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

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