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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<X 91 I<X 99
RX 201
RX 205 RX 210 RX 215
Tolerance
' Tolerance on these dimensions IS i. " plus tolerance of 0.20 mm for wldth .-I and he~ght HIS permitted, prov~ded the variation in wldth or helght of any ring does not exceed 0.10 mm throughout ~ ts entlre c~rcurnference.
Pitch diameter of ring
and groove
P
-t_ 0.13
419,lO 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
46,05
57.15 88.90 130,18
on these
Outside diameter of ring
OD + 0.5
441,73 480,62
483,39
544.12
550.06
596.1 1
600.86
67.87 74,22
90,09
103,58 113.11 139,29
129,77
174.63 286.94 245,67
51,46
62,31 97.64 140,89
dimensions is
Width of ring
A + 0.20
27,OO 11,91 16.66
11.91 19,84
13.49
19.84 11.91 11,91
13.49
15,09
15.09 17,48
18,26 19.84
30.18 11.91 5,74
5.56
9,53 11,91
_:, ,8
Radius in
groove
li7
max.
2,3
0,8 1 3
0 8
1,5
1,5 1.5 0.8
0.8
1 3
1.5
1 3
1 3 1 3 1 3 2.3
0,8 0.8
0.5
0.8
0 8
Approx. distance between made-up flanges
.T
21.3 11,9 11,9
11.9
18.3 15.0
18.3 11.9
11,9
9.7
9,7 9,7
9.7 9,7 18.3 19.1 11,9 - - - -
Width of flat
C + 0.15
14,78
6,451 8,51
6.45
10.34 6,68
10.34 6,45
6.45 6.68
8,51
8,51
10,34 10,34 12,17
19,81 6.45
3.20 3,05
5.41 5.33
Height of
outside bevel
D 0
- 0.8
8.46 4,24
5,28
4.24
6.88
5.28
6,88
4.24 4,24
4.24
4.78
4.78
5,28
5,28 7.42
7,54
4.24 1,451
1,83 3.18 4,24
Height of ring
H + 0.2
50,80
25,40 31,75
25,40
41.28
31,75 41.28
25.40 25.40
25,40
28,58 28.58
31,751
31,75 44,45 45,24
25.40
11.30 11.10
19,05 25,40
Radius in ring
R 1
+ 0,5
2,3 1.5
1 3
1 3
2,3 1.5
2.3
1.5 1 3
1 3
1 3 1.5
1 3
1.5 2.3
2,s
1 3 0,5 ' 0.5 ' 0.8 ' 1.5'
Depth of
groove
E
+ $5
16,O
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 4.1 4.1
6,4 7.9
Width of
groove
F
10.20
27,OO 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 23,02
33.34 11.91 5.56
5,56
9.53 11.91
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