Ring Joint Gaskets

Ring Joint Gasket
A solid metal gasket that is softer than the mating flange material that is virtually ‘crushed’ into the flange face, creating a seal by filling imperfections and leak paths with gasket material. Under high sealing stress the gasket deforms but not the flange. They are used predominantly in the petrochemical industry (offshore oil platforms, refineries) due to the high service pressures required in their processes. Ring joint gaskets are machined to exact specifications and tight tolerances and come in a number of styles.

Ring Joint Gasket Styles
R        Oval or octagonal
RX     Self-energizing gasket
BX     Used in API spec 6A flanges

Materials
Common materials used for the manufacture of ring joint gaskets:
·Soft Iron
·Low Carbon Steel
·Stainless Steel
·Monel®
·Inconel®
·Incoloy®
·Hastelloy®

Hardness of Materials
On compression of the flange assembly, it is imperative that the ring joint gasket be significantly softer than the flange groove so that the gasket plastically deforms and not the groove. The use of harder ring joint gaskets can result in flange groove damage. For this reason, ring joint gaskets are supplied with the following maximum hardness values:

Material HB Max. HRB Max.
Soft Iron 90 56
Low Carbon Steel 120 68
5Cr1/2Mo 130 72
304 SS 160 83
316 SS 160 83
347 SS 160 83
410 SS 170 86
 
R Style Ring Joint Gaskets
The type R oval configuration is the original ring joint design followed by the type R octagonal. Both styles are interchangeable on the modern flat bottom groove, however only the oval style can be used in the old type round bottom groove. Style R ring type joints are designed to seal pressure up to 6,250 psi in accordance with ASME B16.5 pressure ratings and up to 5,000 psi in accordance with API 6A pressure ratings.

Nominal Pipe Size
1/2 – 24 inch
26 – 36 inch
26 – 36 inch
1-1/2 – 20 inch
 
Class and Standard
150 – 2500 ASME B16.5 and BS1560
300 – 600 MSS SP44 and BS3293
900 MSS SP44
API Spec. 6A
 
Tolerances

Series 'R' manufactured to the standards ASME B 16.20 - API Spec. 6A BS EN 12560-5
Dimensions in inch
Gasket Dimensions ANSI ANSI ANSI API ANSI API ANSI API ANSI
Ring No. Pitch Width Height W of Flat 150 300 600 2000# 900 3000# 1500 5000# 2500
Oval Oct Nominal Pipe Size
R11 1.344 0.250 0.440 0.380 0.170 1/2 1/2
R12 1.563 0.313 0.560 0.500 0.206 1/2 1/2
R13 1.688 0.313 0.560 0.500 0.206 3/4 3/4 1/2
R14 1.750 0.313 0.560 0.500 0.206 3/4 3/4
R15 1.875 0.313 0.560 0.500 0.206 1
R16 2.000 0.313 0.560 0.500 0.206 1 1 1 1 3/4
R17 2.250 0.313 0.560 0.500 0.206 1-1/4
R18 2.375 0.313 0.560 0.500 0.206 1-1/4 1-1/4 1-1/4 1-1/4 1
R19 2.563 0.313 0.560 0.500 0.206 1-1/2
R20* 2.688 0.313 0.560 0.500 0.206 1-1/2 1-1/2 1-1/2 1-1/2
R21 2.844 0.438 0.690 0.630 0.305 1-1/4
R22 3.250 0.313 0.560 0.500 0.206 2
R23* 3.250 0.438 0.690 0.630 0.305 2 2 2-1/16 1-1/2
R24* 3.750 0.438 0.690 0.630 0.305 2 2-1/16 2 2-1/16
R25 4.000 0.313 0.560 0.500 0.206 2-1/2
R26* 4.000 0.438 0.690 0.630 0.305 2-1/2 2-1/2 2-9/16 2
R27* 4.250 0.438 0.690 0.630 0.305 2-1/2 2-9/16 2-1/2 2-9/16
R28 4.375 0.500 0.750 0.690 0.341 2-1/2
R29 4.500 0.346 0.560 0.500 0.206 3
R30 4.625 0.438 0.690 0.630 0.305 3 3
R31* 4.875 0.438 0.690 0.630 0.305 3 3 3-1/8 3 3-1/8
R32 5.000 0.500 0.750 0.690 0.341 3
R33 5.188 0.313 0.560 0.500 0.206 3-1/2
R34 5.188 0.438 0.690 0.630 0.305 3-1/2 3-1/2
R35* 5.375 0.438 0.690 0.630 0.305 3 3-1/8
R36 5.875 0.313 0.560 0.500 0.206 4
R37* 5.875 0.438 0.690 0.630 0.305 4 4 4-1/16 4 4-1/16
R38 6.188 0.625 0.880 0.810 0.413 4
R39* 6.375 0.438 0.690 0.630 0.305 4 4-1/16
R40 6.750 0.313 0.560 0.500 0.206 5
R41* 7.125 0.438 0.690 0.630 0.305 5 5 5-1/8 5 5-1/8
R42 7.500 0.750 1.000 0.940 0.485 5
R43 7.625 0.313 0.560 0.500 0.206 6
R44* 7.625 0.438 0.690 0.630 0.305 5 5-1/8
R45* 8.313 0.438 0.690 0.630 0.305 6 6 7-1/16 6 7-1/16
R46* 8.313 0.500 0.750 0.690 0.341 6 7-1/16
R47* 9.000 0.750 1.000 0.940 0.485 6
R48 9.750 0.313 0.560 0.500 0.206 8
R49* 10.625 0.438 0.690 0.630 0.305 8 8 9 8 9
R50* 10.625 0.625 0.880 0.810 0.413 8 9
R51 11.000 0.875 1.130 1.060 0.583 8
R52 12.000 0.313 0.560 0.500 0.206 10
R53* 12.750 0.438 0.690 0.630 0.305 10 10 11 10 11
R54* 12.750 0.625 0.880 0.810 0.413 10 11
R55 13.500 1.125 1.440 1.380 0.780 10
R56 15.000 0.313 0.560 0.500 0.206 12
R57* 15.000 0.438 0.690 0.630 0.305 12 12 13-5/8 12 13-5/8
R58 15.000 0.875 1.130 1.060 0.583 12
R59 15.625 0.313 0.560 0.500 0.206 14
R60 16.000 1.250 1.560 1.500 0.879 12
R61 16.500 0.438 0.690 0.630 0.305 14 14
R62 16.500 0.625 0.880 0.810 0.413 14
R63* 16.500 1.000 1.310 1.250 0.681 14
R64 17.875 0.313 0.560 0.500 0.206 16
R65* 18.500 0.438 0.690 0.630 0.305 16 16 16-3/4
R66* 18.500 0.625 0.880 0.810 0.413 16 16-3/4
R67 18.500 1.125 1.440 1.380 0.780 16
R68 20.375 0.313 0.560 0.500 0.206 18
R69* 21.000 0.438 0.690 0.630 0.305 18 18
R70* 21.000 0.750 1.000 0.940 0.485 18
R71 21.000 1.125 1.440 1.380 0.780 18
R72 22.000 0.313 0.560 0.500 0.206 20
R73* 23.000 0.500 0.750 0.690 0.641 20 20 21-1/4
R74* 23.000 0.750 1.000 0.940 0.485 20 21-1/4
R75 23.000 1.250 1.560 1.500 0.879 20
R76 26.500 0.313 0.560 0.500 0.206 24
R77 27.250 0.625 0.880 0.810 0.413 24 24
R78 27.250 1.000 1.310 1.250 0.681 24
R79 27.250 1.375 1.750 1.630 0.977 24
R80 24.250 0.313 0.500 0.206 22
R81 25.000 0.563 0.750 0.377 22 22
R82* 2.250 0.438 0.630 0.305
R84* 2.500 0.438 0.630 0.305
R85* 3.125 0.500 0.690 0.341
R86* 3.563 0.625 0.810 0.413
R87* 3.938 0.625 0.810 0.413
R88* 4.875 0.750 0.940 0.485
R89* 4.500 0.750 0.940 0.485
R90* 6.125 0.875 1.060 0.583
R91* 10.250 1.250 1.500 0.879
R92 9.000 0.438 0.630 0.305
R93 29.500 0.750 0.690 0.940 0.485 26 26
R94 31.500 0.750 0.940 0.485 28 28
R95 33.750 0.750 0.940 0.485 30 30
R96 36.000 0.875 1.060 0.583 32 32
R97 38.000 0.875 1.060 0.583 34 34
R98 40.250 0.875 1.060 0.583 36 36
R99* 9.250 0.438 0.630 0.305
R100 29.500 1.125 1.380 0.780 26
R101 31.500 1.250 1.500 0.879 28
R102 33.750 1.250 1.500 0.879 30
R103 36.000 1.250 1.500 0.879 32
R104 38.000 1.375 1.630 0.977 34
R105 40.250 1.375 1.630 0.977 36
* Denotes API Spec 6A Ring Joint Gaskets

RX Style Ring Joint Gaskets
The Style RX ring type joint is manufactured in accordance with API 6A and ASME B16.20, to suit API 6B and ASME B16.5 flanges. The Style RX is designed to fit the modern flat bottom groove, and is interchangeable with the standard Style R ring type joint. However, since the Style RX is significantly taller than a Style R, larger flange make up distances will result. Style RX ring type joints are designed to seal pressures up to 6,250 psi in accordance with ASME B16.5 pressure ratings, and up to 5,000 psi in accordance with API 6A pressure ratings. Selected sizes incorporate a pressure passage hole to allow for pressure equalization each side of the sealing faces.

Nominal Pipe Size
1-1/2 – 20 inch
Class and Standard
720 – 5000 API 6B Flanges
Tolerances

A ---------------- + 0.008, - 0.000
H ---------------- + 0.008, - 0.000
OD -------------- + 0.010, - 0.000
C ---------------- + 0.006, - 0.000
D ---------------- + 0.000, - 0.030
E ----------------± 0.02
23o ------------ ± 1/2o

Series 'RX' manufactured to the standards ASME B 16.20 - API Spec. 6A
Dimensions in inch
Gasket Dimensions Class
Ring No. ID OD Height 2000 3000 5000
Nominal Pipe Size
RX20 2.313 3.000 0.750 1-1/2 1-1/2
RX23 2.672 3.672 1.000 2
RX24 3.234 4.172 1.000 2 2
RX25 3.625 4.313 0.750 3-1/8
RX26 3.469 4.406 1.000 2-1/2
RX27 3.719 4.656 1.000 2-1/2 2-1/2
RX31 4.359 5.297 1.000 3 3
RX35 4.859 5.797 1.000 3
RX37 5.359 6.297 1.000 4 4
RX39 5.859 6.797 1.000 4
RX41 6.609 7.547 1.000 5 5
RX44 7.109 8.047 1.000 5
RX45 7.797 8.734 1.000 6 6
RX46 7.688 8.75 1.125 6
RX47 8.094 9.656 1.625 8
RX49 10.109 11.047 1.000 8 8
RX50 9.844 11.156 1.250 8
RX53 12.234 13.172 1.000 10 10
RX54 11.969 13.281 1.250 10
RX57 14.484 15.422 1.000 12 12
RX63 15.266 17.391 2.000 14
RX65 17.984 18.922 1.000 16
RX66 17.719 19.031 1.250 16
RX69 20.484 21.422 1.000 18
RX70 20.094 21.656 1.625 18
RX73 22.406 23.469 1.250 20
RX74 22.094 23.656 1.625 20
RX99 8.734 9.672 1.000 8 8
RX201 1.573 2.026 0.445 1-3/8
RX205 2.016 2.453 0.437 1-13/16
RX210 3.094 3.844 0.750 2-9/16
RX215 4.609 5.547 1.000 4-1/16


BX Style Ring Joint Gasket
The Style BX ring type joint is manufactured in accordance with API 6A. All BX ring type joints incorporate a pressure passage hole to allow for pressure equalization each side of the sealing faces. On assembly, metal to metal contact of the flange faces is achieved. The Style BX is not interchangeable with any other style, and is only suited for API 6BX flanges. Style BX ring type joints are designed to seal pressure up to 20,000 psi in accordance with API 6A pressure ratings.

Nominal Pipe Size
1-11/16 – 21-1/4 inch
Class and Standard
5000 – 20000 API 6BX Flanges

Tolerances

A ---------------- + 0.008, - 0.000
H ---------------- + 0.008, - 0.000
D --------------- ± 0.02
OD -------------- + 0.000, - 0.005
ODT ----------- ± 0.002
C ---------------- + 0.006, - 0.000
23o ------------ ± 1/4o

Series 'BX' manufactured to the standards ASME B 16.20 - API Spec. 6A
Dimensions in inch
Gasket Dimensions Class
Ring No. ID OD Height 2000 3000 5000 10000 15000 20000
Nominal Pipe Size
BX151 2.250 3.008 0.379 1-13/16 1-13/16 1-13/16
BX152 2.528 3.334 0.403 2-1/16 2-1/16 2-1/16
BX153 3.078 3.974 0.448 2-9/16 2-9/16 2-9/16
BX154 3.624 4.600 0.488 3-1/16 3-1/16 3-1/16
BX155 4.705 5.825 0.560 4-1/16 4-1/16 4-1/16
BX156 7.901 9.637 0.733 7-1/16 7-1/16 7-1/16
BX157 9.941 11.593 0.826 9 9 9
BX158 12.038 13.890 0.911 11 11 11
BX159 14.776 16.800 1.012 13-5/8 13-5/8 13-5/8
BX160 14.768 15.850 0.938 13-5/8
BX162 17.600 18.720 0.560 16-3/4 16-3/4
BX163 20.528 21.896 1.185 18-3/4
BX164 20.527 22.463 1.185 18-3/4 18-3/4
BX165 23.139 24.595 1.261 21-1/4
BX166 23.140 25.198 1.261 21-1/4
BX167 28.864 29.896 1.412 26-3/4
BX168 28.864 30.138 1.412 26-3/4
BX169 5.813 6.831 0.624 5-1/8 5-1/8
BX303 32.237 33.573 1.494 30 30

Ordering Information
When ordering ring joint gaskets please specify the following:
·Gasket style and number
·Material
·Nominal pipe size and pressure rating or specific gasket dimensions if other than standard

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