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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
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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.
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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
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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
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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
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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
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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, toler- ances, 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.
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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.
hardness of 90 Brinell-56 Rockwell "B."
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 Dimensions and Tolerances
3.2.1 General. Dimensions and tolerances for spi- ral-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
METALLIC GASKETS FOR PIPE FLANGES
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 center- ing 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 accord- ance with Table 19. The inner ring shall be of a material
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METALLIC GASKETS FOR PIPE FLANGES
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
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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.
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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.
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STD.ASME BLb.20A-ENGL 2000 m 0757b70 ObL7b87 812 m
METALLIC GASKETS FOR PIPE FLANGES ASME B16.20a-2000
TABLE 14 INNER-RING INSIDE DIAMETERS FOR SPIRAL-WOUND (al GASKETS USED BETWEEN ASME 616.47 SERIES B FLANGES
Flange Size Pressure Class
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.
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STD-ASME BLb-ZOA-ENGL 2000 E D757b70 ObL7b88 757 m
ASME B16.20a-2000 METALLIC GASKETS FOR PIPE FLANGES
(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
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STDeASME BLb.20A-ENGL 2000 M 0759b70 Ob27689 h95 m
METALLIC GASKETS FOR PIPE FLANGES ASME B16.20a-2000
TABLE 18 MAXIMUM BORE OF ASME B16.47 SERIES B FLANGES FOR USE WITH SPIRAL-WOUND GASKETS
Flange Size Pressure Class
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.
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STD=ASME BLb.20A-ENGL 2000 B 0757b70 ObL?bSO 307
ASME B16.20a-2000 METALLIC GASKETS FOR PIPE FLANGES
(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
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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, instal- lation, 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
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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)
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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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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.
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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
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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
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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.
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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.
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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
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Mandatory Annex I References ........................................................................... 35
Nonmandatory Annex A Quality System Program .............................................................. 37
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ASME 816.20-1998
METALLIC GASKETS FOR PIPE FLANGES
Ring-Joint, Spiral-Wound, and Jacketed
1 SCOPE
1.1 General
This Standard covers materials, dimensions, toler- ances, 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
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 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.
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 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
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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.
hardness of 90 Brinell-56 Rockwell "B."
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 Dimensions and Tolerances
3.2.1 General. Dimensions and tolerances for spi- ral-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
METALLIC GASKETS FOR PIPE FLANGES
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 center- ing 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 (polytetra- fluoroethylene) 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 accord- ance 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.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
METALLIC GASKETS FOR PIPE FLANGES
3.4 Marking
3.4.1 General. The centering ring of each spiral- wound gasket shall be permanently marked. The let- tering height shall be a minimum of 0.1 in. The following information shall be included with the center- ing 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 applica- ble 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 thick- ness 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, includ- ing the density of the filler, shall be the gasket manufac- turer’s responsibility.
4.3 Dimensions and Tolerances
Gasket dimensions and tolerances shall be in accord- ance 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 applica- ble classes.
3
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 816.20-1998
23 deg
n
METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME BLb*E!U-ENGL
METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME B16.20-1998
23 deg
METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 616.20-1998 METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
METALLIC GASKETS FOR PIPE FLANGES ASME 616.20-1998
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 616.20-1998 METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
MET
ALLI
C G
ASKE
TS
FOR
PIPE
FL
ANG
ES
ASM
E B1
6.20
-199
8
I.5
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
.38
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
. .
. 1.
25
1.88
. .
. 1.
88
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
.81
13.3
8 12
.88
12.8
8 14
.63
14.2
5 14
.25
. . . . .
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
.63
13.3
8 12
.75
12.5
0 16
.13
14.2
5 . .
. 17
.75
2.13
.
2.63
_.
_ 2.
88
.,.
3.25
.
. 3.
75
. .
4.38
.
. 5.
13
5.88
.
7.13
7.
00
8.50
8.
38
4.38
5.13
5.
88
7.63
9.
50
. . .
6.63
8.
13
9.75
5.63
5.
75
6.50
6.
63
6.88
7.
75
8.25
9.
25
10.0
0 11
.oo
9.88
9.
75
10.5
0 11
.38
11.1
3 12
.13
12.0
0 12
.63
14.1
3 13
.88
14.2
5 14
.13
15.7
5 17
.13
17.1
3
16.6
3 16
.50
18.0
0 19
.63
20.5
0 19
.13
19.0
0 19
.38
20.5
0 22
.75
2.13
2.
63
2.88
3.
25
3.75
. . .
2.50
2.
75
3.13
3.
50
3.88
2.75
3.
00
3.38
4.
13
4.63
12.5
0 15
.25
18.7
5
21.6
3
16
18.2
5 18
.00
16.6
3 16
.63
16.2
5 16
.25
16.2
5 16
.00
. . .
20.2
5 21
.25
21.1
3 22
.25
22.6
3 25
.25
,..
18
20.7
5 20
.50
18,6
9 18
.69
18.5
0 18
-50
18.2
5 18
.25
. . .
21.6
3 23
.50
23.3
8 24
.13
25.1
3 27
.75
,..
20
22.7
5 22
.50
20.6
9 20
.69
20.5
0 20
.50
20.5
0 20
.25
___
23.8
8 25
.75
25.5
0 26
.88
27.5
0 29
.75
. . .
24
27.0
0 26
.75
24.7
5 24
.75
24.7
5 24
.75
24.7
5 24
.25
. . .
28.2
5 30
.50
30.2
5 31
.13
33.0
0 35
.50
. . .
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.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
.13
27.0
0 29
.00
34.7
5
28
28.5
0 29
.75
32.7
5 29
.00
31 .
oo
35.3
8 29
.00
31 .o
o 35
.13
29.0
0 31
.00
36.0
0 29
.00
31.0
0 37
.25
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
METALLIC GASKETS FOR PIPE FLANGES ASME 616.20-1998
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDDASME BLb-ZU-ENGL L998 m 0759b70 ObLbSbL 3bL
ASME 816.20-1998 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
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 816.20-1998 METALLIC GASKETS FOR PIPE FLANGES
TABLE 15 MINIMUM PIPE WALL THICKNESS SUITABLE FOR USE WITH INNER RINGS FOR ASME 616.5 FLANGES
Flange Pressure Class Size
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
ll bo
re,
if th
e ga
sket
an
d th
e fla
nges
ar
e as
sem
bled
co
ncen
trica
lly.
This
al
so
appl
ies
$,
to
a no
zzle.
It
is
the
user
’s re
spon
sibilit
y to
de
term
ine
if th
e ga
sket
is
sa
tisfa
ctor
y fo
r a
flang
e of
an
y lar
ger
bore
.
5
(3)
Gas
kets
in
thes
e siz
es
are
suita
ble
for
slip-
on
flang
es
only
if th
e ga
sket
s an
d fla
nges
ar
e as
sem
bled
co
ncen
trica
lly.
m
(4)
A no
zzle
is a
lo
ng
weld
ing
neck
; th
e bo
re
equa
ls th
e fla
nge
NPS.
s
(5)
An
NPS
24
gask
et
is s
uita
ble
for
nozz
les.
k 1,
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 816.20-1998 METALLIC GASKETS FOR PIPE FLANGES
TABLE 17 MAXIMUM BORE OF ASME 816.47 SERIES A FLANGES FOR USE WITH SPIRAL-WOUND GASKETS
Flange Pressure Class Size
(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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
METALLIC GASKETS FOR PIPE FLANGES ASME 816.20-1998
TABLE 18 MAXIMUM BORE OF ASME B16.47 SERIES B FLANGES FOR USE WITH SPIRAL-WOUND GASKETS
Flange Size Pressure Class
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
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ASME 816.20-1998 METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
METALLIC GASKETS FOR PIPE FLANGES ASME 616.20-1998
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
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ASME B16.20-1998
Q
Clearance 0.06 in. 4
METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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
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METALLIC GASKETS FOR PIPE FLANGES
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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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, instal- lation, 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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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 manufac- turer 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
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
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)
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