API Specification 6A - ? Â· API Specification 6A / IS0 10423 .A 10.4 Ring gaskets 10.4.1 General Types R and RX gaskets shall be used on 6B flanges. Only BX gaskets shall be used with 6BX flanges.

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  • API Specification 6A / IS0 10423

    .A

    10.4 Ring gaskets

    10.4.1 General

    Types R and RX gaskets shall be used on 6B flanges. Only BX gaskets shall be used with 6BX flanges. RX and BX gaskets provide a pressure-energized seal but are not interchangeable.

    10.4.2 Design

    10.4.2.1 Dimensions

    R~ng gaskets shall conform to the dimensions and tolerances specified in Tables 50*, 51* and 52* and shall be flat within a tolerance of 0,2 % of ring outside diameter to a maximum of 0,38 mm (0,015 in).

    10.4.2.2 R and RX gaskets - a) Surface finish

    All 23" surfaces on R and RX gaskets shall have a surface finish no rougher than 1,6 pm Ru (63 pin RMS).

    b) RX pressure-passage hole

    Certain size RX gaskets shall have one pressure-passage hole drilled through their height as shown in Table 51*.

    10.4.2.3 BX gaskets

    a) Surface finish

    All 23" surfaces on BX gaskets shall have a surface finish no rougher than 0,8 pm Ru (32 pin RMS).

    b) Pressure-passage hole

    Each BX gasket shall have one pressure-passage hole drilled through its height as shown in Table 52*

    10.4.2.4 Re-use of gaskets

    h

    R~ng gaskets have a limited amount of positive interference which assures the gaskets will be coined into seal~ng relationship in the grooves. These gaskets shall not be re-used.

    10.4.3 Materials

    a) Gasket material

    Gasket material shall conform to Clause 5.

    b) Coatings and platings

    Coatings and platings may be employed to aid seal engagement while minimizing galling, and to extend shelf life. Coating and plating thicknesses shall be 0,013 mm (0,000 5 in) maximum.

    10.4.4 Marking

    Gaskets shall be marked to conform with Clause 8.

    10.4.5 Storing and shipping

    Gaskets shall be stored and shipped in accordance with Clause 9.

  • API Specification 6A / IS0 10423

    Table 50 -Type R ring gaskets (see Annex B for US Customary units)

    a) Octagonal b) Oval c) Groove

    Dimensions in rnillimetres

    Ring number

    R 20 H 23 R 24 R 26

    li 27

    K 31

    R 35

    R 37

    R 39

    R 41

    R 44

    R 45

    R 46 R 47

    K 19

    R 50 R 53 R 54

    R 57

    Pitch diameter of ring

    (groove)

    P

    + 0,18 (* 0.13)

    68,28 82.55 95,25

    101.60

    107,95

    123.03

    136.53

    149,23

    161.93

    180,98

    193.68 211,15

    211.15

    228.60

    269 88

    269,88 323.85 323.85

    381 .OO

    Width of ring

    A

    f 0,20

    7.95 11.13 11.13 11,13

    11,13

    11.13

    11,13

    11,13

    11.13

    11,13

    11.13 11.13

    12.70

    19,05

    11.13

    15.88

    11.13 15.88

    11.13

    Height of ring

    oval

    B

    L 0,5

    14,3 17.5 17.5

    17.5

    17.5

    17.5

    17.5 17,5

    17,5

    17,5

    17,5

    17,5

    19,l 25,4

    17,5

    22,4 17,5 22,4

    17.5

    Width of groove

    F

    * 0,20

    8.74 11,91 11.91

    11.91

    11,91

    11.91

    11.91

    11.91

    11,91

    11,91

    11.91

    11,91

    13,49

    19,84 11.91

    16.66 11.91 16.66

    11,91

    Height of ring

    octagonal

    H

    + 0,5

    12.7

    15.9 15.9 15,9

    15.9

    15,9

    15.9

    15.9

    15,9

    15,9

    15.9 15.9

    17,5

    23,9

    15.9

    20.6 15,9 20.6

    15,9

    Radius in groove

    R? max.

    0,8 0.8 0,8 0.8

    0.8

    0,8

    0.8

    0 3

    0,8 0.8

    0.8

    08

    1,5

    1.5

    0.8

    1.5 D,8

    1,5

    0.8

    Approx. distance between made-up flanges

    S

    4.1

    4.8 4.8

    4,8 4.8

    4,8

    4.8 4.8

    4.8 4.8

    4.8 4.8

    4.8

    4,l

    4.8

    4.1 4.8

    4.1

    4.8

    Width of flat

    of octagonal

    ring

    C

    + 0,2

    5.23 7,75 7.75 7.75

    7,75

    7.75

    7.75

    7.75

    7,75

    7.75

    7,75

    7.75

    8,66

    12,32

    7,75

    10.49 7,75 10,49

    7,79

    Radius in

    octagonal ring

    RI + 0.5

    1,5 1,5 1.5

    1.5

    1.5

    1.5

    1.5

    1,5

    1,5

    1.5

    1.5

    1,5

    1,5

    1,5 1,5

    1,5 1.5

    1,5 1.5

    Depth of groove

    E + 0,5 0

    6.4 7.9 7.9 7.9

    7.9

    7.9

    7.9

    7-9

    7.9

    7,9

    7,9 7-9

    9,7 12,7

    7,9

    11.2

    7.9 11.2

    7,9

  • API Specification 6A 1 IS0 10423

    Table 50 (continued)

    Dimensions in millimetres

    Ring number

    R 63

    R 65

    R 66

    R 69

    R 70

    R 73

    13 74

    R 82

    R 84

    R 85

    R 86

    R 87

    T i 88

    r i 89 R 90

    R 91

    R 99

    Pitch diameter of ring

    (groove)

    P

    t- 0,18 ( ~ 1 0,13)

    419.10

    469.90

    469.90

    533.40

    533.40

    584.20

    584,20

    57.15

    63,50

    79,38

    90,50

    100,03

    123.83

    114.30

    155.58

    260 35

    234,95

    Width of ring

    .4

    10,20

    25,40

    11,13

    15.88

    11,13

    19.05

    12.70

    19,05

    11.13

    11,13

    12,70

    15,88

    15.88

    19.05

    19,05

    22,23

    31.75

    11.13

    Height of ring

    oval

    H

    k 0.5

    33.3

    17,5

    22,4

    17.5

    25,4

    19.1

    25,4 - - - -

    - - - - -

    -

    Height of ring

    octagonal

    H

    f 0.5

    31,8

    15.9

    20,6

    15.9

    23,9

    17,5

    23.9

    15.9

    15.9

    17.5

    20,6

    20.6

    23.9

    23,9

    26,9 38.1

    15.9

    Width of flat

    of octagonal

    ring

    C'

    + 0,2

    17.30

    7.75

    10.49

    7,75

    12,32

    8,66

    12.32

    7,75

    7,75

    8.66

    10.49

    10,49

    12,32

    12.32

    14,81

    22.33

    7.75

    Radius in

    octagonal ring

    4 + 0.5

    2 3

    1.5

    1.5

    1.5

    1,5

    1.5

    1,5

    1 5

    1,5

    1.5

    1,5

    1,5

    1,5

    1.5

    1,5 2.3

    1,5

    Radius in groove

    R7

    max.

    2.3

    0.8

    1,s

    0.8

    1,5

    1,5

    1,5

    0,8

    0,8

    1,5

    1.5

    1.5

    1.5

    1.5

    1.5

    2.3

    0,8

    Approx. distance between made-up flanges

    S

    5.6

    4.8

    4.1

    4.8

    4.8

    3,3

    4.8

    4.8

    4,8

    3.3

    4,1

    4.1

    4.8

    4.8

    4,8

    4,1

    4.8

    Depth of groove

    E

    + 0.5 0

    16.0

    7,9 11,2

    7,9 12,7

    9.7

    12,7

    7,9

    7,9

    9.7 11,2

    11,2

    12.7

    12,7

    14.2

    17.5

    7,9

    Width of groove

    F

    +_ 0.20

    27.00

    11.91

    16,66

    11.91

    19,84

    13,49

    19,84

    11.91

    11.91

    13,49

    16,66

    16.66

    19,84

    19.84

    23.01

    33.34

    11.91

  • API Specification 6A I I S 0 10423

    Table 51 -Type RX pressure-energized ring gaskets (see Annex B for US Customary units)

    23" t o " 30'

    a The pressure-passage hole illustrated in the RX ring cross-section applies to rings RX-82 through RX-91 only. Centreline of hole shall be located at midpoint of dimension C. Hole diameter shall be 1,5 mm for rings RX-82 through RX-85, 2,4 mm for rings RX-86 and RX-87, and 3,O mm for rings RX-88 through RX-91.

    Dimens~ons in millimetres

    Ring number

    RX 20

    HX 23

    KX 24

    RX 25

    HX 26

    RX 27

    RX 31

    RX 35

    RX 37

    RX 39

    RX41

    RX44

    RX45

    RX46

    RX 47

    KX 49

    RX 50

    RX 53

    RX 54

    RX 57

    Pitch diameter of ring

    and groove

    P

    rf- 0,13

    68.26

    82.55

    95.25

    101.60

    101.60

    107,95

    123.83

    136.53

    149,23

    161,93

    180,98

    193,68

    211,15

    211.15

    228.60

    269.88

    269.88

    323,85

    323,85

    381,OO

    Outside diameter of ring

    OD + 0.5

    76,20

    93,27

    105.97

    109.55

    111,91

    118,26

    134.54

    147.24

    159.94

    172,64

    191.69

    204,39

    221.84

    222.25

    245.26

    280.59

    283.36 334.57

    337,34

    391.72

    Width of ring

    + 0.20

    8.74

    11.91

    11.91

    8,74

    11,91

    11,91

    11,91

    11,91

    11.91

    11,91

    11.91

    11.91

    11.91

    13,49

    19,84

    11,91

    16,66

    11,91

    16.66

    11,91

    Width of flat

    C' + 0.15

    4,62

    6.45

    6,45

    4.62

    6.45

    6.45

    6.45 6,45

    6,45

    6.45

    6.45

    6.45

    6,45

    6.68

    10,34

    6,45

    8.51

    6,45

    8.51

    6,45

    Height of

    outside bevel

    D o

    - 0.8

    3,18 4.24

    4.24

    3.18

    4.24

    4,24

    4,24

    4,24

    4,24

    4.24

    4,24

    4,24

    4.24

    4,78

    6.88

    4,24

    5.28

    4.24

    5,28

    4,24

    Height of ring

    H + 0.2

    19,05

    25,40

    25.40

    19.05

    25.40

    25,40

    25,40

    25.40

    25,40

    25,40

    25,40

    25,40

    25,40

    28.58

    41,28

    25.40

    31,75

    25.40

    31,75

    25,40

    Depth of

    groove

    E

    + :.5

    6.4 7,9

    7,9

    6.4

    7,9

    7,9

    7.9

    7.9

    7.9

    7,9

    7,9

    7,9

    7.9

    9,7 12.7

    7.9 11.2

    7.9 11,2

    7.9

    Radius in ring

    R l

    f 0.5

    1.5

    1.5

    1.5

    1,5

    1,5

    1,5

    1.5

    1,5 1.5

    1.5

    1.5

    1.5

    1,5

    1,5

    2,3

    1.5

    1,5 1.5

    1,5

    1,5

    Width of

    groove

    F

    & 0,20

    8,74

    11.91

    11,91

    8.74

    11.91

    11.91

    11,91

    11,91

    11,91

    11.91

    11.91

    11,91

    11.91

    13.49

    19.84

    11,91

    16.66

    11,91

    16,66

    11,91

    Radius in

    groove

    R, max.

    0 3

    0 8

    0,8

    0.8

    0.8

    0,8

    0 3

    0.8

    0 8

    0.8

    0 8

    0.8

    0,8

    1.5

    1,5

    0,8

    1,5 0.8

    1.5

    0.8

    Approx. distance between mado-up flanges

    S

    9.7 11,9

    11,9 -

    11.9

    11.9

    11.9

    11.9

    11.9

    11.9

    11,9

    11,9

    11,9

    11,9

    23.1

    11.9

    11,9

    11.9

    11,9

    11.9

  • API Specification 6A I I S 0 10423

    Table 51 (continued)

    23" t o " 30'

    a The pressure-passage hole illustrated in the RX ring cross-section applies to rings RX-82 through RX-91 only. Centreline of hole shall be located at midpoint of dimension C. Hole diameter shall be 1,5 mm for rings RX-82 through RX-85, 2,4 mm for rings RX-86 and RX-87, and 3,O mm for rings RX-88 through RX-91.

    Dimensions in millimetres

    Ring number

    RX 63 RX 65

    RX 66

    RX 69

    RX 70

    HX 73 RX 74

    RX 82 RX 84

    RX 85

    RX 86

    RX87

    RX 88 HX 89

    RX 90 l

  • API Specification 6 A / I S 0 10423

    Table 52 - Type BX pressure-energized ring gaskets (see Annex B for U S Customary units) Dimensions in millimetres

    Radius R shall be 8 % to 12 % of the gasket height H. One pressure-passage hole required per gasket on centrellne

    a Break sharp corner on inside diameter of groove. Dimensions in rnillirnetres

    Ring number

    BX 150 EX 151 EX 152

    EX 153

    BX 154

    EX 155 BX 156

    BX 157

    BX 158 BX 159

    RX 160 EX 161

    BX 162

    BX 163

    RX 164

    EX 165

    RX 166 EX 167 BX 168 RX 169

    BX 170 RX 171

    BX 172 EX 303

    A plus its entlre

    Nominal size

    43

    46 52

    65

    78

    103 179

    228

    279 346

    346 425

    425

    476 476

    540

    540 680

    680 130

    228 279

    346 762

    tolerance of 0.20 ctrcumference.

    Outside diameter of ring

    Of) 0

    -0.15

    72.19

    76.40

    84,68 100,94

    116.84

    147,96 237.92

    294.46

    352.04 426.72

    402.59 491,41

    475.49

    556,16 570.56

    624.71

    640,03 759.36 765.25 173.51

    218,03

    267.44 333.07 852,75

    rnm for width

    Outside diameter of groove

    C; 1 0.10

    0

    73.48 77.77

    86.23 102.77

    119.00

    150.62 241,83

    299,06

    357.23 432.64

    408.00 497.94

    478,33 563,50

    577.90

    632,56 647,88

    768.33 774.22 176.66

    220,88 270.28

    335,92

    862.30

    exceed 0 , lO

    Height of ring

    H~ + 070

    9.30 9.63

    10.24

    11,38

    12,40

    14.22

    18.62

    20,98

    23,14 25.70

    23,83 28,07

    14.22

    30.10

    30.10

    32,03

    32,03 35,87 35.87 15.85

    14,22 14.22

    14.22 37.95

    A and height H

    Width of groove

    ,\'

    + 0.10 0

    11.43

    11.84 12,65

    14,07 15.39

    17.73

    23.39

    26,39

    29.18 32.49

    19.96

    23.62

    17.91 25.55

    32,77

    27,20

    34.87 22.91 25,86

    16.92

    17,91 17.91

    17.91

    27.38

    rnrn throughout

    Width of ring

    1 0.20

    9,30 9.63 10,24

    11.38

    12.40

    14,22

    18,62

    20.98

    23,14 25,70

    13.74 16,21

    14.22 17.37

    24,59

    18.49 26,14 13, l l 16,05

    12,93

    14,22

    14,22 14,22 16.97

    is permitted,

    Diameter of flat

    OUT

    + 0,05 70.87

    75.03

    83.24

    99,31 115,09

    145.95

    235.28

    291,49

    348.77

    423.09

    399.21

    487.45

    473,48

    551,89

    566.29

    620.19 635,51 754.28 760.17 171,27

    216.03 265.43 331,06

    847,37

    provided the

    Width of flat

    C + 0.15

    7.98 8,26

    8.79

    9,78

    10,64

    12,22

    15,98

    18,Ol

    19.86 22.07

    10.36 12,24

    12,22

    13, l l

    20,32

    13.97 21.62

    8,03 10.97 10,69

    12.22

    12,22 12.22 11.61

    variation in width

    Hole size

    1)

    i 0.5

    1,6 1.6 1 5

    1.6 1.6

    1,6

    3 2

    3.2 3.2

    3.2

    3 2

    3.2 1.6

    3.2

    3 2

    3 2 3.2

    1,6 1,6 1.6

    1,6 1,6

    1.6

    1.6

    or height of any

    Depth of groove

    E 1 0.5

    0

    5,56 5,56

    5.95

    6.75 7.54

    8,33 11 , l l

    12,70

    14,29 15.88

    14,29

    17,07

    8.33

    18.26 18.26

    19,05 19.05 21.43

    21,43

    9.53

    8,33 8.33

    8.33 22.62

    ring does not

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