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Ring Joint Gaskets

 Ring Joint Gaskets

The oval cross section ring joint gasket was the first ring joint gasket initially standardized. Later developments resulted in other styles. If the RTJ flange was designed using the older version of the standard (round bottom groove), then it should be used only with oval ring joint gaskets. Octagonal section, for flat bottom flange grooves, is easier to install and its use is recommended for new applications. However either can be used with corresponding newer flat bottom grooves.

Style RX is a pressure-activated gasket. Its shape is designed to use the fluid pressure to increase the sealability. The outside sealing surface of the gasket makes the initial contact with the flange seating the gasket. As the internal pressure of the piping or equipment is increased, the contact pressure between gasket and flange also increases. High seating pressures are created increasing the sealability. This design characteristic makes this gasket style more resistant to vibrations, pressure surges and shocks that occur during oil well drilling. Style RX is interchangeable with oval and octagonal ring gaskets, using the same flange, if the flange groove is flat bottom.

Style BX gasket has a square cross section with beveled corners and is designed for use only in flanges API 6BX. Style BX is recommended for pressures from 5000 psi up to 20, 000 psi. The average diameter of the gasket is slightly greater than that of the flange groove. This way when the gasket is seated it stays pre-compressed by the outside diameter creating a high seating stress.

Ring joint gaskets are available in a wide range of materials, including exotic metals, depending on the application.
 

RTJ Material Hardness & Sizes

Material Hardness Conversion Scale
Material Hardness
Size Designations for Oval or Octagonal Rings
Dimensions for Oval or Octagonal Rings
RX Gaskets for API 6B Flanges
BX Gaskets for API 6BX Flanges

Material Hardness Conversion Scale

Rockwell "B"

Brinell 3000 Kg. Load

Rockwell "B"

Brinell 3000 Kg. Load

100

241

60

95

95

210

55

89

90

183

50

83

85

163

40

75

80

146

30

67

75

134

20

62

70

122

10

57

65

108

Material Hardness

Material

Designation

Maximum
Hardness
Rockwell B

Maximum
Hardness
Brinell

Soft Iron

D

56

90

Low Carbon Steel

S

68

120

4-6 Chrome

F-5*

72

130

304 Stainless Steel

S304

83

160

316 Stainless Steel

S316

83

160

347 Stainless Steel

S347

83

160

410 Stainless Steel

S410

86

170

Size Designations for Oval or Octagonal Rings

NominalPipe Size

Flange Pressure Rating

150#

300-600#

900#

1500#

2500#

1/2

-

R-11

R-12

R-12

R-13

3/4

-

R-13

R-14

R-14

R-16

1

R-15

R-16

R-16

R-16

R-18

1-1/4

R-17

R-18

R-18

R-18

R-21

1-1/2

R-19

R-20

R-20

R-20

R-23

2

R-22

R-23

R-24

R-24

R-26

2-1/2

R-25

R-26

R-27

R-27

R-28

3

R-29

R-31 (R-30 for lapped joint)

R-31

R-35

R-32

3-1/2

R-33

R-34

-

-

-

4

R-36

R-37

R-37

R-39

R-38

5

R-40

R-41

R-41

R-44

R-42

6

R-43

R-45

R-45

R-46

R-47

8

R-48

R-49

R-49

R-50

R-51

10

R-52

R-53

R-53

R-54

R-55

12

R-56

R-57

R-57

R-58

R-60

14

R-59

R-61

R-62

R-63

-

16

R-64

R-65

R-66

R-67

-

18

R-68

R-69

R-70

R-71

-

20

R-72

R73

R-74

R-75

-

22

R-80

R-81

-

-

-

24

R-76

R-77

R-78

R-79

-

26

-

R-93

R-100

-

-

28

-

R-94

R-101

-

-

30

-

R-95

R-102

-

-

32

-

R-96

R-103

-

-

34

-

R-97

R-104

-

-

36

-

R-98

R-105

-

-

* F5 identification designates ASTM Specification A-182 chemical composition requirements only.

Dimensions for Oval or Octagonal Rings

A.S.A. and
A.P.I.Ring
Number

Gasket Dimensions (Inches)

Gasket Weight lbs.

Center ToCenter

Inside Diameter

Outside Diameter

Width of Ring

Height of Ring

Oval

Octagonal

Oval Rings

Octagonal Rings

R11

1-11/32

1-3/32

1-19/32

1/4

7/16

3/8

0.111

0.104

R12

1-9/16

1-1/4

1-7/8

5/16

9/16

1/2

0.216

0.2

R13

1-11/16

1-3/8

2

5/16

9/16

1/2

0.234

0.216

R14

1-3/4

1-7/16

2-1/16

5/16

9/16

1/2

0.242

0.224

R15

1-7/8

1-9/16

2-3/16

5/16

9/16

1/2

0.26

0.24

R16

2

1-11/16

2-5/16

5/16

9/16

1/2

0.278

0.256

R17

2-1/4

1-15/16

2-9/16

5/16

9/16

1/2

0.311

0.288

R18

2-3/8

2-1/16

2-11/16

5/16

9/16

1/2

0.328

0.304

R19

2-9/16

2-1/4

2-7/8

5/16

9/16

1/2

0.354

0.328

R20

2-11/16

2-3/8

3

5/16

9/16

1/2

0.372

0.344

R21

2-27/32

2-13/32

3-9/32

7/16

11/16

5/8

0.66

0.643

R22

3-1/4

2-15/16

3-9/16

5/16

9/16

1/2

0.45

0.415

R23

3-1/4

2-13/16

3-11/16

7/16

11/16

5/8

0.755

0.734

R24

3-3/4

3-5/16

4-3/16

7/16

11/16

5/8

0.87

0.846

R25

4

3-11/16

4-5/16

5/16

9/16

1/2

0.553

0.51

R26

4

3-9/16

4-7/16

7/16

11/16

5/8

0.93

0.904

R27

4-1/4

3-13/16

4-11/16

7/16

11/16

5/8

1.05

0.96

R28

4-3/8

3-7/8

4-7/8

1/2

3/4

11/16

1.255

1.23

R29

4-1/2

4-3/16

4-13/16

5/16

9/16

1/2

0.622

0.575

R30

4-5/8

4-3/16

5-1/16

7/16

11/16

5/8

1.075

1.047

R31

4-7/8

4-7/16

5-5/16

7/16

11/16

5/8

1.13

1.1

R32

5

4-1/2

5-1/2

1/2

3/4

11/16

1.435

1.405

R33

5-3/16

4-7/8

5-1/2

5/16

9/16

1/2

0.718

0.664

R34

5-3/16

4-3/4

5-5/8

7/16

11/16

5/8

1.2

1.17

R35

5-3/8

4-15/16

5-13/16

7/16

11/16

5/8

1.25

1.21

R36

5-7/8

5-9/16

6-3/16

5/16

9/16

1/2

0.813

0.735

R37

5-7/8

5-7/16

6-5/16

7/16

11/16

5/8

1.36

1.33

R38

6-3/16

5-9/16

6-13/16

5/8

7/8

13/16

2.56

2.52

R39

6-3/8

5-15/16

6-13/16

7/16

11/16

5/8

1.48

1.44

R40

6-3/4

6-7/16

7-1/16

5/16

9/16

1/2

0.935

0.865

R41

7-1/8

6-11/16

7-9/16

7/16

11/16

5/8

1.66

1.61

R42

7-1/2

6-3/4

8-1/4

3/4

1

15/16

4.21

4.16

R43

7-5/8

7-5/16

7-15/16

5/16

9/16

1/2

1.055

0.975

R44

7-5/8

7-3/16

8-1/16

7/16

11/16

5/8

1.77

1.73

R45

8-5/16

7-7/8

8-3/4

7/16

11/16

5/8

1.93

1.88

R46

8-5/16

7-13/16

8-13/16

1/2

3/4

11/16

2.39

2.33

R47

9

8-1/4

9-3/4

3/4

1

15/16

5.06

4.99

R48

9-3/4

9-7/16

10-1/16

5/16

9/16

1/2

1.35

1.24

R49

10-5/8

10-3/16

11-1/16

7/16

11/16

5/8

2.47

2.4

R50

10-5/8

10

11-1/4

5/8

7/8

13/16

4.4

4.32

R51

11

10-1/8

11-7/8

7/8

1-1/8

1-1/16

8.05

8.17

R52

12

11-11/16

12-5/16

5/16

9-16

1/2

1.66

1.53

R53

12-3/4

12-5/16

13-3/16

7/16

11/16

5/8

3

2.88

R54

12-3/4

12-1/8

13-3/8

5/8

7/8

13/16

5.29

5.18

R55

13-1/2

12-3/8

14-5/8

1-1/8

1-7/16

1-3/8

16.23

17.08

R56

15

14-11/16

15-5/16

5/16

9/16

1/2

2.07

1.92

R57

15

14-9/16

15-7/16

7/16

11/16

5/8

3.48

3.38

R58

15

14-1/8

15-7/8

7/8

1-1/8

1-1/16

11

11.13

R59

15-5/8

15-5/16

15-15/16

5/16

9/16

1/2

2.16

2

R60

16

14-3/4

17-1/4

1-1/4

1-9/16

1-1/2

23.1

23.5

R61

16-1/2

16-1/16

16-15/16

7/16

11/16

5/8

3.83

3.73

R62

16-1/2

15-7/8

17-1/8

5/8

7/8

13/16

6.84

6.71

R63

16-1/2

15-1/2

17-1/2

1

1-5/16

1-1/4

16.20

16.67

R64

17-7/8

17-9/16

18-3/16

5/16

9/16

1/2

2.47

2.29

R65

18-1/2

18-1/16

18-15/16

7/16

11/16

5/8

4.3

4.18

R66

18-1/2

17-7/8

19-1/8

5/8

7/8

13/16

7.67

7.53

R67

18-1/2

17-3/8

19-5/8

1-1/8

1-7/16

1-3/8

22.3

23.4

R68

20-3/8

20-1/16

20-11/16

5/16

9/16

1/2

2.82

2.6

R69

21

20-9/16

21-7/16

7/16

11/16

5/8

4.87

4.74

R70

21

20-1/4

21-3/4

3/4

1

15/16

11.80

11.64

R71

21

19-7/8

22-1/8

1-1/8

1-7/16

1-3/8

25.2

26.5

R72

22

21-11/16

22-5/16

5/16

9/16

1/2

3.04

2.81

R73

23

22-1/2

23-1/2

1/2

3/4

11/16

6.6

6.47

R74

23

22-1/4

23-3/4

3/4

1

15/16

12.95

12.75

R75

23

21-3/4

24-1/4

1-1/4

1-9/16

1-1/2

33.3

35.3

R76

26-1/2

26-3/16

26-13/16

5/16

9/16

1/2

3.66

3.38

R77

27-1/4

26-5/8

27-7/8

5/8

7/8

13/16

11.3

11.1

R78

27-1/4

26-1/4

28-1/4

1

1-5/16

1-1/4

27.1

27.58

R79

27-1/4

25-7/8

28-5/8

1-3/8

1-3/4

1-5/8

48.7

49.75

R80

24-1/4

23-15/16

24-9/16

5/16

-

1/2

-

3.11

R81

25

24-7/16

25-9/16

9/16

-

3/4

-

8.55

R82

2-1/4

1-13/16

2-11/16

7/16

-

5/8

-

0.508

R84

2-1/2

2-1/16

2-15/16

7/16

-

5/8

-

0.564

R85

3-1/8

2-5/8

3-5/8

1/2

-

11/16

-

0.978

R86

3-9/16

2-15/16

4-3/16

5/8

-

13/16

-

1.447

R87

3-15/16

3-5/16

4-9/16

5/8

-

13/16

-

1.597

R88

4-7/8

4-1/8

5-5/8

3/4

-

15/16

-

2.735

R89

4-1/2

3-3/4

5-1/4

3/4

-

15/16

-

2.528

R90

6-1/8

5-1/4

7

7/8

-

1-1/16

-

4.55

R91

10-1/4

9

11-1/2

1-1/4

-

1-1/2

-

15.05

R92

9

8-9/16

9-7/16

7/16

11/16

5/8

2.07

2.02

R93

29-1/2

28-3/4

30-1/4

3/4

-

15/16

-

16.33

R94

31-1/2

30-3/4

32-1/4

3/4

-

15/16

-

17.44

R95

33-3/4

33

34-1/2

3/4

-

15/16

-

18.69

R96

36

35-1/8

36-7/8

7/8

-

1-1/16

-

26.65

R97

38

37-1/8

38-7/8

7/8

-

1-1/16

-

28.13

R98

40-1/4

29-3/8

41-1/8

7/8

-

1-1/16

-

29.79

R99

9-1/4

8-13/16

9-11/16

7/16

-

5/8

-

2.08

R100

R100 through R105. Information on request

RX Gaskets for API 6B Flanges

API Ring Number

Sizes of Flange (Inches)

Gasket Weight lbs.

720-960 2000lbs.

2900- lbs.

3000- lbs.

5000- lbs.

RX20

1-1/2

-

1-1/2

1-1/2

0.527

RX23

2

-

-

-

1.15

RX24

-

-

2

2

1.33

RX26

2-1/2

-

-

-

1.42

RX27

-

-

2-1/2

2-1/2

1.5

RX31

3

-

3

-

1.73

RX35

-

-

-

3

1.91

RX37

4

-

4

-

2.09

RX39

-

-

-

4

2.27

RX41

5

-

5

-

2.54

RX44

-

-

-

5

2.72

RX45

6

-

6

-

2.96

RX46

-

-

-

6

3.66

RX47

-

-

-

8*

8.56

RX49

8

-

8

-

3.79

RX50

-

-

-

8

5.36

RX53

10

-

10

-

4.56

RX54

-

-

-

10

6.45

RX57

12

-

12

-

5.36

RX63

-

-

-

14

26.4

RX65

16

-

-

-

6.63

RX66

-

-

16

-

9.39

RX69

18

-

-

-

7.52

RX70

-

-

18

-

20.14

RX73

20

-

-

-

11.63

RX74

-

-

20

-

22.1

RX82

-

1

-

-

0.79

RX84

-

1-1/2

-

-

0.88

RX85

-

2

-

-

0.88

RX86

-

2-1/2

-

-

1.79

RX87

-

3

-

-

1.98

RX88

-

4

-

-

3.22

RX89

-

3-1/2

-

-

2.98

RX90

-

5

-

-

6.82

RX91

-

10

-

-

17.1

RX99

-

-

8*

-

3.31

RX201

-

-

-

1-1/4

0.25

RX205

-

-

-

1-3/4

0.3

RX210

-

-

-

2-1/2

0.75

RX215

-

-

-

4

1.5

*Crossover flange connection.

BX Gaskets for API 6BX Flanges

API Ring Number

Nominal Flange Bore (Inches)

Gasket Weight lbs.

2,000 psi

3,000 psi

5,000 psi

10,000 psi

15,000 psi

20,000 psi

BX-150

-

-

-

1-11/16

1-11/16

-

0.295

BX-151

-

-

-

1-13/16

1-13/16

1-13/16

0.337

BX-152

-

-

-

2-1/16

2-1/16

2-1/16

0.425

BX-153

-

-

-

2-9/16

2-9/16

2-9/16

0.632

BX-154

-

-

-

3-1/16

3-1/16

3-1/16

0.875

BX-155

-

-

-

4-1/16

4-1/16

4-1/16

1.22

BX-156

-

-

-

7-1/16

7-1/16

7-1/16

4.14

BX-157

-

-

-

9

9

-

6.55

BX-158

-

-

-

11

11

-

9.6

BX-159

-

-

-

13-5/8

-

-

14.41

BX-160

-

-

13-5/8

-

-

-

6.75

BX-161

-

-

16-3/4

-

-

-

10.437

BX-162

-

-

16-3/4

-

-

-

4.375

BX-163

-

-

18-3/4

-

-

-

14.375

BX-164

-

-

-

-

-

-

21

BX-165

-

-

21-1/4

-

-

-

18.375

BX-166

-

-

-

-

-

-

27.5

BX-167

26-3/4

-

-

-

-

-

18

BX168

-

26-3/4

-

-

-

-

24.5

BX-169

-

5-1/8

-

-

-

-

-

BX-170

-

6-5/8

-

-

-

-

-

BX-171

-

8-9/16

-

-

-

-

-

BX-172

-

11-5/32

-

-

-

-

-

BX-303

-

30

-

-

-

-

-

top


Properties and application parameters shown throughout this datasheet are typical. Your specific application should not be undertaken without independent study and evaluation for suitability. For specific application recommendations consult BLAYLOCK GASKET & PACKING. Failure to select proper sealing products could result in property damage and/or serious personal injury. Specifications are subject to change without notice. This edition supersedes all previous issues.
 

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