be retained for reference.

SUMMARY OF CHANGES

This is the first Addenda to be published to ASME B16.20-1998.

Replace or insert the pages listed. Changes given below are identified on the pages by a margin note, (a), placed next to the affected area. The pages not listed are the reverse sides of the listed pages and contain no changes.

Page Location Change

V Committee Roster Updated to reflect Addenda

xi Contents Updated to reflect Addenda

2, 2.1 Paragraph 3.2.5 Revised

21 Table 12 Notes ( 1 ) and ( 3 ) revised

23

24

Table 14

Table 15

General Note (c) and Notes ( I ) and ( 2 ) revised

( I ) Title revised (2) General Notes added

28 Table 19 Revised

35 Mandatory Annex I Revised


ASME B16 COMMITTEE Standardization of Valves, Flanges, Fittings, Gaskets,

and Valve Actuators

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

OFFICERS

W. N. McLean, Chair H. R. Sonderegger, Vice Chair P. A. Reddington, Secretary

COMMllTEE PERSONNEL

W. L. Ballis, Consultant, London, Ohio R. W. Barnes, Anric Enterprises, Etobicoke, Ontario, Canada R. R. Brodin, Fisher Controls International, Inc., Marshalltown, Iowa M. A. Clark, Nibco, Inc., Elkhart, Indiana A. Cohen, A. Cohen and Associates, Albuquerque, New Mexico C. E. Floren, Mueller Co., Decatur. Illinois D. R. Frikken, Solutia. Inc., St. Louis, Missouri R. Henrich, Minnegasco, Inc., Golden Valley, Minnesota J. C. Inch, Mueller Refrigeration Products Co., Hartsville, Tennessee G. A. Jolly, Vogt Valve Co., Louisville, Kentucky W. G. Knecht, BW/IP International, Inc., Williamsport, Pennsylvania R. Koester, The William Powell Co., Cincinnati, Ohio W. N. McLean, Newco Valves, Palos Park, Illinois M. L. Nayyar, Bechtel Power Corp., Gaithersburg, Maryland P. A. Reddington, American Society of Mechanical Engineers, New York, New York R. A. Schmidt, Trinity-Ladish Co., Russellville, Arkansas H. R. Sonderegger, Grinnell Corp., Cranston, Rhode Island W. M. Stephan, Flexitallic, Inc., Mount Laurel, New Jersey T. F. Stroud, Ductile Iron Pipe Research Association, Birmingham, Alabama M. D. Wasicek, ABS Americas, Houston, Texas R. E. White, Richard E. White and Associates, South Bend, Indiana D. A. Williams, Southern Company Services, Birmingham, Alabama L. A. Willis, The Dow Chemical Co., Freeport, Texas W. R. Worley, Union Carbide Corp.. South Charleston, West Virginia

SUBCOMMITTEE G - GASKETS FOR FLANGED JOINTS

W. M. Stephan, Chair, Flexitallic, Inc., Mount Laurel, New Jersey C. B. Gillis, Vice Chair, Lamons Gasket Co., Houston, Texas M. R. Argenziano, Secretary, American Society of Mechanical Engineers, New York, New York K. A. Benton, Leader Gasket, Inc., Houston, Texas W. E. Holden, Solutia, Inc., Alvin, Texas D. H. Monroe, Consultant, Birmingham, Alabama R. T. Mueller, ExxonMobil Research and Engineering Co., Florham Park, New Jersey D. F. Reid, Garlock Metallic Gasket Division, Houston, Texas J. Tzeng, Ucar Carbon Co., Inc., Parma, Ohio W. R. Worley, Union Carbide Corp., South Charleston, West Virginia

V


CONTENTS

... Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III

Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v Correspondence With the B 16 Committee .................................................... vii Important Information Concerning Use of Asbestos or Alternative Materials ..................... ix

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Ring-Joint Gaskets ................................................................. 1

3 Spiral-Wound Gaskets .............................................................. 2

4 Jacketed Gaskets ................................................................... 3

Tables I Maximum Hardness for Ring Gaskets .................................................. 2 Ring Gasket Markings ................................................................ 3 Type R Ring Gasket Dimensions and Tolerances .......................................

5 Type RX Ring Gasket Dimensions and Tolerances .....................................

7 Type BX Ring Gasket Dimensions and Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

8 Pipe Sizes for Type BX Ring Gaskets Suitable for Referenced Standards . . . . . . . . . . . . . . . . 9 Dimensions for Spiral-Wound Gaskets Used With ASME B16.5 Flanges .................

I O Dimensions for Spiral-Wound Gaskets Used With ASME B16.47 Series A Flanges ...... 1 1 Dimensions for Spiral-Wound Gaskets Used With ASME B 16.47 Series B Flanges . . . . . . . 12 Inner-Ring Inside Diameters for Spiral-Wound Gaskets .................................. 13 Inner-Ring Inside Diameters for Spiral-Wound Gaskets Used Between ASME

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

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

B16.47 Series A Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B 16.47 Series B Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inner Rings for ASME B 16.5 Flanges ............................................... 16 Maximum Bore of ASME 816.5 Flanges for Use With Spiral-Wound Gaskets . . . . . . . . . . . 17 Maximum Bore of ASME B 16.47 Series A Flanges for Use With

18 Maximum Bore of ASME B 16.47 Series B Flanges for Use With

19 Color Coding and Abbreviations for Spiral-Wound Gasket Materials ..................... 20 Example Markings for Spiral-Wound Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Jacketed Gasket Dimensions for ASME B16.5 Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Jacketed Gasket Dimensions for ASME B16.47 Series A Flanges ....................... 23 Jacketed Gasket Dimensions for ASME B16.47 Series B Flanges ....................... 24 Abbreviations for Identifying Materials for Jacketed Gaskets ............................ 25 Example Markings for Jacketed Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spiral-Wound Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spiral-Wound Gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 2 4 7

10 12 13 14 16 18 20 21

22

23

24 25

26

27 28 29 30 31 32 33 33

xi


STD-ASME BLb.20A-ENGL 2000 S 0757b70 Ob L 7 b B L 3 T q I

Mandatory Annex I References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Nonmandatory Annex A Quality System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37


STDOASME BIb.20A-ENGL 2000 I 0757b70 ObL7b82 230 I

ASME B16.20a-2000

METALLIC GASKETS FOR PIPE FLANGES

Ring-Joint, Spiral-Wound, and Jacketed

1 SCOPE

1.1 General

This Standard covers materials, dimensions, tolerances, and markings for metal ring-joint gaskets, spiral- wound metal gaskets, metal-jacketed gaskets, and filler material. These gaskets are dimensionally suitable for use with flanges described in reference flange standards ASME B 16.5, ASME 816.47, and API Specification 6A. This Standard covers spiral-wound metal gaskets and metal-jacketed gaskets for use with raised-face and flat-face flanges.

1.2 Quality Systems

Requirements relating to the product manufacturers' quality system programs are described in Annex A.

1.3 References

Standards and specifications adopted by reference in this Standard are shown in Annex I , which is part of this Standard.

2 RING-JOINT GASKETS

2.1 Types

Ring-joint gaskets shall be either octagonal or oval in cross section.

2.2 Size

Ring-joint gaskets shall be identified by an R, RX, or BX number that relates to flange size (NPS), pressure class, and the appropriate flange standards (ASME B 16.5, ASME B 16.47, or API Specification 6A).

2.3 Materials

2.3.1 General. Ring-joint gasket materials, some of which are listed in Table 1 , shall be selected by the user based on suitability for the service conditions.

TABLE 1 MAXIMUM HARDNESS FOR RING GASKETS

Maximum Hardness

Ring Gasket Material Brinell Rockwell "B" Scale

Soft iron (1) 90 56 Low-carbon steel 120 68 4-6 chrome ' /2M~ 130 72 Type 410 170 86 Type 304 160 83 Type 316 160 83 Type 347 160 83

NOTE: (1) May be low-carbon steel, not to exceed max imum

hardness of 90 Brinell-56 Rockwell "B."

It is recommended that ring-joint gaskets be of a lesser hardness than that of the mating flanges.

2.3.2 Hardness. Ring-joint gaskets of materials listed in Table I shall have a hardness equal to or less than that shown in Table I .

2.4 Marking

The outer surface of each gasket shall carry the manufacturer's name or identification trademark and gasket number prefixed by the letters R, RX, or BX followed by the gasket material identification. Materials shall be identified as shown in Table 2. The gasket shall also be marked with an ASME B 16.20 designation. The marking shall be applied so as not to harmfully distort the gasket or affect the integrity of the seal.

2.5 Dimensions and Tolerances

Dimensions and tolerances for ring-joint gaskets shall be as shown in Tables 3 through 8.

2.6 Surface Finish

Types R and RX gaskets shall have a finish not rougher than 63 p i n . roughness. Type BX gaskets shall have a finish not rougher than 32 pin. roughness. Surface finishes shall pertain to the gasket-sealing surfaces.

I


STD-ASME B L b - Z O A - E N G L 2000 I 0757b70 ObL7b81 L77

ASME B16.20a-2000

TABLE 2 RING GASKET MARKINGS

Ring Gasket Material Identification Marking Example (1)

Soft iron 12) D R51D Low-carbon steel S R51S 4-6 chrome Y2Mo F5 (3) R51F5 Type 410 S 410 R51S410 Type 304 S 304 R51 S304 Type 3 16 S 316 R51S316 Type 347 S 347 R51S347

NOTES: (1 ) This n u m b e r shall he preceded by t h e manufacturer's

( 2 ) M a y be low-carbon steel, not to exceed m a x i m u m

(3) F5 identification designates ASTM Specification A 182-

name or identification trademark.


72 chemical composition requirements only.

2.7 Identification Number

Dimensional reference identification numbers are as- signed to ring-joint gaskets and are shown in Tables 3 through 8.

3 SPIRAL-WOUND GASKETS

3.1 Size and Class

Spiral-wound gaskets, including centering ring and inner ring (paras. 3.2.4 and 3 . 2 5 ) . are identified by flange size (NPS), pressure class. and the appropriate flange standard (ASME B 16.5 or ASME B 16.37).


3.2.1 General. Dimensions and tolerances for spiral-wound gaskets, centering rings, and inner rings shall be i n accordance with Tables 9 thr-ough I I and as specified i n this section.

3.2.2 Construction. Spiral-wound gaskets shall be constructed as alternate plies (circular layers counted as revolutions) of preformed metal windings and plaint fillers that are spirally wound. For the finished gasket, the filler shall be essentially flush with. but not below, the metal winding on both contact faces of the gasket. The metal strip i n the winding shall be 0.006 in. to 0.009 in . thick. The filler matet-ia1 thickness shall be determined by the manufacturer.

3.2.3 Metal Joining. The inner windings shall have a minimum of three plies of preformed metal strip without filler. The initial two plies shall be spot- welded circumferentially with a minimum of three welds spaced at a maximum distance of 3 in . The


outer windings. which shall have a minimum of three plies of preformed metal without filler, shall bc spot- welded circumferentially with a minimum of three welds, the last of which shall be the terminal weld.

The distance of the first weld from the terminal weld shall be no greater than 1.5 in . Up to four additional loose preformed metal windings beyond the terminal weld may be used to retain the gasket into the centering ring.

3.2.4 Centering Ring. All spiral-wound gaskets shall be furnished assembled into a centering ring. The centering ring thickness chal1 be from 0.1 17 in. to 0.1 3 1 in. and suitably grooved on the inside diameter so as to retain thc gasket.

3.2.5 Inner Ring. Inner rings shall be furnished (a) with all spiral-wound gaskets having PTFE (polytetra- fluoroethylcne) filler material. I t is recommended that inner rings be specified by the user for flexible graphite and other filler materials ( i f appropriate for flanges and bore sizes used), particularly wJhere experience has demonstrated inward buckling of the gaskets to be a problem. Inner rings shall be furnished in spiral-wound gaskets for flanges NPS 24 and larger in Class 900, NPS 12 and larger in Class 1 SOO, and NPS 4 and larger i n Class 2500. Gaskets with inner rings should be used only with socket welding, lapped, welding neck, and integral flanges.

Thc inner-ring thickness shall be from 0.1 17 in. to O. I3 I i n . Tables I2 through I4 show inner-ring inside diameters that may extend a maximum of 0.06 in . into the flange bore under the worst combination of flange bore. eccentric installation, and tolerance. Reference Table IS for minimum pipe wall thickness for use with gaskets with inner rings. Reference Tables 16, 17, and 18 for maximum allowable bore for use with gaskets without inner rings.

, 3.2.6 Gasket Compression. Spiral-wound gaskets

NPS v?, NPS '/', and NPS 1 in Classes 150. 300, and 600 shall be designed so that a uniform bolt stress of 25,000 psi, based on thc nominal bolt root diameter, will compress the gasket to a thickness of 0.130 in. +O.OOS in . All other gasket sizes and classes shall be designed so that a uniform bolt stress of 30.000 psi will compress the gasket to a thickness of 0.130 in. *0.005 in .

3.3 Materials

Metal windings and filler materials shall be in accordance with Table 19. The inner ring shall be of a material



that has corrosion resistant characteristics equivalent to or better than that of the metal winding. The centering ring may be carbon steel that is painted, metal plated, or otherwise coated to inhibit atmospheric corrosion.

ASME B16.20a-2000

2. I


STDOASME BLb-20A-ENGL ZOOU m 0757b70 Ob17bd5 TLiT m

METALLIC GASKETS FOR PIPE FLANGES ASME B16.20a-2000

TABLE 12 INNER-RING INSIDE DIAMETERS FOR (a) SPIRAL-WOUND GASKETS

Flange Size

(NPSI 150 300 400 (1) 600 900 Il, 2) 1500 (2, 3) 2500 (1-31

~~

Pressure Class

'12 0.56 14 0.81

1 1 .O6 1 '/4 1.50 1 '/z 1.75

2'/2 2.62

3

2 2.19

3 3.19 4 4.19 5 5.19

6 6.19 8 8.50

10 10.56 12 12.50 14 13.75

16 15.75 18 17.69 20 19.69 24 23.75

0.56 0.81 1 .O6 1.50 1.75

2.19 2.62 3.19 4.19 5.19

6.19 8.50

10.56 12.50 13.75

15.75 17.69 19.69 23.75

...

...

...

...

...

...

...

4.04 5.05

6.10 8.10

10.05 12.10 13.50

15.35 17.25 19.25 23.25

...

0.56 0.81 1 .O6 1.50 1.75

2.19 2.62 3.10 4.04 5.05

6.10 8.10

10.05 12.10 13.50

15.35 17.25 19.25 23.25

...

...

...

...

...

.. .

3.10 4.04 5.05

6.10 7.75 9.69

11.50 12.63

14.75 16.75 19.00 23.25

...

0.56 0.81 1 .O6 1.31 1.63

2.06 2.50 3.10 3.85 4.90

5.80 7.75 9.69

1 1.50 12.63

14.50 16.75 18.75 22.75

0.56 0.81 1 .O6 1.31 1.63

2.06 2.50 3.10 3.85 4.90

5.80 7.75 9.69

1 1.50 ...

...

...

...

...

GENERAL NOTES: (a) The inner-ring thickness shall be 0.117 in. to 0.131 in. (b) For sizes NPS 1'/4 through NPS 3, the inside diameter tolerance is 20.03 in.; for larger sizes

the inside diameter tolerance is k0.06 in. See Table 15 for minimum pipe wall thicknesses that are suitable for use with standard inner rings.

NOTES: (1) There are no

(a) NPS '12 through NPS 3 Class 400 flanges; therefore, use Class 600 flanges (b) NPS 72 through NPS 2'/2 Class 900 flanges; therefore, use Class 1500 flanges (c) NPS 14 and larger Class 2500 flanges

gaskets; and Class 2500, NPS 4 through NPS 12 gaskets. (2) Inner rings are required for Class 900, NPS 24 gaskets; Class 1500, NPS 12 through NPS 24

(3) Refer to para. 3.2.5 for required use of inner rings.

21


ASME B16.20a-2000 METALLIC GASKETS FOR PIPE FLANGES

TABLE 13 INNER-RING INSIDE DIAMETERS FOR SPIRAL-WOUND GASKETS USED BETWEEN ASME B16.47 SERIES A FLANGES

Flange Size Pressure Class

W S ) 150 300 400 600 900 (1, 2)

26 28 30 32 34 36

38 40 42 44 46 48

50 52 54 56 58 60

25.75 27.75 29.75 31.75 33.75 35.75

37.75 39.75 41.75 43.75 45.75 47.75

49.75 51.75 53.50 55.50 57.50 59.50

25.75 27.75 29.75 31.75 33.75 35.75

37.50 39.50 41.50 43.50 45.38 47.63

49.00 52.00 53.25 55.25 57.00 60.00

26.00 28.00 29.75 32.00 34.00 36.13

37.50 39.38 41.38 43.50 46.00 47.50

49.50 51.50 53.25 55.25 57.25 59.75

25.50 27.50 29.75 32.00 34.00 36.13

37.50 39.75 42.00 43.75 45.75 48.00

50.00 52.00 54.25 56.25 58.00 60.25

26.00 28.00 30.25 32.00 34.00 36.25

39.75 41.75 43.75 45.50 48.00 50.00

. . .

. . .

. . .

GENERAL NOTES: (a) The inner-ring thickness shall be 0.117 in. to 0.131 in. (b) The inside diameter tolerance is +0.12 in. (c) These inner rings are suitable for use with pipe walls 0.38 in. or thicker. NOTES: (1) Inner rings are required for Class 900 gaskets. (2) There are no Class 900 flanges NPS 50 and larger.

22


STD.ASME BLb.20A-ENGL 2000 m 0757b70 ObL7b87 812 m


TABLE 14 INNER-RING INSIDE DIAMETERS FOR SPIRAL-WOUND (al GASKETS USED BETWEEN ASME 616.47 SERIES B FLANGES


26 25.75 25.75 25.75 25.38 26.25 28 27.75 27.75 27.63 27.00 28.25 30 29.75 29.75 29.63 29.63 30.75 32 31.75 31.75 31.50 31.25 33.00 34 33.75 33.75 33.50 33.50 35.25 36 35.75 35.75 35.38 35.50 36.25

38 37.75 38.25 37.50 37.50 39.75 40 39.75 40.25 39.38 39.75 41.75 42 41.75 42.75 41.38 42.00 43.75 44 43.75 44.25 43.50 43.75 45.50 46 45.75 46.38 46.00 45.75 48.00 48 47.75 48.50 47.50 48.00 50.00

50 49.75 49.88 49.50 50.00 52 51.75 51.88 51.50 52.00 54 53.75 53.75 53.25 54.25 56 56.00 56.25 55.25 56.25 58 58.19 58.44 57.25 58.00 60 60.44 61.31 59.75 60.25 . . .

. . .

. . .

. . .

...

. . .

GENERAL NOTES: (a) The inner-ring thickness shall be 0.117 in. to 0.131 in. (b) The inside diameter tolerance is ~ 0 . 1 2 in. (C) These inner rings are suitable for use with pipe walls 0.375 in. or thicker. NOTES: (1) Inner rings are required for Class 900 gaskets. Refer to para. 3.2.5 for required use of

(2) There are no NPS 50 and larger Class 900 flanges. inner rings.

23


STD-ASME BLb-ZOA-ENGL 2000 E D757b70 ObL7b88 757 m


(a) TABLE 15 MINIMUM PIPE WALL THICKNESS SUITABLE FOR USE OF SPIRAL-WOUND GASKETS WITH INNER RINGS FOR ASME B16.5 FLANGES

Flange Pressure Class Size

W S ) 150 300 400 600 900 1500 2500

'12

"4 Schedule 80 1

1 1 v4 1 '/2 2 2 3

4

5

6

8

10

12

14

16 Schedule 10s

18

20

24

GENERAL NOTES:

Schedule 40

Schedule 80

Schedule 30 Schedule 80 1 (a) The pipe wall schedules identified represent the minimum recommended pipe wall thickness suitable for use with inner

(b) Gaskets with inner rings should be used only with socket welding, lapped, welding neck, and integral flanges. rings for ASME B16.5 flanges. (Reference ASME B36.10M and B36.19M.l

24


STDeASME BLb.20A-ENGL 2000 M 0759b70 Ob27689 h95 m


TABLE 18 MAXIMUM BORE OF ASME B16.47 SERIES B FLANGES FOR USE WITH SPIRAL-WOUND GASKETS


W S ) 150 300 400 600 900 111

26 28 30 32 34 36 38 40 44 46 48 50 52 54 56 58 60

Welding neck and integral flanges having maximum inside diameters as described in ASME 816.47

GENERAL NOTE: This table shows the maximum bore of flanges for which the spiral-wound gasket dimensions shown in Table 11 are recommended, considering the tolerances involved, the possibility of eccentric installation, and the possibility that the gasket may extend into the assembled flange bore. NOTES: (1) Inner rings are required for Class 900 gaskets, NPS 26 through NPS 48 (see para. 3.2.5). (2) There are no Class 900 flanges NPS 50 and larger.

27


STD=ASME BLb.20A-ENGL 2000 B 0757b70 ObL?bSO 307


(a) TABLE 19 COLOR CODING AND ABBREVIATIONS FOR SPIRAL-WOUND GASKET MATERIALS

Metallic Winding Materials

Material Abbreviation Color Code

Silver Yellow No color

No color No color Green Maroon

Blue Turquoise No color

Carbon steel 304 SS 304 L SS

CRS 304 304 L

309 SS 310 SS 316 L SS 317 L SS

347 SS 321 SS 430 SS

309 310 316 L 317 L

347 32 1 430

Ni-Cu Monel 400 Grade 400

MON Orange

Nickel 200 Titanium 20Cb-3 alloy

Ni-Mo Hastelloy B Grade B2

Ni-Mo-Cr Hastelloy C Grade C-276

NI TI A-20

Red Purple Black

HAST B . . .

Brown . . .

HAST C Beige

Ni-Cr-Fe lnconel 600 Grade 600

Ni-Cr-Fe-Cb lnconel 625 Grade 625

. . . INC 600

. . . Gold . . .

INC 625 . . .

Gold . . .

Ni-Cr-Fe-Ti lnconel X-750 Grade X-750

INX No color

Ni-Fe-Cr lncoloy 800 Grade 800

Ni-Fe-Cr-Mo-Cu lncoloy 825 Grade 825

Zirconium

. . . IN 800

. . . White

IN 825 White

ZlRC No color


STD-ASME BLb=ZOA-ENGL 2000 II 0759b70 ObL7b7L 243

ASME B16.20a-2000

MANDATORY ANNEX I REFERENCES

The following is a list of publications referenced in this Standard.

API Specification 6A - 17th Edition - 1996, Specifi-

Publisher: American Petroleum Institute (API), 1220 L

cation for Valves and Wellhead Equipment

Street, NW, Washington, DC 20005

ASME B16.5-1996, Pipe Flanges and Flanged Fittings' ASME B 16.47-1996, Large Diameter Steel Flanges:

ASME B36.10M-1996, Welded and Seamless Wrought

ASME B36.19M-1985 (R1994), Stainless Steel Pipe' Publisher: American Society of Mechanical Engineers

(ASME), Three Park Ave., New York, NY 1001 6; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007

NPS 26 through NPS 60'

Steel Pipe'

' May also be obtained from the American National Standards Institute (ANSI), I I West 42nd Street, New York, NY 10036.

IS0 9000-1: 1994, Quality management and quality assurance standards - Part 1 : Guidelines for selection and use

I S 0 9000-2: 1997, Quality management and quality assurance standards - Part 2: Generic guidelines for the application of IS0 9001, IS0 9002, and I S 0 9003

IS0 9000-3: 1997, Quality management and quality assurance standards - Part 3: Guidelines for the application of IS0 9001 to the development, supply, installation, and maintenance of computer software

IS0 9001 : 1994, Quality systems - Model for quality assurance in design, development, production, installation, and servicing

IS0 9002: 1994, Quality systems - Model for quality assurance in production, installation, and servicing

IS0 9003: 1994, Quality systems - Model for quality assurance in final inspection and test

Publisher: International Organization for Standardization (ISO), 1 me de Varembé, Case postale 56, CH-I21 1 Genève 20, SwitzerlandSuisse

35


AMERICAN NATIONAL STANDARDS FOR PIPING. PIPE FLANGES. FITTINGS. AND VALVES

Scheme for the Identification of Piping Systems ........................................................... .A13. 1.1996 Pipe Threads. General Purpose (Inch) ............................................................. B1.20.1-1983(R1992) DrysealPipeThreads(1nch) ...................................................................... B1.20.3-1976(R1998) Cast Iron Pipe Flanges and Flanged Fittings: Classes 25. 125. and 250 ........................................ ,816.1-1998 Malleable Iron Threaded Fittings: Classes 150 and 300 ...................................................... .B16. 3.1998 Gray Iron Threaded Fittings: Classes 125 and 250 .......................................................... .B16. 4.1998 Pipe Flanges and Flanged Fittings (NPS 'h Through NPS 24) ................................................ .B16. 5-1996 Factory-Made Wrought Steel Buttwelding Fittings .......................................................... .B16. 9-1993 Face-to-Face and End-to-End Dimensions of Valves ....................................................... .B16.1 0-1992 Forged Fittings. Socket-Welding and Threaded ............................................................ .816.1 1-1996 Castlron Threaded Drainage Fittings ..................................................................... 616.12-1998 Ferrous Pipe Plugs. Bushings. and Locknuts with Pipe Threads ............................................. .B16.1 4.1991 Cast Bronze Threaded Fittings: Classes 125 and 250 ................................................. B16.15-1985(R1994) Cast Copper Alloy Solder Joint Pressure Fittings .................................................... B16.18-1984(R1994) Metallic Gaskets for Pipe Flanges: Ring.Joint. Spiral-Wound. and Jacketed ................................... .B16.2 0.1998 Nonmetallic Flat Gaskets for Pipe Flanges ................................................................ .B162 1.1992 Wrought Copper and Copper Alloy Solder Joint Pressure Fittings ........................................... .B16.2 2.1995 Cast Copper Alloy Solder Joint Drainage Fittings - D W .................................................. ,816.23-1992 Cast Copper Alloy Pipe Flanges and Flanged Fittings: Classes 150. 300. 400. 600. 900. 1500. and 2500 .... B16.24-1991(R1998) Buttwelding Ends ....................................................................................... B16.25-1997 Cast Copper Alloy Fittings for Flared Copper Tubes ....................................................... .B162 6.1988 Wrought Steel Buttwelding Short Radius Elbows and Returns .............................................. .B16.2 8.1994 Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings - D W .......................... .B16.2 9-1994 Manually Operated Metallic Gas Valves for Use in Gas Piping Systems up to 125 psig

(Sizes Through 2) ............................................................................... .B16.3 3-1990 Valves - Flanged. Threaded. and Welding End ........................................................... .816.3 4-1996 Orifice Flanges ......................................................................................... 816.36-1996 Large Metallic Valves for Gas Distribution (Manually Operated. NPS 2l/* to 12. 125 psig Maximum) ...... B16.38-1985(R1994) Malleable Iron Threaded Pipe Unions .................................................................... ,816.39-1998 Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems . . . . . . . . . . . . . . . . B16.40-1985(R1994) Ductile Iron Pipe Flanges and Flanged Fittings. Classes 150 and 300 ........................................ ,816.42-1998 Manually Operated Metallic Gas Valves for Use in House Piping Systems ................................... .B16.4 4.1995 Cast Iron Fittings for Soventa Drainage Systems .......................................................... .816.4 5-1998 Large Diameter Steel Flanges (NPS 26 Through NPS 60) ................................................... .B16.4 7-1996 Steel Line Blanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.48-1997 Factory-Made Wrought Steel Buttwelding Induction Bends for Transportation and Distribution Systems . . . . . . . . .B16.4 9.2000 Power Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 831.1-1998 Fuel Gas Piping (not an ANSI standard) ................................................................... .B31. 2.1968 Process Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 831.3-1999 Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids .................................. .B31. 4.1998

Gas Transmission and Distribution Piping Systems ......................................................... .831. 8.1999 Building Services Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .831. 9-1996 Slurry Transportation Piping Systems ..................................................................... 831.11-1989 Manual for Determining the Remaining Strength of Corroded Pipelines ...................................... .B31 6.1991 Welded and Seamless Wrought Steel Pipe .............................................................. B36.10M-1996 StainlessSteel Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B36.19M-l985(R1994) Self-operated and Power-Operated Safety-Related Valves Functional Specification Standard . . . . . . . . . . . . .N278. 1.1975(R1992)

Refrigeration Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 831.5-1992

The ASME Publications Catalog shows a complete list of all the Standards published by the Society . For a complimentary catalog. or the latest information about our publications. call I-800-THE-ASME (1.800.843.27631 .


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The American Society of Mechanical Engineers

A N A M E R I C A N N A T I O N A L S T A N D A R D

METALLIE GASKETS FOR PIPE FLANGES

Ring-Joint, Spiral-Wound, and Jackeltd

ASME B1 6.20-1 MM8 (Revision 01 ASME B1 8.20-1 993)


Date of Issuance: April 28, 2000

The 1998 edition of this Standard is being issued with an automatic addenda subscription service. The use of addenda allows revisions made in response to public review comments or committee actions to be published on a regular yearly basis; revisions published in addenda will become effective 6 months after the Date of Issuance of the addenda. The next edition of this Standard is scheduled for publication in 2003.

ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard. The interpretations will be included with the above addenda service.

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 Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available 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 “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 this document, and does not undertake to insure anyone utilizing a standard against liabilityfor infringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.

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ASME accepts responsibility for only those interpretations issued in accordance with established ASME 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 Engineers Three Park Avenue, New York, NY 10016-5990

Copyright Q 2000 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

All Rights Reserved Printed in U.S.A.


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, Subcommit- tee 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 B 16.20-1 952.

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 30, 1952.

An updated version was submitted, and ASA approval was granted on April 4, 1955, with the designation ASA B 16.20- 1955. The standard was reviewed, and reaffirmation approval was granted by the ASA on April 25, 1963.

The standard was reviewed, and reaffirmation 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, this edition 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 are not included in this edition because they are included in ASMWANSI B 16.5-1 988, titled Pipe Flanges and Flanged Fittings, and ASME B16.47-1990, titled Large Diameter Steel Flanges.

The 1993 edition was approved by the BI6 Standards Committee. Following approval by ASME, approval by ANSI was given on January 22, 1993, with the designation ASME

In the 1998 edition of ASME B 16.20, reference standards are updated, a quality system program annex is added, inner ring inside diameters for spiral-wound gaskets are revised, and several editorial revisions are made. Following approval by ASME BI6 Subcommittee B and the B16 Main Committee, ANSI approved this American National Standard on November 20, 1998.

Requests for interpretations or suggestions for revision should be sent to The American Society of Mechanical Engineers; Secretary, BI6 Committee; Three Park Avenue, New York, New York 1 0 0 1 6-5990.

B16.20-1993.

... 111


ASME B16 COMMITTEE Standardization of Valves, Flanges, Fittings, Gaskets,

and Valve Actuators

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

OFFICERS

W. N. McLean, Chair R. A. Schmidt, Vice Chair

P. A. Reddington, Secretary

COMMITTEE PERSONNEL

W. L. Ballis, Consultant, London, Ohio R. W. Barnes, Anric Enterprises, Etobicoke, Ontario, Canada R. R. Brodin, Fisher Controls International, Inc., Marshalltown, Iowa M. A. Clark, Nibco, Inc., Elkhart, Indiana A. Cohen, A. Cohen and Associates, Albuquerque, New Mexico C. E. Floren, Mueller Co., Decatur, Illinois D. R. Fríkken, Solutia, Inc., St. Louis, Missouri R. Henrich, Minnegasco, Inc., Golden Valley, Minnesota J. C. Inch, Mueller Refrigeration Products Co., Hartsville, Tennessee G. A. Jolly, Vogt Valve Co., Louisville, Kentucky W. G. Knecht, BW/IP International, Inc., Williamsport, Pennsylvania R. Koester, The William Powell Co., Cincinnati, Ohio W. N. McLean, Newco Valves, Palos Park, Illinois M. L. Nayyar, Bechtel Power Corp., Gaithersburg. Maryland P. A. Reddington, American Society of Mechanical Engineers, New York, New York R. A. Schmidt, Trinity-Ladish Co., Russellville, Arkansas H. R. Sonderegger, Grinnell Corp., Cranston, Rhode Island W. M. Stephan, Flexitallic, Inc., Mount Laurel, New Jersey T. F. Stroud, Ductile Iron Pipe Research Association, Birmingham, Alabama M. D. Wasicek, ABS Americas, Houston, Texas R. E. White, Richard E. White and Associates, South Bend, Indiana D. A. Williams, Southern Company Services, Birmingham, Alabama L. A. Willis, The Dow Chemical Co., Freeport, Texas W. R. Worley, Union Carbide Corp., South Charleston, West Virginia

SUBCOMMITTEE G - GASKETS FOR FLANGED JOINTS

W. M. Stephan, Chair, Flexitallic, Inc., Mount Laurel, New Jersey C. B. Gillis, Vice Chair, Lamons Gasket Co., Houston, Texas B. P. Feder, Secretary, American Society of Mechanical Engineers, New York, New York K. A. Benton, Leader Gasket, Inc., Houston, Texas W. E. Holden, Solutia, Inc., Alvin, Texas D. H. Monroe, Consultant, Birmingham, Alabama R. T. Mueller, ExxonMobil Research and Engineering Co., Florham Park, New Jersey D. F. Reid, Garlock Metallic Gasket Division, Houston, Texas J. Tzeng, Ucar Carbon Co., Inc., Parma, Ohio W. R. Worley, Union Carbide Corp., South Charleston, West Virginia


CORRESPONDENCE WITH THE B16 COMMllTEE

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. Correspondence should be addressed to:

Secretary, B 16 Main Committee The American Society of Mechanical Engineers Three Park Avenue New York, NY 10016-5990

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 BI6 Committee will render an interpretation of any requirement of the Standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the B 16 Main Committee.

The request for interpretation should be clear and unambiguous. I t is further recommended that the inquirer submit hidher 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, which 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 BI6 Main Committee regularly holds meetings, which are open to the public. Persons wishing to attend any meeting should contact the Secretary of the BI6 Main Committee.


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 minimizing 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, US. 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 .I40 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.


CONTENTS

Foreword ................................................................................. Committee Roster .......................................................................... Correspondence With the B I6 Committee .................................................... Important Information Concerning Use of Asbestos or Alternative Materials .....................

1 Scope ...............................................................................

2 Ring-Joint Gaskets .................................................................

3 Spiral-Wound Gaskets ..............................................................

4 Jacketed Gaskets ...................................................................

Tables 1 Maximum Hardness for Ring Gaskets .................................................. 2 Ring Gasket Markings ................................................................ 3 Type R Ring Gasket Dimensions and Tolerances ....................................... 4 Pipe Sizes for Type R Ring Gaskets Suitable for Referenced Standards .................. 5 Type RX Ring Gasket Dimensions and Tolerances ..................................... 6 Pipe Sizes for Type RX Ring Gaskets Suitable for Referenced Standards ................ 7 Type BX Ring Gasket Dimensions and Tolerances ..................................... 8 Pipe Sizes for Type BX Ring Gaskets Suitable for Referenced Standards ................ 9 Dimensions for Spiral-Wound Gaskets Used With ASME B16.5 Flanges .................

10 Dimensions for Spiral-Wound Gaskets Used With ASME B16.47 Series A Flanges ...... 11 Dimensions for Spiral-Wound Gaskets Used With ASME B16.47 Series B Flanges ....... 12 Inner-Ring Inside Diameters for Spiral-Wound Gaskets .................................. 13 Inner-Ring Inside Diameters for Spiral-Wound Gaskets Used Between ASME

B 16.47 Series A Flanges ............................................................ 14 Inner-Ring Inside Diameters for Spiral-Wound Gaskets Used Between ASME

B16.47 Series B Flanges ............................................................ 15 Minimum Pipe Wall Thickness Suitable for Use With Inner Rings for

ASME B 16.5 Flanges ............................................................... 16 Maximum Bore of ASME B 16.5 Flanges for Use With Spiral-Wound Gaskets ........... 17 Maximum Bore of ASME 816.47 Series A Flanges for Use With

Spiral-Wound Gaskets .............................................................. 18 Maximum Bore of ASME B 16.47 Series B Flanges for Use With

Spiral-Wound Gaskets .............................................................. 19 Color Coding and Abbreviations for Spiral-Wound Gasket Materials ..................... 20 Example Markings for Spiral-Wound Gaskets ........................................... 21 Jacketed Gasket Dimensions for ASME B16.5 Flanges .................................. 22 Jacketed Gasket Dimensions for ASME B 16.47 Series A Flanges ....................... 23 Jacketed Gasket Dimensions for ASME B 16.47 Series B Flanges ....................... 24 Abbreviations for Identifying Materials for Jacketed Gaskets ............................ 25 Example Markings for Jacketed Gaskets ...............................................

... 111

V

vii ix

1

1

2

3

1 2 4 7 IO 12 13 14 16 18 20 21

22

23

24 25

26

27 28 29 30 31 32 33 33

xi


Mandatory Annex I References ........................................................................... 35

Nonmandatory Annex A Quality System Program .............................................................. 37


ASME 816.20-1998


Ring-Joint, Spiral-Wound, and Jacketed

1 SCOPE

1.1 General

This Standard covers materials, dimensions, tolerances, and markings for metal ring-joint gaskets, spiral- wound metal gaskets, metal-jacketed gaskets, and filler material. These gaskets are dimensionally suitable for use with flanges described in reference flange standards ASME B16.5, ASME B16.47, and API Specification 6A. This Standard covers spiral-wound metal gaskets and metal-jacketed gaskets for use with raised-face and flat-face flanges.

1.2 Quality Systems

Requirements relating to the product manufacturers' quality system programs are described in Annex A.

1.3 References

Standards and specifications adopted by reference in this Standard are shown in Annex I, which is part of this Standard.

2 RING-JOINT GASKETS

2.1 Types

Ring-joint gaskets shall be either octagonal or oval in cross section.

2.2 Size

Ring-joint gaskets shall be identified by an R, RX, or BX number that relates to flange size (NPS), pressure class, and the appropriate flange standards (ASME 816.5, ASME B16.47, or API Specification 6A).

2.3 Materials

2.3.1 General. Ring-joint gasket materials, some of which are listed in Table I , shall be selected by the user based on suitability for the service conditions.

TABLE 1 MAXIMUM HARDNESS FOR RING GASKETS

Maximum Hardness

Ring Gasket Material Brinell Rockwell "B" Scale

Soft iron (1) 90 56 Low-carbon steel 120 68 4-6 chrome SiMo 130 72 Type 410 170 86 Type 304 160 83 Type 316 160 83 Type 347 160 83

NOTE: ( 1 ) May be low-carbon steel, not t o exceed maximum


It is recommended that ring-joint gaskets be of a lesser hardness than that of the mating flanges.

2.3.2 Hardness. Ring-joint gaskets of materials listed in Table 1 shall have a hardness equal to or less than that shown in Table 1.

2.4 Marking

The outer surface of each gasket shall carry the manufacturer's name or identification trademark and gasket number prefixed by the letters R, RX, or BX followed by the gasket material identification. Materials shall be identified as shown in Table 2. The gasket shall also be marked with an ASME B 16.20 designation. The marking shall be applied so as not to harmfully distort the gasket or affect the integrity of the seal.


Dimensions and tolerances for ring-joint gaskets shall be as shown in Tables 3 through 8.

2.6 Surface Finish

Types R and RX gaskets shall have a finish not rougher than 63 Fin. roughness. Type BX gaskets shall have a finish not rougher than 32 Fin. roughness. Surface finishes shall pertain to the gasket-sealing surfaces.

I


ASME 816.20-1998

TABLE 2 RING GASKET MARKINGS

Ring Gasket Material Identification Marking Example (1)

Soft iron (2) D R51D Low-carbon steel S R51S 4-6 chrome '/zMo F5 (3) R51F5 Type 410 S 410 R51S410 Type 304 S 304 R51S304 Type 316 S 316 R51S316 Type 347 S 347 R51 S347

NOTES: (1) This number shall be preceded by the manufacturer's

(2) May be low-carbon steel, not to exceed maximum

(3) F5 identification designates ASTM Specification A 182-

name or identification trademark.


72 chemical composition requirements only.

2.7 Identification Number

Dimensional reference identification numbers are as- signed to ring-joint gaskets and are shown in Tables 3 through 8.

3 SPIRAL-WOUND GASKETS

3.1 Size and Class

Spiral-wound gaskets, including centering ring and inner ring (paras. 3.2.4 and 3.2.5), are identified by flange size (NPS), pressure class, and the appropriate flange standard (ASME B16.5 or ASME B 16.47).


3.2.1 General. Dimensions and tolerances for spiral-wound gaskets, centering rings, and inner rings shall be in accordance with Tables 9 through I 1 and as specified in this section.

3.2.2 Construction. Spiral-wound gaskets shall be constructed as alternate plies (circular layers counted as revolutions) of preformed metal windings and plaint fillers that are spirally wound. For the finished gasket, the filler shall be essentially flush with, but not below, the metal winding on both contact faces of the gasket. The metal strip in the winding shall be 0.006 in. to 0.009 in. thick. The filler material thickness shall be determined by the manufacturer.

3.2.3 Metal Joining. The inner windings shall have a minimum of three plies of preformed metal strip without filler. The initial two plies shall be spot- welded circumferentially with a minimum of three welds spaced at a maximum distance of 3 in. The

2


outer windings, which shall have a minimum of three plies of preformed metal without filler, shall be spot- welded circumferentially with a minimum of three welds, the last of which shall be the terminal weld.

The distance of the first weld from the terminal weld shall be no greater than 1.5 in. Up to four additional loose preformed metal windings beyond the terminal weld may be used to retain the gasket into the centering ring.

3.2.4 Centering Ring. All spiral-wound gaskets shall be furnished assembled into a centering ring. The centering ring thickness shall be from 0.1 17 in. to O. 13 I in. and suitably grooved on the inside diameter so as to retain the gasket.

3.2.5 Inner Ring. Inner rings shall be furnished with all spiral-wound gaskets having PTFE (polytetrafluoroethylene) filler material. It is recommended that inner rings be specified by the user for flexible graphite and other filler materials (if appropriate for flanges and bore sizes used), particularly where experience has demonstrated inward buckling of the gaskets to be a problem. Inner rings shall be furnished in spiral-wound gaskets for flanges NPS 24 and larger in Class 900, NPS 12 and larger in Class 1500, and NPS 4 and larger in Class 2500. Gaskets with inner rings should be used only with socket welding, lapped, welding neck, and integral flanges.

The inner-ring thickness shall be from 0.1 17 in. to O. 13 I in. Tables 12 through 14 show inner-ring inside diameters that may extend a maximum of 0.06 in. into the flange bore under the worst combination of flange bore, eccentric installation, and tolerance.

3.2.6 Gasket Compression. Spiral-wound gaskets NPS y!, NPS v4, and NPS 1 in Classes 150, 300, and 600 shall be designed so that a uniform bolt stress of 25,000 psi, based on the nominal bolt root diameter, will compress the gasket to a thickness of 0.130 in. k0.005 in. All other gasket sizes and classes shall be designed so that a uniform bolt stress of 30,000 psi will compress the gasket to a thickness of O. 130 in. .c0.005 in.

3.3 Materials

Metal windings and filler materials shall be in accordance with Table 19. The inner ring shall be of a material that has corrosion resistant characteristics equivalent to or better than that of the metal winding. The centering ring may be carbon steel that is painted, metal plated, or otherwise coated to inhibit atmospheric corrosion.



3.4 Marking

3.4.1 General. The centering ring of each spiral- wound gasket shall be permanently marked. The lettering height shall be a minimum of 0.1 in. The following information shall be included with the centering ring markings:

(a) Manufacturer’s name or trademark. (b) Flange size (NPS). (c) Pressure class. (d) Winding metal abbreviation (Table l9), except

that the abbreviation may be omitted when 304 stainless steel is used.

( e ) Filler material abbreviation (Table 19). (f) Centering and inner ring metal abbreviation (Ta-

ble 19), except that the abbreviation may be omitted when carbon steel is used for the outer ring and 304 stainless steel is used for the inner ring.

(g) Flange identification. Gaskets intended for ASME B 16.47 flanges shall be marked B 16.47 A or B 16.47 B, as applicable. Gaskets intended for ASME B16.5 flanges need not be so marked. Illustrative marking examples are shown in Table 20.

( h ) ASME B16.20 designation.

3.4.2 Pressure Class. Gaskets suitable for more than one pressure class shall be marked with all applicable classes, as shown in Table 20.

3.4.3 Color Coding. Spiral-wound gaskets shall be marked with a color code that identifies the windings and filler materials. A continuous color around the outer edge of the centering ring shall identify the winding metal. The color identifying the filler material for NPS 1 and larger shall have four intermittent stripes spaced approximately 90 deg apart on the outer edge of the centering ring. Smaller size gaskets shall have a minimum of two stripes 180 deg apart. The colors shall conform to those listed i n Table 19.

4 JACKETED GASKETS

4.1 Size and Pressure Class

Jacketed gaskets are identified by flange size (NPS), pressure class, and the appropriate flange standard (ASME B 16.5 or ASME B 16.47).

ASME B16.20-1998

4.2 Design

4.2.1 General. Jacketed gaskets shall be made with a filler material enclosed in a metal jacket.

4.2.2 Jacket Thickness. The jacket metal thickness shall be a minimum of 0.015 in.

4.2.3 Filler Thickness. The filler thickness shall be a minimum of 0.06 in.

4.2.4 Miscellaneous. Other design details, including the density of the filler, shall be the gasket manufacturer’s responsibility.


Gasket dimensions and tolerances shall be in accordance with Tables 21, 22, or 23.

4.4 Materials

Metal jacket and filler material shall be selected from Table 24. For jacketed gasket limitations related to ASME B 16.5 applications, see Annex E of ASME B16.5.

4.5 Marking

4.5.1 Applied Marking. Jacketed gaskets shall be marked with waterproof ink or equivalent. Where gasket size does not permit such markings, a separate attached marking tag may be used. The lettering height shall be a minimum of 0.2 in. The following information shall be included with the markings:

(a) Manufacturer’s name or trademark. (b) Flange size (NPS). (c) Pressure class. (dl Jacketed material abbreviation (Table 24), except

that the abbreviation may be omitted when soft carbon steel is used.

(e ) Filler material abbreviation (Table 24). (f) Flange identification. Gaskets intended for ASME

B 16.47 flanges shall be marked B 16.47 A or B 16.47 B, as applicable. Gaskets intended for ASME B 16.5 flanges need not be so marked. Illustrative marking examples are shown in Table 25.

(g) ASME B 16.20 designation.

4.5.2 Pressure Class. Gaskets suitable for more than one pressure class shall be marked with all applicable classes.

3


ASME 816.20-1998

23 deg

n


Octagonal Oval

TABLE 3 TYPE R RING GASKET DIMENSIONS AND TOLERANCES

Height of Ring Width of Flat on Radius in Ring Pitch Diameter Width of Oval, Octagonal, Octagonal Ring, Octagonal

Number of Ring, P Ring, A B H C Ring, R,

R-I 1 1.344 0.250 0.44 0.38 0.170 R-I2 1.563 0.313 0.56 0.50 0.206 R-I3 1.688 0.313 0.56 0.50 0.206 R-14 1.750 0.313 0.56 0.50 0.206 R-15 1.875 0.313 0.56 0.50 0.206

R-I6 2.000 0.3 13 0.56 0.50 0.206 R-17 2.250 0.313 0.56 0.50 0.206 R-I8 2.375 0.313 0.56 0.50 0.206 R-19 2.563 0.313 0.56 0.50 0.206 R-20 2.688 0.313 0.56 0.50 0.206

R-21 2.844 0.438 0.69 0.63 0.305 R-22 3.250 0.313 0.56 0.50 0.206 R-23 3.250 0.438 0.69 0.63 0.305 R-24 3.750 0.438 0.69 0.63 0.305 R-25 4.000 0.313 0.56 0.50 0.206

R-26 4.000 0.438 0.69 0.63 0.305 R-27 4.250 0.438 0.69 0.63 0.305 R-28 4.375 0.500 0.75 0.69 0.341 R-29 4.500 0.313 0.56 O. 50 0.206 R-30 4.625 0.438 0.69 0.63 0.305

0.06 0.06 0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.06

R-31 4.875 0.438 0.69 0.63 0.305 0.06 R-32 5.000 0.500 0.75 0.69 0.341 0.06 R-33 5.188 0.313 0.56 0.50 0.206 0.06 R-34 5.188 0.438 0.69 0.63 0.305 0.06 R-35 5.375 0.438 0.69 0.63 0.305 0.06

(continued)

4


METALLIC GASKETS FOR PIPE FLANGES ASME 816.20-1998

TABLE 3 TYPE R RING GASKET DIMENSIONS AND TOLERANCES (CONT'D)

Average Height of Ring Width of Flat on Radius in Ring Pitch Diameter Width of Oval, Octagonal, Octagonal Ring, Octagonal

Number of Ring, P Ring, A B H c Ring, R,

R-36 R-37 R-38 R-39 R-40

R-41 U-42 u-43 u-44 u-45

R-46 R-47 R-48 R-49 R-50

R-51 R-52 u-53 R-54 R-55

R-56 R-57 R-58 R-59 R-60

R-61 R-62 R-63 R-64 R-65

R-66 R-67 R-68 R-69 R-70

R-7 1 R-72 R-73 u-74 R-75

U-76 R-77 R-78 R-79 R-80

5.875 5.875 6.188 6.375 6.750

7.125 7.500 7.625 7.625 8.313

8.313 9.000 9.750

10.625 10.625

11 .o00 12.000 12.750 12.750 13.500

15.000 15.000 15.000 15.625 16.000

16.500 16.500 16.500 17.875 18.500

18.500 18.500 20.375 21.000 2 1 .o00

2 1 .o00 22.000 23.000 23.000 23.000

26.500 27.250 27.250 27.250 24.250

0.31 3 0.438 0.625 0.438 0.313

0.438 0.750 0.313 0.438 0.438

0.500 0.750 0.3 13 0.438 0.625

0.875 0.313 0.438 0.625 1.125

0.313 0.438 0.875 0.3 13 1.250

0.438 0.625 1 .o00 0.313 0.438

0.625 1.125 0.313 0.438 0.750

1.125 0.3 13 0.500 0.750 1.250

0.313 0.625 1 .o00 1.375 0.313

0.56 0.69 0.88 0.69 0.56

0.69 1 .o0 0.56 0.69 0.69

0.75 1 .o0 0.56 0.69 0.88

1.13 0.56 0.69 0.88 1.44

0.56 0.69 1.13 0.56 1.56

0.69 0.88 1.31 0.56 0.69

0.88 1.44 0.56 0.69 1 .o0

1.44 0.56 0.75 1 .o0 1.56

0.56 0.88 1.31 1.75 . . .

0.50 0.63 0.81 0.63 0.50

0.63 0.94 0.50 0.63 0.63

0.69 0.94 0.50 0.63 0.81

1 .O6 0.50 0.63 0.81 1.38

0.50 0.63 1.06 0.50 1.50

0.63 0.81 1.25 O. 50 0.63

0.81 1.38 0.50 0.63 0.94

1.38 0.50 0.69 0.94 1.50

0.50 0.81 1.25 1.63 0.50

0.206 0.305 0.413 0.305 0.206

0.305 0.485 0.206 0.305 0.305

0.341 0.485 0.206 0.305 0.413

0.583 0.206 0.305 0.413 0.780

0.206 0.305 0.583 0.206 0.879

0.305 0.413 0.681 0.206 0.305

0.413 0.780 0.206 0.305 0.485

0.780 0.206 0.341 0.485 0.879

0.206 0.413 0.681 0.977 0.206

0.06 0.06 0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.09

0.06 0.06 0.06 0.06 0.09

0.06 0.06 0.09 0.06 0.06

0.06 0.09 0.06 0.06 0.06

0.09 0.06 0.06 0.06 0.09

0.06 0.06 0.09 0.09 0.06

(continued)

5


ASME 816.20-1998 METALLIC GASKETS FOR PIPE FLANGES

TABLE 3 TYPE R RING GASKET DIMENSIONS AND TOLERANCES (CONT'D)

Average Height of Ring Width of Flat on Radius in Ring Pitch Diameter Width of Oval, Octagonal, Octagonal Ring, Octagonal

Number of Ring, P Ring, A B H C Ring, RI

R-81 25.000 0.563 ... 0.75 0.377 R-82 2.250 0.438 . . . 0.63 0.305 R-84 2.500 0.438 ... 0.63 0.305 R-85 3.125 0.500 ... 0.69 0.341

R-86 3.563 0.625 . . . 0.81 0.413 R-87 3.938 0.625 . . . 0.81 0.413 R-88 4.875 0.750 . . . 0.94 0.485 R-89 4.500 0.750 . . . 0.94 0.485 R-90 6.125 0.875 . . . 1 .O6 0.583

R-9 1 10.250 1.250 . . . 1.50 0.879 R-92 9.000 0.438 0.69 0.63 0.305 R-93 29.500 0.750 . . . 0.94 0.485 R-94 31.500 0.750 ... 0.94 0.485 R-95 33.750 0.750 ... 0.94 0.485

R-96 36.000 0.875 . . . 1 .O6 0.583 R-97 38.000 0.875 . . . 1 .O6 0.583 R-98 40.250 0.875 . . . 1 .O6 0.583 R-99 9.250 0.438 . . . 0.63 0.305 R-I00 29.500 1.125 . . . 1.38 0.780

R-101 31.500 1.250 . . * 1.50 0.879 R-I02 33.750 1.250 . . . 1.50 0.879 R-103 36.000 1.250 . . . 1.50 0.879 R-104 38.000 1.375 ... 1.63 0.977 R-105 40.250 1.375 . . . 1.63 0.977

0.06 0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.06

0.09 0.06 0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.09

0.09 0.09 0.09 0.09 0.09

GENERAL NOTE: All dimensions are in inches. TOLERANCES:

P = average pitch diameter of ring, k0.007 A = width of ring, 20.008

B, H = height of ring, +0.05, -0.02 Variation in height throughout the entire circumference of any given ring shall not exceed 0.02 within these tolerances.

C = width of flat on octagonal ring, k0.008 R,. = radius in ring, 20.02

23 deg = angle, kv2 deg



TABLE 4 PIPE SIZES FOR TYPE R RING GASKETS SUITABLE FOR REFERENCED STANDARDS

Pressure Classes

Ring ASME 616.5 API 68 ASME 816.47 Series A

Number 150 300-600 900 1500 2500 720-960 (1) 2000 3000 5OOO 150 300-600 900

R-1 1 R-12 R-13 R-14 R-15 R-16

R-17 R-18 R-19 R-20 R-21 R-22

R-23 R-24 R-25 R-26 R-27 R-28

R-29 R-30 (2)

R-31 R-32 R-33 R-34

R-35 R-36 R-37 R-38 R-39 R-40

R-4 1 R-42 R-43 R-44 R-45 R-46

R-47 13-48 R-49 R-50 R-51 R-52 R-53 R-54

. . .

. . .

. . .

. . . 1

. . . 1 '/4

1 v 2

...

...

. . . 2

. . .

. . . 2 v 2

. . .

. . .

. . . 3

. . .

. . .

. . . 3

...

... 4

. . .

. . .

. . . 5

. . .

. . . 6

. . .

. . .

. . .

. . . 8

. . .

. . .

. . . 10 . . . . . .

'12

14

. . . 3

. . .

. . . 1

. . . 1 '/4

1 '/2 . . .

. . .

. . . 2

...

. . . 2Y2

...

...

. . . 3 3

. . .

. . . 3'/2

. . .

. . . 4

. . .

. . .

. . . 5

...

. . .

... 6

. . .

. . .

. . . 8

. . .

. . .

. . . 10 . . .

... li2

... 3 14

... 1

. . . 1 '/4

1 '/z . . .

. . .

...

. . . 2

. . .

... 2%

...

...

... 3

...

. . .

. . .

. . .

. . . 4

. . .

. . .

. . . 5

...

...

... 6

...

...

... a

. . .

...

. . . 10 . . .

... 1 12

14

. . . 3

... 1

... 1 '/4

1 Y2 . . . . . . . . . . . . 2

. . .

. . . 21/2

. . .

...

. . .

...

...

...

. . .

3 . . . . . . . . . 4

. . .

. . .

. . .

. . . 5

6 . . .

. . .

...

. . . 8

. . .

. . .

. . * 10

. . .

. . . 5;

'/4

. . .

. . .

... 1

. . .

... 1 Y4

... 1 '/2

,.. . . . 2

* . . 2'4

. . .

. . .

. . . 3

...

...

...

...

... 4

. . .

. . .

. . . 5

. . .

. . .

. . .

. . .

6 ... ... ...

a ... ... . . .

. . .

...

...

...

... 1

... 1 y4

... 1 5;

...

. . . 2

..,

. . . 2 '/z

. . .

. . .

. . .

. . . 3

...

...

...

...

... 4

. . .

. . .

. . .

5 . . . . . . . . . 6

. . .

...

... 8

...

. . .

. . . 10 . . .

. . .

. . .

. . .

. . .

. . . 1

. . . 1 '/4

. . . 1 1 4

. . .

. . . 2 ... ... 25i

...

. . .

. . .

. . . 3

. . .

. . .

. . .

. . .

. . . 4

...

...

... 5

...

. . .

. . . 6

. . .

. . .

. . . 8

...

...

... 10 . . .

. . .

. . .

. . .

. . .

. . . 1

. . . 1 '/4

1 '/2 . . . ... ... ... 2

...

... 2 1/2

...

. . .

. . . 3

. . .

. . .

. . .

...

. . . 4

...

. . .

. . . 5

. . .

. . .

. . . 6

. . .

. . .

... 8

...

. . .

. . . 10 . . .

...

...

...

...

... 1

. . . 1 1/4

1 5; . . .

. . .

. . .

. . . 2

. . .

. . . 214

...

...

...

...

...

. . .

. . .

3 . . . 3'4

... 4

...

...

. . .

. . . 5

6 . . .

. . .

. . .

. . . 8

...

. . .

. . . 10

. . .

. . .

. . .

..,

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

...

...

...

...

...

...

. . I

. . .

. . .

. . .

. . .

. . .

...

...

...

. . .

. . .

. . .

. . .

. . .

. . .

...

...

. . .

...

...

. . .

. . .

. . .

. . .

. . .

...

...

...

...

...

. . .

...

...

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

...

. . .

...

...

...

. . .

. . .

. . .

...

...

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

... . I .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

...

...

...

...

. f .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

...

...

...

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

...

...

. . .

. . .

. . .

. . .

. . .

. . .

. . .

. . .

...

(continued)

7


STD-ASME BLb*E!U-ENGL


TABLE 4 PIPE SIZES FOR TYPE R RING GASKETS SUITABLE FOR REFERENCED STANDARDS (CONT'D)

Pressure Classes

Ring ' ASME B16.5 API 6B ASME 616.47 Series A

Number 150 300-600 900 1500 2500 720-960 (1) 2000 3000 10000 (1) 150 300-600 900

R-55 R-56 R-57 R-58

. . . 12

. . . ... ... 10

12 12 . . . . . . . . . ... 12 . . .

. . . ... ... . . . . . . . . . 12

...

... 12 ...

... 12

. . . 12

. . . . . . . . .

. . . . . . 12

... ... . . . ... ... . . . . . .

R-59 R-60 R-61 R-62 R-63 R-64

R-65 R-66 R-67 R-68 R-69 R-70

14 . . . ... . . . . . . . . . ... . . . 12 14 ... . . . . . . . . . 14 _ . . . . . . . . . . . 14 . . . . . . . . . . . . . . . 16 . . . . . . . . . ... 16 . . . . . . ... . . . 16 . . .

18 . . . ... . . . . . . 18 ... ...

... . . . . . . . . .

. . .

. . . 14

...

. . . 14

. . .

. . . 14

... . . . ... ... ... ... . . . ...

... . . . 14 ... ... ...

... 14 . . . . . . ... . . . ...

... . . . ... ... 16

...

... . . . . . .

. . .

. . . ... ... ... . . . ...

16 16 . . . ... 16 ... 16 16 ... . . . ...

... ... ... ...

. . . l a

. . .

... 18

...

... . . . 18

...

. . . l a

... ... ...

. . . ... l a

. . . ... ... ... 18 . . . . . .

R-7 1 R-72 R-73 R-74 R-75 R-76

R-77 R-78 R-79 R-80 R-81 R-82

R-a4 R-85 R-86 R-a7 R-88 R-a9

R-90 R-91 R-92 R-93 R-94 R-95

. . . . . . l a . . .

20 ... ... ... * . . 20 ... ... . . . ... 20 ...

. . . ... ... . . . . . . 20 . . .

. . . ... ... . . . . . . . . .

20 ... 20 ...

...

... 20

. . . ... ...

. . . ... 20

. . . ... . . .

. . . ... ...

. . . 20 . . . ...

. . .

. . . 24 . . . ... ... ..

. . . ... 24

. . . ... ...

. . . . . . ...

... 22 . . .

. . . . . . 22 1 . . . ...

1Y2 ... ...

2'/2 ... ...

3v2 ... ...

2 . . . ... 3 ... ... 4 ... ...

5 ... . . . 10 ... . . .

. . . ... 26

. . . . . . 2a

. . . . . . 30

. . . . . . ...

24 ... . . . . . . . . . 24 . . . . . . . . . ... 24 . . .

...

...

...

...

...

...

. . .

. . .

. . .

...

...

...

. . .

. . .

. . .

. . .

. . .

. . . 24 . . . . . . . . .

... . . . . . . . . . ... . . . . . . . . . ... . . . . . . ...

... . . . . . . . . .

. . .

. . .

...

...

...

. . . ... . . . . . . . . . ... ... ... ... ... . . .

. . . ... . . . . . .

. . . ... . . . . . . . . . . . . . . . . . .

. . . ... ... . . .

. . . ... ... . . .

. . . . . . . . . . . . ... ...

...

... ... ...

...

...

...

...

. . . . . . . . .

... . . . . . . ... ... ... ... ... ...

...

...

...

...

...

...

. . . . . . . . . ...

. . . . . . . . . ... . . . . . . . . .

...

...

... . . . . . . ... ... ... ...

(continued)

8



TABLE 4 PIPE SIZES FOR TYPE R RING GASKETS SUITABLE FOR REFERENCED STANDARDS (CONT'D)

ASME 816.20-1998

Pressure Classes

Ring ASME B16.5 API 6B ASME 816.47 Series A

Number 150 300-600 900 1500 2500 720-960 (1) 2000 3000 10000 (11 150 300-600 900

R-96 . . . . . . ... . . . . . . . . . . . . . . * ... ... 32 ... R-97 . . . . . . . . . ... . . . . . . . . . . . . ... . . . 34 ... R-98 . . . . . . . . . ... . . . ... . . . . . . ... . . . 36 ... R-99 . . . . . . . . . . . . ... . . . 8 8 ... . . . . . . . . . R-I00 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 R-101 . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . 28

R-102 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 R-I03 . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 32 R-IO4 . . . ... . . . . . . . . . . . . . . . . . . . . . ... . . . 34 R-105 . . . . . . ... ... . . . . . . . . . . . . ... ... . . . 36

GENERAL NOTE: End flanges to API 6D and API 600 use gaskets for equivalent pipe size under ASME B16.5 or ASME B16.47 series A. NOTES: (1) Class 720, 960, and 10000 flanges to API 6B are obsolete. Data are for information only. (2) R-30 is for lapped joint only.

9


ASME B16.20-1998

23 deg


TABLE 5 TYPE RX RING GASKET DIMENSIONS AND TOLERANCES

Outside Diameter Width Width Height of Height Radius Hole Ring of Ring, of Ring, of Flat, Outside Bevel, of Ring, of Ring, Size,

Number OD A C D H S E (1)

RX-20 3.000 0.344 O. 182 O. 125 0.750 0.06 RX-23 3.672 0.469 0.254 O. 167 1 .o00 0.06 RX-24 4.172 0.469 0.254 0.167 1 .o00 0.06 RX-25 4.313 0.344 0.182 0.125 0.750 0.06 RX-26 4.406 0.469 0.254 O. 167 1 .o00 0.06 . . .

. . .

. . .

. . .

. . .

RX-27 RX-31 RX-35 RX-37 RX-39

RX-41 RX-44 RX-45 RX-46 RX-47

RX-49 RX-50 RX-53 RX-54 RX-57

4.656 5.297 5.797 6.297 6.797

7.547 8.047 8.734 8.750 9.656

1 1 .O47 11.156 13.172 13.28 1 15.422

0.469 0.469 0.469 0.469 0.469

0.469 0.469 0.469 0.531 0.781

0.469 0.656 0.469 0.656 0.469

0.254 0.254 0.254 0.254 0.254

0.254 0.254 0.254 0.263 0.407

0.254 0.335 0.254 0.335 0.254

O. 167 O. 167 0.167 O. 167 O. 167

O. 167 O. 167 O. 167 0.188 0.271

O. 167 0.208 O. 167 0.208 O. 167

1 .o00 1 .o00 1 .o00 1 .o00 1 .o00

1 .o00 1.000 1 .o00 1.125 1.625

1 .o00 1.250 1 .o00 1.250 1 .o00

0.06 0.06 0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.09

0.06 0.06 0.06 0.06 0.06

...

...

...

...

. . .

. . .

. . .

...

...

...

. . .

. . .

...

... RX-63 17.391 1 .O63 0.582 0.333 2.000 0.09 RX-65 18.922 0.469 0.254 O. 167 1 .o00 0.06 RX-66 18.031 0.656 0.335 0.208 1.250 0.06 RX-69 2 1.422 0.469 0.254 O. 167 1 .o00 RX-70 21.656 0.781 0.407 0.271 1.625 0.09 . . .

...

...

... 0.06 ...

(continued)

10


METALLlC GASKETS FOR PtPE FLANGES ASME 816.20-1998

TABLE 5 TYPE RX RING GASKET DIMENSIONS AND TOLERANCES (CONT'D)

Outside Diameter Width Width Height of Height Radius Hole Ring of Ring, of Ring, of Flat, Outside Bevel, of Ring, of Ring, size,

Number OD A C D H RI E (11

RX-73 RX-74

RX-82 ~ x - 8 4 RX-85

RX-86 RX-87 RX-88 RX-89 RX-90

RX-91 RX-99 RX-201 RX-205 RX-210 RX-2 15

23.469 23.656

2.672 2.922 3.547

4.078 4.453 5.484 5.109 6.875

11.297 9.672 2.026 2.453 3.844 5.547

0.531 0.781

0.469 0.469 0.531

0.594 0.594 0.688 0.719 0.781

1.188 0.469 0.226 0.219 0.375 0.469

0.263 0.407

0.254 0.254 0.263

0.335 0.335 0.407 0.407 0.479

0.780 0.254 O. 126 0.120 0.213 0.210

0.208 0.271

0.167 O. 167 0.167

0.188 0.188 0.208 0.208 0.292

0.297 0.167 0.057 0.072 (2) 0.125 (2) 0.167 (2)

1.250 1.625

1 .o00 1 .o00 1 .O00

1.125 1.125 1.250 1.250 1.750

1.781 1 .o00 0.445 0.437 O .7 50 1.000

0.06 0.09

0.06 0.06 0.06

0.06 0.06 0.06 0.06 0.09

0.09 0.06 0.02 (3) 0.02 (3) 0.03 (3) 0.06 (3)

. . .

. . . 0.06 0.06 0.06

0.09 0.09 0.12 0.12 0.12

0.12 ..

. . .

. . .

. . . GENERAL NOTE All dimensions are in inches. NOTES: (1) Rings RX-82 through RX-91 only require one pressure passage hole as illustrated. The center line of the hole shall be located

(2) Tolerance on these dimensions is +O, -0.015. (3) Tolerance on these dimensions is +O.OZ, -0. TOLERANCES:

at the midpoint of dimension C.

OD = outside diameter of ring, +O.OZO. -0 A = width of ring, +0.008, -0

C = width of flat, +0.006, -0 D = height of outside bevel, +O, -0.03 H = height of ring, +0.008, -0

R, = radius of ring, 20.02

Variation in width throughout the entire circumference of any ring shall not exceed 0.004 within these tolerances.

Variation in height throughout the entire circumference of any ring shall not exceed 0.004 within these tolerances.

23 dag = angle, A?; deg E = hole size, +_0.02

I I



TABLE 6 PIPE SIZES FOR TYPE RX RING GASKETS SUITABLE FOR REFERENCED STANDARDS

Pressure Classes

API 68

Ring 720-960 Number 2000 (1 I 2900 Il) 3000 5000

RX-20 RX-23 RX-24 RX-25 RX-26

RX-27 RX-31 RX-35 RX-37 RX-39

1 '/z 2

. . .

3 ... 4

. . .

...

...

...

...

...

...

...

. . .

. . .

. . .

1 '/2 1 v 2

. . . 2

. . . 2 378

... 2'/2 272 3 ...

. . . 3 4 ...

. . . 4

... RX-41 5 . . . 5 RX-44 ... . . . . . . 5 RX-45 6 . . . 6

RX-47 ... . . . . . . 8 (2)

RX-49 8 . . . 8 RX-50 . . . . . . ... 8 RX-53 10 . . . 10 RX-54 ... . . . ... 10 RX-57 12 . . . 12

RX-63 ... . . . ... 14 RX-65 16 . . . RX-66 ... . . . 16 ... RX-69 18 . . . RX-70 ... . . . 18

... RX-46 ... ... . . . 6

...

...

...

... ...

... ... . . .

... ... RX-73 20 . . . RX-74 ... . . . 20 ... RX-82 ... 1 ... ... RX-84 ... 1 5; ... ... RX-85 ... 2 ... ...

RX-86 . . . RX-87 . . . RX-88 . . . RX-89 ... RX-90 ...

2% ... ... 3 ... ... 4 ... ...

5 ... ... 3'/2 ... ...

RX-91 . . . 10 ... ... RX-99 8 (2) . . . 8 (2) ... RX-201 . . . . . . ... 1 v* RX-205 . . . . . . ... 1 Y16

RX-210 . . . . . . ... 2% 6

RX-2 15 . . . . . . ... 4%s

NOTES: (1) Class 720, 960, and 2900 flanges to API 66 are obsolete. Data are for information only. (2) Crossover flange ,connection.

12



TABLE 7 TYPE BX RING GASKET DIMENSIONS AND TOLERANCES

Outside Diameter Height Width Outside Diameter Width Hole Ring Nominal of Ring, of Ring, of Ring, of Flat, of Flat, Size,

Number Size, in. OD H A ODT c D (1)

BX- 1 50 BX-151 BX-152 BX-153 BX-154

BX-155 BX-I 56 BX- 1 57 BX-158 BX-159

BX-160 EX-161 BX- 1 62 BX-163 BX-164

2.842 3.008 3.334 3.974 4.600

5.825 9.367

11.593 13.860 16.800

0.366 0.379 0.403 0.448 0.488

0.560 0.733 0.826 0.91 1 1.012

0.366 0.379 0.403 0.448 0.488

0.560 0.733 0.826 0.91 1 1.012

2.790 2.954 3.277 3.910 4.531

5.746 9.263

1 1.476 13.731 16.657

0.314 0.325 0.346 0.385 0.419

0.06 0.06 0.06 0.06 0.06

0.481 0.629 0.709 0.782 0.869

0.06 0.12 0.12 0.12 0.12

15.850 19.347 18.720 2 1.896 22.463

0.938 1.105 0.560 1.185 1.185

0.541 O. 638 0.560 0.684 0.968

15.717 19.191 18.641 21.728 22.295

0.408 0.482 0.481 0.516 0.800

0.12 0.12 0.06 0.12 0.12

BX-165 BX-166 BX-167 EX-168 BX-169

BX-170 BX-17 1 BX-172 BX-303

24.595 25.198 29.896 30.128 6.831

8.584 10.529 13.113 33.573

1.261 1.261 1.412 1.412 0.624

0.560 0.560 0.560 1.494

0.728 1 .O29 0.516 0.632 0.509

0.560 0.560 0.560 0.668

24.417 25.020 29.696 29.928 6.743

8.505 10.450 13.034 33.361

0.550 0.851 0.316 0.432 0.421

0.12 0.12 0.06 0.06 0.06

0.481 0.481 0.481 0.457

0.06 0.06 0.06 0.06

GENERAL NOTES: (a) All dimensions are in inches. (b) Radius R shall be 8% to 12% of the gasket height H.

(continued)

13



NOTES TO TABLE 7 (CONT'D)

NOTE: (1) One pressure passage hole is required per gasket as illustrated. The center line of the hole shall be located at the midpoint

TOLERANCES: of dimension C.

OD = (outside diameter of ring) +O, -0.005 H = (height of ring) +0.008, -0

A = (width of ring) +0.008, -0 Variation in height throughout the entire circumference of any ring shall not exceed 0.004 within these tolerances.

Variation in width throughout the entire circumference of any ring shall not exceed 0.004 within these tolerances. ODT = (outside diameter of flat) k0.002

C = (width of flat) +0.006, -0 D = (hole size) 20.02 R = (radius of ring) see General Note (b)

23 deg = (angle) +v4 deg

TABLE 8 PIPE SIZES FOR TYPE BX RING GASKETS SUITABLE FOR REFERENCED STANDARDS

Pressure Classes

API 6BX Ring Number 2000 3000 S000 10000 15000 20000

BX-150 . . . ... . . . 1 ' V16 1 'Yl6 . .. BX-151 . . . ... ... 1 13/16 I 'Yl6 1 "4 8

BX-152 . . . ... ... 2 '11 6 2 % ~ 2%6 BX-153 . . . . . . ... 29/16 29/16 2916 BX-154 . . . . . . ... 3 1/16 3'/16 3716

BX-155 ... . . . . . . 4 '11 6 4% 6 4% 6 BX-156 ... . . . . . . 7 '11 6 7 '11 6 7716 BX-157 ... . . . . . . 9 9 9 BX-158 ... . . . * . . 11 11 11 BX-159 ... ... . . . 13'/8 1378 1378

BX-160 . . . ... 1378 . . . . . . %X-161 . . . . .. 1674 . . . . . . BX-162 . . . . . . 1 S3/4 1674 1674 BX-163 . . . . . . 1874 . . . . . . BX-164 . . . . . . . . . 18% 1874

BX-165 BX-166 BX- 1 67 %X- 168 %X- 1 69

%X-170 BX-171 BX-172 BX-303

... . . .

... . . . 26'/4 . . . ... 26'/4 . . . ...

. . . ...

. . . ...

. . . . . . 30 30

21 v 4

. . .

...

...

...

...

...

...

... 2 1 '/4 ... ... 5 Y* 65/8

1 1 '/32 8% 6

...

...

...

. . .

...

. . .

. . .

...

. . .

...

. . .

...

. . .

...

...

...

...

. . .

14


MET

ALLI

C G

ASKE

TS

FOR

PIPE

FL

ANG

ES

ASM

E B1

6.20

-199

8

I.5


R

5 W

s

TAB

LE

9 D

IMEN

SIO

NS

FOR

SP

IRAL

-WO

UN

D

GAS

KETS

U

SED

W

ITH

AS

ME

B16

.5

FLAN

GES

f?

Out

side

Diam

eter

of

G

aske

t (2

) i

Flan

ge

Clas

ses

Clas

ses

Size

15

0,

300.

90

0,

1500

, In

side

Diam

eter

of

G

aske

t by

Cl

ass

(3)

Out

side

Diam

eter

of

Ce

nter

ing

Ring

by

Cl

ass

(4)

W’S

) 40

0.60

0 25

00

150

300

400

(51

600

900

(1,

5)

1500

(1

) 25

00

(1,

5)

150

300

400

(5)

600

SOO(

5)

1500

25

00(5

)

6 8.

25

8.25

7.

19

8 10

.38

10.1

3 9.

19

10

12.5

0 12

.25

11.3

1 12

14

.75

14.5

0 13

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14

16.0

0 15

.75

14.6

3

1.25

1.

25

0.75

1.

56

1.56

1

.oo

1.88

1.

88

1.25

2.

38

2.38

1.

88

2.75

2.

75

2.13

3.38

3.

38

2.75

3.

88

3.88

3.

25

4.75

4.

75

4.00

5.

88

5.88

5.

00

7.00

7.

00

6.13

0.75

0.

75

1.00

1.

00

1.25

. .

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1.88

. .

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2.13

. .

2.13

2.75

. .

2.

75

3.25

. .

3.

25

4.00

. .

4.

00

5.00

4.

75

4.75

6.

13

5.81

5.

81

7.19

6.

88

6.88

9.19

8.

88

8.88

11

.31

10.8

1 10

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13.3

8 12

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12.8

8 14

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14.2

5 14

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. . . . .

I.. . . .

3.

75

4.75

5.

81

6.88

8.75

10

.88

12.7

5 14

.00

0.75

0.

75

1.88

1.

00

1.00

2.

25

1.25

1.

25

2.63

1.

56

1.56

3.

00

1.88

1.

88

3.38

2.31

2,

31

4.13

2.

75

2.75

4.

88

3.63

3.

63

5.38

4.

63

4.63

6.

88

5.63

5.

63

7.75

6.75

6.

75

8.75

8.

50

8.50

11

.00

10.5

0 10

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13.3

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12.5

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5.

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10.5

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14.2

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15.7

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17.1

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16.6

3 16

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18.0

0 19

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20.5

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20.7

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18,6

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18.5

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23.3

8 24

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25.1

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22.7

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23.8

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25.5

0 26

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27.5

0 29

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. . .

24

27.0

0 26

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24.7

5 24

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24.7

5 24

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24.7

5 24

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. . .

28.2

5 30

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30.2

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33.0

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. . .

GEN

ERAL

NO

TES:

(a

) Fo

r re

fere

nce,

se

e Ta

ble

9 illu

stra

tion

begi

nnin

g on

pr

eviou

s pa

ge.

(b)

The

gask

et-th

ickne

ss

tole

ranc

e is

iO.0

05

in.

mea

sure

d ac

ross

th

e m

etal

lic

porti

on

of t

he

gask

et

not

incl

udin

g th

e fill

er,

which

m

ay

prot

rude

sli

ghtly

be

yond

th

e m

etal

. (c

) Fo

r lim

itatio

ns

on

the

max

imum

fla

nge

bore

fo

r us

e wi

th

thes

e sp

iral-w

ound

ga

sket

s,

see

Tabl

e 16

.

NOTE

S:

(II

Inne

r rin

gs

are

requ

ired

for

all

PTFE

fil

led

gask

ets

and

for

Clas

s 90

0 ga

sket

s,

NPS

24;

Clas

s 15

00

gask

ets,

NP

S 12

th

roug

h NP

S 24

; an

d Cl

ass

2500

ga

sket

s,

NPS

4 th

roug

h NP

S 12

(s

ee

para

. 3.

2.5

and

Tabl

e 12

). (2

) Th

e ga

sket

ou

tsid

e di

amet

er

tole

ranc

e fo

r NP

S ‘/2

thr

ough

NP

S 8

is r

0.03

in

.; fo

r NP

S 10

th

roug

h NP

S 24

, +0

.06

in.,

-0.0

3 in

. (3

) Th

e ga

sket

in

side

di

amet

er

tole

ranc

e fo

r NP

S 5;

th

roug

h NP

S 8

is

iO.0

16

in.;

for

NPS

10

thro

ugh

NPS

24,

kO.03

in

. B

(4)

The

cent

erin

g rin

g ou

tsid

e di

amet

er

tole

ranc

e is

20.

03

in.

9 (5

) Th

ere

are

no

Clas

s 40

0 fla

nges

in

NP

S 1/

Z th

roug

h NP

S 3

(use

Cl

ass

8001

, Cl

ass

900

flang

es

in

NPS

‘/*

thro

ugh

NPS

2’/*

(use

Cl

ass

1500

), or

Cl

ass

2500

fla

nges

4

NPS

14

and

large

r.


Cent

ering

rin

g ou

tsid

e di

amet

er

TAB

LE

10 I

LLU

STR

ATIO

N

0.11

7 in

.413

1 in

. th

ick

I r

Cent

ering

rin

g

[Not

e (l)

l, -0

.131

in

. th

ick


52

a ii TA

BLE

10

D

IMEN

SIO

NS

FOR

SP

IRAL

-WO

UN

D

GAS

KETS

U

SED

W

ITH

AS

ME

B16

.47

SER

IES

A FL

ANG

ES

1.

Clas

s 15

0 Cl

ass

300

Clas

s 40

0 Cl

ass

600

Clas

s 90

0 (1

1 8

Gas

ket

Cent

ering

Ri

ng

Gas

ket

Cent

ering

Ri

ng

Gas

ket

Cent

ering

Ri

ng

Gas

ket

Cent

ering

Ri

ng

Gas

ket

Cent

ering

Ri

ng

Flan

ge

Insid

e O

utsid

e O

utsid

e In

side

Out

side

Out

side

insi

de

Out

side

Out

side

Insid

e O

utsid

e O

utsid

e In

side

Out

side

Out

side

Sire

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

W’S

) (2

) (3

) (4

) 12

) (3

) (4

) (2

) (3

) (4

) (2

) (3

) (4

) (2

,5)

(3,5

) (4

. 5)

26

26.5

0 27

.75

30.5

0 27

.00

29.0

0 32

.88

27.0

0 29

.00

32.7

5 27

.00

29.0

0 34

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27.0

0 29

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34.7

5

28

28.5

0 29

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5 29

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35.3

8 29

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31 .o

o 35

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29.0

0 31

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36.0

0 29

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31.0

0 37

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30

30.5

0 31

.75

34.7

5 31

.25

33.2

5 37

.50

31.2

5 33

.25

37.2

5 31

.25

33.2

5 38

.25

31.2

5 33

.25

39.7

5

32

32.6

0 33

.88

37.0

0 33

.50

35.5

0 39

.63

33.5

0 35

.50

39.5

0 33

.50

35.5

0 40

.25

33.5

0 35

.50

42.2

5 34

34

.50

35.8

8 39

.00

35.5

0 37

.50

41.6

3 35

.50

37.5

0 41

.50

35.5

0 37

.50

42.2

5 35

.50

37.5

0 44

.75

36

36.5

0 38

.13

41.2

5 37

.63

39.6

3 44

.00

37.6

3 39

.63

44.0

0 37

.63

39.6

3 44

.50

37.7

5 39

.75

47.2

5

38

38.5

0 40

.13

43.7

5 38

.50

40.0

0 41

.50

38.2

5 40

.25

42.2

5 39

.00

41.0

0 43

.50

40.7

5 42

.75

47.2

5 40

40

.50

42.1

3 45

.75

40.2

5 42

.13

43.8

8 40

.38

42.3

8 44

.38

41.2

5 43

.25

45.5

0 43

.25

45.2

5 49

.25

42

42.5

0 44

.25

48.0

0 42

.25

44.1

3 45

.88

42.3

8 44

.38

46.3

8 43

.50

45.5

0 48

.00

45.2

5 47

.25

51.2

5

00

44

44.5

0 46

.38

50.2

5 44

.50

46.5

0 48

.00

44.5

0 46

.50

48.5

0 45

.75

47.7

5 50

.00

47.5

0 49

.50

53.8

8 46

46

.50

48.3

8 52

.25

46.3

8 48

.38

50.1

3 47

.00

49.0

0 50

.75

47.7

5 49

.75

52.2

5 50

.00

52.0

0 56

.50

48

48.5

0 50

.38

54.5

0 48

.63

50.6

3 52

.13

49.0

0 51

.00

53.0

0 50

.00

52.0

0 54

.75

52.0

0 54

.00

58.5

0

50

50.5

0 52

.50

56.5

0 51

.oo

53.0

0 54

.25

51.0

0 53

.00

55.2

5 52

.00

54.0

0 57

.00

. .

. .

. .

. *

I

52

52.5

0 54

.50

58.7

5 53

.00

55.0

0 56

.25

53.0

0 55

.00

57.2

5 54

.00

56.0

0 59

.00

*. .

. .

. .

. .

54

54.5

0 56

.50

61 .O

O 55

.25

57.2

5 58

.75

55.2

5 57

.25

59.7

5 56

.25

58.2

5 61

.25

. .

. . .

.

. .

.

56

56.5

0 58

.50

63.2

5 57

.25

59.2

5 60

.75

57.2

5 59

.25

61.7

5 58

.25

60.2

5 63

.50

. . .

.

. .

. .

58

58.5

0 60

.50

65.5

0 59

.50

61.5

0 62

.75

59.2

5 61

.25

63.7

5 60

.50

62.5

0 65

.50

. .

. ,

. .

. .

. 60

60

.50

62.5

0 67

.50

61.5

0 63

.50

64.7

5 61

.75

63.7

5 66

.25

62.7

5 64

.75

60.2

5 .

. ,

. . .

. .

.

3E

GEN

ERAL

NO

TES:

?

(a)

For

refe

renc

e,

see

Tabl

e 10

illu

stra

tion

begi

nnin

g on

pr

eviou

s pa

ge.

F

ib)

The

gask

et-th

ickne

ss

tole

ranc

e is

kO.

005

in.

mea

sure

d ac

ross

th

e m

etal

lic

porti

on

of t

he

gask

et

not

incl

udin

g th

e fill

er,

which

m

ay

prot

rude

sli

ghtly

be

yond

th

e m

etal

. 5

(c)

For

limita

tions

on

th

e m

axim

um

flang

e bo

re

for

use

with

th

ese

spira

l-wou

nd

gask

ets,

se

e Ta

ble

17.

G,

id)

ASM

E 61

6.47

Se

ries

A fla

nges

NP

S 12

th

roug

h NP

S.24

ha

ve

the

sam

e ra

ised

face

di

men

sions

as

AS

ME

B16.

5 fla

nges

. R

NOTE

S:

I?!

(1)

Inne

r rin

gs

are

requ

ired

for

all

PTFE

ga

sket

s an

d Cl

ass

900

gask

ets,

NP

S 26

th

roug

h NP

S 48

(s

ee

para

. 3.

2.5

and

Tabl

e 13

). ;:

(2)

The

gask

et

insi

de

diam

eter

to

lera

nce

for

NPS

26

thro

ugh

NPS

34

is i

O.0

3 in

., an

d th

e to

lera

nce

for

NPS

36

thro

ugh

NPS

60

is k

O.05

in

. (3

) Th

e ga

sket

ou

tsid

e di

amet

er

tole

ranc

e fo

r NP

S 26

th

roug

h NP

S 60

is

iO

.06

in,

B (4

) Th

e ce

nter

ing

ring

outs

ide

diam

eter

to

lera

nce

is i

O.0

3 in

. s

(5)

Ther

e ar

e no

Cl

ass

980

flang

es

NPS

50

and

large

r. 3 5 5 tn


0.11

7 in

.-0.1

31

in.

thick

I r

Cent

ering

rin

g

[Not

e (1

)1,

-0.1

31

in.

thick

Cent

ering

rin

g ou

tsid

e di

amet

er

TAB

LE

11 I

LLU

STR

ATIO

N


TAB

LE

11

DIM

ENSI

ON

S FO

R

SPIR

AL-W

OU

ND

G

ASKE

TS

USE

D

WIT

H

ASM

E 61

6.47

SE

RtE

S 6

FLAN

GES

Clas

s 15

0 Cl

ass

300

Clas

s 40

0 Cl

ass

600

Clas

s 90

0 (1

)

Gas

ket

Cent

ering

Ri

na

Gas

ket

Cent

ering

Ri

na

Gas

ket

Cent

ering

Ri

ng

Gas

ket

Cent

ering

Ri

ns

Gas

ket

Cent

ering

Rina

Fl

ange

In

side

Out

side

Out

side

Insid

e O

utsid

e O

utsid

e In

side

Out

side

Out

side

Insid

e O

utsid

e O

utsid

e In

side

Out

side

Out

side

Size

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

Diam

eter

Di

amet

er

(NPS

) (2

) (3

) (4

) (2

1 (3

) (4

1 (2

) (3

) (4

) (2

) (3

) (4

) (2

.5)

13.5

1 (4

.51

26

26.5

0 27

.50

28.5

6 26

.50

28.0

0 30

.38

26.2

5 27

.50

29.3

8 26

.13

28.1

3 30

.13

27.2

5 29

.50

33.0

0 28

28

.50

29.5

0 30

.56

28.5

0 30

.00

32.5

0 28

.13

29.5

0 31

.50

27.7

5 29

.75

32.2

5 29

.25

31.5

0 35

.50

30

30.5

0 31

.50

32.5

6 30

.50

32.0

0 34

.88

30.1

3 31

.75

33.7

5 30

.63

32.6

3 34

.63

31.7

5 33

.75

37.7

5

32

32.5

0 33

.50

34.6

9 32

.50

34.0

0 37

.00

32.0

0 33

.88

35.8

8 32

.75

34.7

5 36

.75

34.0

0 36

.00

40.0

0 34

34

.50

35.7

5 36

.81

34.5

0 36

.00

39.1

3 34

.13

35.8

8 37

.88

35.0

0 37

.00

39.2

5 36

.25

38.2

5 42

.25

36

36.5

0 37

.75

38.8

8 36

.50

38.0

0 41

.25

36.1

3 38

.00

40.2

5 37

.00

39.0

0 41

.25

37.2

5 39

.25

44.2

5

38

38.3

7 39

.75

41.1

3 39

.75

41.2

5 43

.25

38.2

5 40

.25

42.2

5 39

.00

41 .

a0

43.5

0 40

.75

42.7

5 47

.25

40

40.2

5 41

.88

43.1

3 41

.75

43.2

5 45

.25

40.3

8 42

.38

44.3

8 41

.25

43.2

5 45

.50

43.2

5 45

.25

49.2

5

42

42.5

0 43

.88

45.1

3 43

.75

45.2

5 47

.25

42.3

8 44

.38

46.3

8 43

.50

45.5

0 48

.00

45.2

5 47

.25

51.2

5 44

44

.25

45.8

8 47

.13

45.7

5 47

.25

49.2

5 44

.50

46.5

0 48

.50

45.7

5 47

.75

50.0

0 47

.50

49.5

0 53

.88

46

46.5

0 48

.19

49.4

4 47

.88

49.3

8 51

.88

47.0

0 49

.00

50.7

5 47

.75

49.7

5 52

.25

50.0

0 52

.00

56.5

0 48

48

.50

50.0

0 51

.44

49.7

5 51

.63

53.8

8 49

.00

51.0

0 53

.00

50.0

0 52

.00

54.7

5 52

.00

54.0

0 58

.50

50

50.5

0 52

.19

53.4

4 51

.a8

53

.38

55.8

8 51

.00

53.0

0 55

.25

52.0

0 54

.00

57.0

0 . .

.

. .

, *

. 52

52

.50

54.1

9 55

.44

53.8

8 55

.38

57.8

8 53

.00

55.0

0 57

.25

54.0

0 56

.00

59.0

0 54

64

.50

56.0

0 57

.63

55.2

5 57

.25

60.2

5 55

.25

57.2

5 59

.75

56.2

5 58

.25

61.2

5 :::

.

. .

. .

. .

. .

,..

56

56.8

8 58

.18

59.6

3 58

.25

60.6

6 62

.75

57.2

5 59

.25

61.7

5 58

.25

60.2

5 63

.50

. . .

.

. .

. .

.

58

59.0

7 60

.19

62.1

9 60

.44

61.9

4 65

.19

59.2

5 61

.25

63.7

5 60

.50

62.5

0 65

.50

60

61.3

1 62

.44

64.1

9 62

.56

64.1

9 67

.19

61.7

5 63

.75

66.2

5 62

.75

64.7

5 68

.25

:: :

:::

: :

:

GEN

ERAL

NO

TES:

(a

) Fo

r re

fere

nce,

se

e Ta

ble

11

illust

ratio

n be

ginn

ing

on

prev

ious

page

. (b

) Th

e ga

sket

-thick

ness

to

lera

nce

is t

o.00

5 in

. m

easu

red

acro

ss

the

met

allic

po

rtion

of

th

e ga

sket

no

t in

clud

ing

the

filler

, wh

ich

may

pr

otru

de

sligh

tly

beyo

nd

the

met

al.

(c)

For

limita

tions

on

th

e m

axim

um

flang

e bo

re

for

use

with

th

ese

spira

l-wou

nd

gask

ets,

se

e Ta

ble

18.

NOTE

S:

(I)

Inne

r rin

gs

are

requ

ired

for

all

PTFE

ga

sket

s an

d fo

r Cl

ass

900

gask

ets,

NP

S 26

th

roug

h NP

S 48

(s

ee

para

. 3.

2.5

and

Tabl

e 14

). (2

) Th

e ga

sket

in

side

di

amet

er

tole

ranc

e fo

r NP

S 26

th

roug

h NP

S 34

is

kO.

03

in.,

and

the

tole

ranc

e fo

r NP

S 36

th

roug

h NP

S 60

is

20.

05

in.

(3)

The

gask

et

outs

ide

diam

eter

to

lera

nce

for

NPS

26

thro

ugh

Nf?S

60

is

ho.

06

in.

(4)

The

cent

erin

g rin

g ou

tsid

e di

amet

er

tole

ranc

e is

iO

.03

in.

(5)

Ther

e ar

e no

Cl

ass

906

flang

es

NPS

50

and

large

r.



TABLE 12 INNER-RING INSIDE DIAMETERS FOR SPIRAL-WOUND GASKETS

Flange Size

(NPS) 150 300 400 (1) 600 900 (1.2) 1500 (2.3) 2500 (1-3)

Pressure Class

72 0.56 I 4 0.81

1 1 .O6 1 1/4 1.50 1 v 2 1.75

2 ‘/2 2.62

3

2 2.19

3 3.19 4 4.19 5 5.19

6 6.19 8 8.50 10 10.56 12 12.50 14 13.75

16 15.75 18 17.69 20 19.69 24 23.75

0.56 0.81 1 .O6 1.50 1.75

2.19 2.62 3.19 4.19 5.19

6.19 8.50 10.56 12.50 13.75

15.75 17.69 19.69 23.75

...

...

...

...

...

...

...

4.04 5.05

6.10 8.10 10.05 12.10 13.50

15.35 17.25 19.25 23.25

...

0.56 0.81 1 .O6 1.50 1.75

2.19 2.62 3.10 4.04 5.05

6.10 8.10 10.05 12.10 13.50

15.35 17.25 19.25 23.25

...

...

...

...

...

...

3.10 4.04 5.05

6.10 7.75 9.69 11.50 12.63

14.75 16.75 19.00 23.25

...

0.56 0.81 1 .O6 1.31 1.63

2.06 2.50 3.10 3.85 4.90

5.80 7.75 9.69 11.50 12.63

14.50 16.75 18.75 22.75

0.56 0.81 1 .O6 1.31 1.63

2 .O6 2.50 3.10 3.85 4.90

5.80 7.75 9.69 11.50 ... ... ... ... ...

GENERAL NOTES: (a) The inner-ring thickness shall be 0.117 in. to 0.131 in. (b) For sizes NPS 1’/4 through NPS 3, the inside diameter tolerance is k0.03 in.; for larger sizes

the inside diameter tolerance is 20.06 in. See Table 15 for minimum pipe wall thicknesses that are suitable for use with standard inner rings.

NOTES: (1) There are no Class 400 flanges NPS through NPS 3 (use Class 600). Class 900 flanges

NPS ’I2 through NPS 2v2 (use Class 1500), or Class 2500 flanges NPS 14 and larger. (2) Inner rings are required for Class 900, NPS 24 gaskets; Class 1500, NPS 12 through NPS 24

gaskets; and Class 2500, NPS 4 through NPS 12 askets. (3) The inner-ring inside diameters shown for NPS l!. through NPS 21/2 in Class 1500 and 2500

will produce inner-ring widths of 0.12 in., a practical minimum for production purposes.

21


STDDASME BLb-ZU-ENGL L998 m 0759b70 ObLbSbL 3bL


TABLE 13 INNER-RING INSIDE DIAMETERS FOR SPIRAL-WOUND GASKETS USED BETWEEN ASME B16.47 SERIES A FLANGES

Flange Size

INPS) 150 300 400 600 900 (1. 21

Pressure Class

26 28 30 32 34 36

38 40 42 44 46 48

50 52 54 56 58 60

25.75 27.75 29.75 31.75 33.75 35.75

37.75 39.75 41.75 43.75 45.75 47.75

49.75 51.75 53.50 55.50 57.50 59.50

25.75 27.75 29.75 31.75 33.75 35.75

37.50 39.50 41 -50 43.50 45.38 47.63

49.00 52.00 53.25 55.25 57.00 60.00

26.00 28.00 29.75 32.00 34.00 36.13

37.50 39.38 41.38 43.50 46.00 47.50

49.50 51.50 53.25 55.25 57.25 59.75

25.50 27.50 29.75 32.00 34.00 36.13

37.50 39.75 42.00 43.75 45.75 48.00

50.00 52.00 54.25 56.25 58.00 60.25

26.00 28.00 30.25 32.00 34.00 36.25

39.75 41.75 43.75 45.50 48.00 50.00

... . . ..

. . .

. . .

. . .

GENERAL NOTES: (a) The inner-ring thickness shall be 0.117 in. to 0.131 in. (b) The inside diameter tolerance is 20.12 in. (c) These inner rings are suitable for use with pipe walls 0.38 in. or thicker. NOTES: (1) Inner rings are required for Class 900 gaskets. (2) There are no Class 900 flanges NPS 50 and larger.

22



TABLE 14 INNER-RING INSIDE DIAMETERS FOR SPIRAL-WOUND GASKETS USED BETWEEN ASME B16.47 SERIES B FLANGES

ASME 816.20-1998

Flange Site

W S )

26 28 30 32 34 36

Pressure Class

150 300 400 600 900 (1. 21

25.75 25.75 25.75 25.38 26.25 27.75 27.75 27.63 27.00 28.25 29.75 29.75 29.63 29.63 30.75 31.75 31.75 31.50 3 1.25 33.00 33.75 33.75 33.50 33.50 35.25 35.75 35.75 35.38 35.50 36.25

38 37.75 38.25 37.50 37.50 39.75 40 39.75 40.25 39.38 39.75 41.75 42 41.75 42.75 41.38 42.00 43.75 44 43.75 44.25 43.50 43.75 45.50 46 45.75 46.38 46.00 45.75 48.00 48 47.75 48.50 47.50 48.00 50.00

50 49.75 49.88 49.50 50.00 52 51.75 51.88 51 50 52.00 54 53.75 53.75 53.25 54.25 56 56.00 56.25 55.25 56.25 58 58.19 58.44 57.25 58.00 . . . 60 60.44 61.31 59.75 60.25 . . .

. . .

...

...

. . .

GENERAL NOTES: (a) The inner-ring thickness shall be 0.117 in. to 0.131 in. (b) The inside diameter tolerance is t0.12 in. (c) These inner rings are suitable for use with pipe walls 0.38 in. or thicker. NOTES: (1) Inner rings are required for Class 900 gaskets. (2) There are no Class 900 flanges NPS 50 and larger.

23



TABLE 15 MINIMUM PIPE WALL THICKNESS SUITABLE FOR USE WITH INNER RINGS FOR ASME 616.5 FLANGES


INPSI 150 300 400 600 900 1500 2500

'h 74 Schedule 80

1 '/4 1 '/z

2'/2

1

2 Schedule 40

3

4

5 Schedule 80

6

8

10

12

14

16 Schedule 10s Schedule 30 Schedule 80

18

20

24

24


Flan

g Si

ze

(NPS

-r e

3 4 6 8

bi

10

12

14

16

18

20

24

3 Y F

TAB

LE

16

MAX

IMU

M

BOR

E O

F AS

ME

B16

.5

FLAN

GES

FO

R

USE

W

ITH

SP

IRAL

-WO

UN

D

GAS

KETS

r 0 n

75

150

I 30

0

No

flang

es

WN

flang

e on

ly (2

)

SO

flang

e (3

) W

N fla

nge

(2)

SO

flang

e (3

) W

N fla

nge,

an

y bo

re

SO

flang

e

WN

flang

e,

any

bore

-_

Pres

sure

Cl

ass

E

400

600

900

(1)

1500

(1

) 25

00

(1)

3

No

flang

es

Use

Clas

s 60

0

WN

flang

e on

ly (2

)

SO

flang

e (3

) W

N fla

nge,

an

y bo

re

SO

flang

e (3

) W

N fla

nge,

an

y bo

re

WN

flang

e on

ly (2

)

WN

flang

e wi

th

Sche

dule

10

s bo

re

desc

ribed

in

AS

ME

B36.

19M

[in

clud

es

nozz

le (4

) bu

t ex

clude

s SO

fla

nge]

WN

flang

e wi

th

Sche

dule

10

s bo

re

desc

ribed

in

AS

ME

B36.

19M

[e

xclu

des

nozz

le (4

) an

d SO

fla

nge]

(5

)

P

WN

flang

e wi

th

SW

bore

[in

clud

es

nozz

le (4

) bu

t ex

clude

s so

fla

nael

WN

flang

e wi

th

Sche

dule

80

bo

re

exclu

des

nozz

le (4

) an

d SO

fla

nge]

(5

) No

fla

nges

GEN

ERAL

NO

TES:

(a

) Th

is

tabl

e sh

ows

the

max

imum

bo

re

of

flang

es

for

which

th

e sp

iral-w

ound

ga

sket

di

men

sions

sh

own

in

Tabl

e 9

are

reco

mm

ende

d co

nsid

erin

g th

e to

lera

nces

inv

olved

, po

ssib

le

ecce

ntric

in

stal

latio

n,

and

the

poss

ibilit

y th

at

the

gask

et

may

ex

tend

in

to

the

asse

mbl

ed

flang

e bo

re.

(b)

For

max

imum

pe

rmiss

ible

fla

nge

bore

s fo

r no

nman

dato

ry

inne

r rin

gs,

see

Tabl

e 15

. (c

) Ab

brev

iatio

ns:

SO

= sl

ip

on

and

thre

aded

W

N =

weld

ing

neck

SW

=

stan

dard

wa

ll

NOTE

S:

(1)

Inne

r rin

gs

are

requ

ired

for

Clas

s 90

0 ga

sket

s,

NPS

24;

Clas

s 15

00

gask

ets,

NP

S 12

thr

ough

NP

S 24

; an

d Cl

ass

2500

ga

sket

s,

NPS

4 th

roug

h NP

S 12

(s

ee

para

. 3.

2.5)

. Th

ese

inne

r rin

gs

may

ex

tend

in

to

the

pipe

bo

re

a m

axim

um

of

0.06

in

. un

der

the

wors

t co

mbi

natio

n of

m

axim

um

bore

, ec

cent

ric

inst

alla

tion,

an

d ad

ditiv

e to

lera

nces

. (2

) In

the

se

sizes

th

e ga

sket

is

sui

tabl

e fo

r a

weld

ing

neck

fla

nge

with

a

stan

dard

wa

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TABLE 17 MAXIMUM BORE OF ASME 816.47 SERIES A FLANGES FOR USE WITH SPIRAL-WOUND GASKETS


(NPS) 150 300 400 600 900 (1)

26 28 30 32

34 36 38 40

42 44 46 48

50 52 56 58 60

GENERAL NOTE: This table shows the maximum bore of flanges for which the spiral-wound gasket dimensions shown in Table 10 are recommended, considering the tolerances involved, the possibility of eccentric installation, and the possibility that the gasket may extend into the assembled flange bore. NOTES: (1) Inner rings are required for Class 900 gaskets, NPS 26 through NPS 48 (see para. 3.2.5). (2) Applies only to welding neck flanges with a bore not larger than the inside diameter of a

0.187-in. wall pipe. Larger bores must be checked individually. (3) Applies only to welding neck flanges with a bore not larger than the inside diameter of a

0.25-in. wall pipe, except that NPS 38, Class 300, is not suitable for a bore larger than the inside diameter of a 0.30-in. wall pipe. Larger bores must be checked individually.

(4) There are no Class 900 flanges in NPS 50 through 60.

26


STDeASHE B L b - Z O - E N G L 1778 0 7 5 7 b 7 0 O b L b S b b 743 m


TABLE 18 MAXIMUM BORE OF ASME B16.47 SERIES B FLANGES FOR USE WITH SPIRAL-WOUND GASKETS


Welding neck and integral flanges having maximum inside diameters as described in ASME 816.47

(NPS) 150 300 400 600 900 (1)

26 28 30 32 34 36 38 40 44 46 48 50 (2) 52 (2) 54 (2) 56 (2) 58 (2) 60 (2)

GENERAL NOTE: This table shows the maximum bore of flanges for which the spiral-wound gasket dimensions shown in Table 11 are recommended, considering the tolerances involved, the possibility of eccentric installation, and the possibility that the gasket may extend into the assembled flange bore. NOTES: (1) Inner rings are required for Class 900 gaskets, NPS 26 through NPS 48 (see para. 3.2.5). (2) There are no Class 900 flanges NPS 50 and larger.

27



TABLE 19 COLOR CODING AND ABBREVIATIONS FOR SPIRAL-WOUND . GASKET MATERIALS

Metallic Winding Materials

Material

Carbon steel 304 SS 304 L SS

309 SS 310 SS 316 L SS

347 SS 321 SS 430 SS

Ni-Cu Monel 400 Grade 400

Nickel 200 Titanium 20Cb-3 alloy

N ¡-Mo Hastelloy B Grade B2

Ni-Mo-Cr Hastelloy C Grade C-276

Ni-Cr-Fe lnconel 600 Grade 600

Ni-Cr-FeCb lnconel 625 Grade 625

Ni-Cr-Fe-Ti lnconel X-750 Grade X-750

Ni-Fe-Cr lncoloy 800 Grade 800

Ni-Fe-C-Mo-Cu lncoloy 825 Grade 825

Zirconium

Abbreviation

CRS 304 304 L

309 310 316 L

347 32 1 430

... MON ... NI TI A-20

. . . HAST B ... ... HAST C ... . . . INC 600 . . . ... INC 625 ... ... INX . . . . . . IN 800 . . . . . . IN 825 ... ZlRC

Color Code

Silver Yellow No color

No color No color Green

Blue Turquoise No color

. . . Orange ... Red Purple Black

. . . Brown ... . . . Beige ... ... Gold ... . . . Gold . . . ... No color ... ... White . . . ... White ... No color

28



TABLE 19 COLOR CODING AND ABBREVIATIONS FOR SPIRAL-WOUND GASKET MATERIALS (CONT'D)

Nonmetallic Filler Materials

Material Abbreviation Color Code

Chrysotile asbestos AS6 No stripe Polytetrafluoroethylene PTFE White stripe Mica-graphite Mfr.'s designation Pink stripe Flexible-graphite F.G. Gray stripe Ceramic CER Light green stripe

TABLE 20 EXAMPLE MARKINGS FOR SPIRAL-WOUND GASKETS ~~

Description Marking

NPS 3, Class 300 and 600 ASME 616.5 gasket having a Type 304 3-300/600-F.G. metal winding and a flexible graphite filler material (Manufacturer's trademark)

ASME 616.20

NPS 36, Class 300 ASME 616.47 Series A gasket having a Type 304 metal winding and a ceramic filler material

36-300"CER ASME 016.47 A (Manufacturer's trademark) ASME 616.20

NPS 12, Class 1500 ASME 616.5 gasket having an inconel metal 12-1500 INC 600-PTFE winding, PTFE filler material, and an inconel inner ring INC 600 I.R.

(Manufacturer's trademark) ASME B16.20

29


ASME B16.20-1998

Q

Clearance 0.06 in. 4


I L Gasket inside diameter

_I Bolt-hole diameter

Gasket outside diameter

TABLE 21 JACKETED GASKET DIMENSIONS FOR ASME B16.5 FLANGES

Flange Gasket Size Inside Gasket Outside Diameter by Class (11

W S ) Diameter (1) 150 300 400 (2) 600 900 (31 1500 2500 (4)

'12 0.88 1.75 2.00 . . . 2.00 ... 2.38 2.63 14 1.13 2.13 2.50 . . . 2.50 . . . 2.63 2.88

1 1.50 2.50 2.75 . . . 2.75 . . . 3.00 3.25 1 Y4 1.88 2.88 3.13 . . . 3.13 . . . 3.38 4.00 1 5; 2.13 3.25 3.63 . . . 3.63 . . . 3.75 4.50

2 2.88 4.00 4.25 . . . 4.25 . . . 5.50 5.63 2 51, 3.38 4.75 5.00 . . . 5.00 . . . 6.38 6.50 3 4.25 5.25 5.75 . . . 5.75 6.50 6.75 7.63 4 5.19 6.75 7.00 6.88 7.50 8.00 8.13 9.13 5 6.00 7.63 8.38 8.25 9.38 9.63 9.88 10.88

6 7.50 8.63 9.75 9.63 10.38 11.25 11.00 12.38 8 9.38 10.88 12.00 1 1.88 12.50 14.00 13.75 15.13

10 11.25 13.25 14.13 14.00 15.63 17.00 17.00 18.63 12 13.50 16.00 16.50 16.38 17.88 19.50 20.38 21.50 14 14.75 17.63 19.00 18.88 19.25 20.38 22.63 . . .

3

16 16.75 20.13 21.13 21 .o0 22.13 22.50 25.13 18 19.25 21.50 23.38 23.25 24.00 25.00 27.63 20 21.00 23.75 25.63 25.38 26.75 27.38 29.63 24 25.25 28.13 30.38 30.13 31 .O0 32.88 35.38 ...

. . .

...

...

GENERAL NOTE: The gasket-thickness tolerance is +0.03 in., -0.000 in. NOTES: (1) For gaskets NPS '/2 through NPS 24, the outside and inside diameter tolerances are +0.06 in., -0.000 in. (2) There are no Class 400 flanges NPS Y2 through NPS 3 (use Class 600). (3) There are no Class 900 flanges NPS through NPS 21/2 (use Class 1500). (4) There are no Class 2500 flanges NPS 14 and larger.

30



Clearance 0.06 in. -+ -

bolt hole

ASME 816.20-1998

"I thick

P- l L Gasket inside diameter

Bolt-hole b- Gasket outside diameter diameter

TABLE 22 JACKETED GASKET DIMENSIONS FOR ASME B16.47 SERIES A FLANGES

Flange Size

Gasket Inside Gasket Outside Diameter bv Class (1 1

26 26.50 30.38 32.75 32.63 34.00 34.63 28 28.50 32.63 35.25 35.00 35.88 37.13 30 30.50 34.63 37.38 37.13 38.13 32

39.63 32.50 36.88 39.50 39.38 40.13 42.13

34 34.50 38.88 41.50 41.38 42.13 44.63

36 36.50 41.13 43.88 43.88 44.38 47.13 38 38.50 43.63 41.38 42.13 43.38 47.13 40 40.50 45.63 43.75 44.25 45.38 49.13 42 42.50 47.88 45.75 46.25 47.88 51.13 44 44.50 50.13 47.88 48.38 49.88 53.75

46 46.50 52.13 50.00 50.63 52.13 56.38 48 48.50 54.38 52.00 52.88 54.63 58.38 50 50.50 56.38 54.13 55.13 56.88 ... 52 52.50 58.63 56.13 57.13 58.88 54 54.50 60.88 58.63 59.63 61.13 . . . 56 56.50 63.13 60.63 61.63 63.13 58 58.50 65.38 62.63 63.63 65.38 60

...

. . .

. . . 60.50 67.38 64.63 66.13 68.13 . . .

GENERAL NOTE: The gasket-thickness tolerance is +0.03 in., -0.000 in. NOTES: (1) For gaskets NPS 26 through NPS 60, the outside diameter and inside diameter tolerances

(2) There are no Class 900 flanges NPS 50 and larger. are +0.13 in., -0.000 in.

31


ASME B16.20-1998 METALLIC GASKETS FOR PIPE FLANGES

Q

Clearance 0.06 in. 1 L Gasket inside diameter

4 Bolt-hole k- Gasket outside diameter diameter

TABLE 23 JACKETED GASKET DIMENSIONS FOR ASME B16.47 SERIES B FLANGES

Flange Gasket Size Inside Gasket Outside Diameter by Class (1)

W S ) Diameter (1) 150 300 400 600 900 (2)

26 26.50 28.44 30.25 29.25 30.00 32.88 28 28.50 30.44 32.38 31-38 32.13 35.38 30 30.50 32.44 34.75 33.63 34.50 37.63 32 32.50 34.56 36.88 35.75 36.63 39.88 34 34.50 36.69 39.00 37.75 39.13 42.13

36 36.50 38.75 41.13 40.13 41.13 44.13

40 40.50 43.00 45.13 44.25 45.38 49.13 42 42.50 45.00 47.13 46.25 47.88 51.13 44 44.50 47.00 49.13 48.38 49.88 53.75

46 46.50 49.31 51.75 50.63 52.13 56.38 48 48.50 51.31 53.75 52.88 54.63 58.38 50 50.50 53.31 55.75 55.13 56.88 52 52.50 55.31 57.75 57.13 58.88 54 54.50 57.50 60.13 59.63 61.13

56 56.50 59.50 62.63 61.63. 63.13 58 58.50 62.06 65.06 63.63 65.38 60 60.50 64.06 67.06 66.13 68.13 . . .

~ ~~

38 38.50 41 .O0 43.13 42.13 43.38 47.13

...

...

...

...

. . .

GENERAL NOTE: The gasket-thickness tolerance is +0.03 in., -0.000 in. NOTES: (1) For gaskets NPS 26 through NPS 60, the outside diameter and inside diameter tolerances

are +0.13 in., -0.000 in. (2) There are no Class 900 flanges NPS 50 and larger.

32



TABLE 24 ABBREVIATIONS FOR IDENTIFYING MATERIALS FOR JACKETED GASKETS

ASME 816.20-1998

Material Abbreviation

AI CRS Cu Ni-Mo (grade 82) Ni-Mo-Cr (grade C-276) Ni-Cr-Fe (grade 600) Ni-Cr-Fe-Cb (grade 625) Ni-Fe-Cr (grade 800) Ni-Cr-Fe-Ti (grade X-750) Ni-Cu (grade 400) Nickel 200 Soft iron Ni-Cr Ta Ti

Metals

Aluminum AL Carbon steel CS Copper CU Hastelloy 6 HAST B Hastelloy C HAST C lnconel 600 INC 600 lnconel 625 INC 625 lncoloy 800 IN 800 lnconel X-750 INX Monel MON Nickel NI Soft iron Soft iron Stainless steels 3-digit Tantalum TANT Titanium TI

Fillers

Asbestos ASB Ceramic CER Flexible graphite F.G. Polytetrafluoroethylene PTFE

TABLE 25 EXAMPLE MARKINGS FOR JACKETED GASKETS

Description Marking

NPS 2'/2, Class 150 ASME 816.5 gasket having a Type 304 2'/2-150-304/F.G. metal jacket and a flexible graphite filler material (Manufacturer's trademark)

ASME 816.20

NPS 30, Class 300 ASME 616.47 Series B gasket having a 30-300-CSKER carbon-steel jacket and a ceramic filler material ASME 616.47 6

(Manufacturer's trademark) ASME 816.20

33


ASME B16.20-1998

MANDATORY ANNEX I REFERENCES

The following is a list of publications referenced in this Standard.

ASME B16.5-1996, Pipe Flanges and Flanged Fittings' ASME B 16.47- 1996, Large Diameter Steel Flanges:

ASME B36.1OM-1996, Welded and Seamless Wrought

ASME B36.19M-1985 (R1994), Stainless Steel Pipe'

Publisher: American Society of Mechanical Engineers (ASME), Three Park Ave., New York, NY 1001 6; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007

NPS 26 through NPS 60'

Steel Pipe'

IS0 9000-1: 1994, Quality management and quality assurance standards - Part 1 : Guidelines for selection and use

' May also be obtained from the American National Standards Institute (ANSI), I I West 42nd Street, New York. NY 10036.

IS0 9000-2: 1997, Quality management and quality assurance standards - Part 2: Generic guidelines for the application of IS0 9001, IS0 9002, and IS0 9003

IS0 9000-3: 1991, Quality management and quality assurance standards - Part 3: Guidelines for the application of IS0 9001 to the development, supply, installation, and maintenance of computer software

IS0 9001: 1994, Quality systems - Model for quality assurance in design, development, production, installation, and servicing

IS0 9002: 1994, Quality systems - Model for quality assurance in production, installation, and servicing

IS0 9003: 1994, Quality systems - Model for quality assurance in final inspection and test

Publisher: International Organization for Standardization (EO), I rue de Varembé, Case postale 56, CH-I 121 Genève 20, Switzerland/Suisse

API Specification 6A - 17th Edition - 1996, Specifi-

Publisher: American Petroleum Institute (API), 1220 L cation for Valves and Wellhead Equipment

Street, NW, Washington, DC 20005

35 Previous page is blank


ASME 816.20-1998

NONMANDATORY ANNEX A QUALITY SYSTEM PROGRAM

The products manufactured in accordance with this Standard shall be produced under a quality system program following the principles of an appropriate standard from the IS0 9000 series.’ A determination of the need for registration and/or certification of the product manufacturer’s quality system program by an independent organization shall be the responsibility of the manufacturer. Detailed documentation demonstrating program compliance shall be available to the purchaser at the manufacturer’s facility. A written, summarized description of the program used by the product manufacturer shall be available to the purchaser upon request. The product manufacturer is defined as the entity whose name or trademark appears on the product in accordance with the marking or identification requirements of this Standard.

’ The series is also available from the American National Standards Institute (ANSI) and the American Society for Quality (ASQ) as American National Standards that are identified by a prefix “Q’ replacing the prefix “ISO. Each standard of the series is listed in Annex I.

37 Previous page is blank


STDaASME BLb*ZO-ENLL L778 0757b70 ObLb775 75b W

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AMERICAN NATIONAL STANDARDS FOR PIPING. PIPE FLANGES. FITTLNGS. AND VALVES

Scheme for the Identification of Piping Systems ........................................................... .A13. 1-1996 Pipe Threads. General Purpose (Inch) ........................................................ .'. .... 61.20.1-1983(R1992) Dryseal Pipe Threads (Inch) ......................................................................... -61.20.3-1976(R1991) Cast Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250 ..................................... , .. .B16. 1.1998 Malleable Iron Threaded Fittings: Classes 150 and 300 ...................................................... .B16. 3.1998 Gray Iron Threaded Fittings: Classes 125 and 250 .......................................................... .B16. 4.1998 Pipe Flanges and Flanged Fittings (NPS Through NPS 24) ................................................ .616. 5.1996 Factory-Made Wrought Steel Buttwelding Fittings .......................................................... .B16. 9.1993 Face-to-Face and End-to-End Dimensions of Valves ....................................................... .B1 6.1 0.1992 Forged Fittings, Socket-Welding and Threaded ............................................................ .B16.1 1.1996 Cast Iron Threaded Drainage Fittings .................................................................... .B16.1 2.4998 Ferrous Pipe Plugs, Bushings, and Locknuts with Pipe Threads .............................................. .B16.1 4.1991 Cast Bronze Threaded Fittings: Classes 125 and 250 ................................................ .B16.1 5.1985(R1994) Cast Copper Alloy Solder Joint Pressure Fittings ................................................... .B16.1 8.1984(Rlg94) Metallic Gaskets for Pipe Flanges: Ring.Joint, Spiral.Wound. and Jacketed ............................ i ...... .B16.2 0.1998 Nonmetallic Flat Gaskets for Pipe Flanges ................................................................ .B16.2 1.1992 Wrought Copper and Copper Alloy Solder Joint Pressure Fittings ........................................... .B16.2 2.1995 Cast Copper Alloy Solder Joint Drainage Fittings - DWV .................................................. .616.2 3.1992 Cast Copper Alloy Pipe Flanges and Flanged Fittings: Classes 150, 300,400,600,900, 1500, and 2500 ... .B16.2 4.1991Wi1998) Buttwelding Ends ...................... i ............................................................... .616.2 5.1997 Cast Copper Alloy Fittings for Flared Copper Tubes ....................................................... .B16.2 6.1988 Wrought Steel Buttwelding Short Radius Elbows and Returns .............................................. .B16.2 8.1994 Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings - DWV .......................... .B16.2 9.1994 Manually Operated Metallic Gas Valves for Use in Gas Piping Systems up f o 125 psig

(Sizes 1/2 Through 2) ............................................................................... .616.3 3.1990 Valves - Flanged, Threaded. and Welding End ........................................................... .B16.3 4.1996 Orifice Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 616.36-1996 Large Metallic Valves for Gas Distribution (Manually Operated, NPS 2% to 12, 125 psig Maximum) ..... .B16.3 8.1985(R1994J Malleable Iron Threaded Pipe Unions ...................................................................... .B16.3 9.1998 Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems ............... .B16.4 0.1985(R1994) Ductile Iron Pipe Flanges and Flanged Fittings, Classes 150 and 300 ......................................... .B164 2.1998 Manually Operated Metallic Gas Valves for Use in House Piping Systems ................................... .B16.44 .1995 Cast Iron Fittings for Sovent* Drainage Systems .......................................................... .B16.4 5.1998 Large Diameter Steel Flanges (NPS 26 Through NPS 60) .................................................... .B16.4 7.1996 Steel Line Blanks ...................................................................................... .B16.48 .W97 Power Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631.1-1995 Fuel Gas Piping (not an ANSI standard) ................................................................... .B31. 2.1968 Process Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B31. 3.1999 Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids .................................. .B31. 4.1992 Refrigeration Piping ..................................................................................... .631. 5.1992 Gas Transmission and Distribution Piping Systems ......................................................... .B31. 8.1995 Building Services Piping ................................................................................. .631. 9.1996 Slurry Transportation Piping Systems .................................................................... .B31.1 1.1989 Manual for Determining the Remaining Strength of Corroded Pipelines ...................................... .B31 G.1991 Welded and Seamless Wrought Steel Pipe .............................................................. B36.10M-1996 Stainless Steel Pipe ............................................................................ 836.19M-l985(R1994) Self-operated and Power-Operated Safety-Related Valves Functional Specification Standard ............ .N278. 1.1975(R1992)

. . The ASME Publications Catalog shows a complete list of all the Standards published by the Society: For a complimentary

catalog. or the latest information about our publjcations. call 7-800-THE-ASME /1.800.843.2763) . . .


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