API Specification 6A / I S 0 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 ~ n ggaskets 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
a)
R and RX gaskets
Surface finish
All 23" surfaces on R and RX gaskets shall have a surface finish no rougher than 1,6 p m 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
a)
BX gaskets
Surface finish
All 23" surfaces on BX gaskets shall have a surface finish no rougher than 0,8 p m 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 ~ n ggaskets 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 / I S 0 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
Pitch
diameter
of ring
(groove)
Width
of ring
Height
of ring
oval
Height
of ring
octagonal
Width
of flat
of
octagonal
ring
Radius
in
octagonal
ring
P
A
B
H
+ 0,18
C
f 0,20
L 0,5
+ 0,5
+ 0,2
+ 0.5
68,28
82.55
95,25
101.60
107,95
7.95
11.13
11.13
11,13
11,13
14,3
17.5
17.5
17.5
17.5
12.7
15.9
15.9
15,9
15.9
5.23
7,75
7.75
7.75
7,75
K
R
R
R
31
35
37
39
R 41
123.03
136.53
149,23
161.93
180,98
11.13
11,13
11,13
11.13
11,13
17.5
17.5
17,5
17,5
17,5
15,9
15.9
15.9
15,9
15,9
R 44
R 45
R 46
R 47
K 19
193.68
211,15
211.15
228.60
269 88
11.13
11.13
12.70
19,05
11.13
17,5
17,5
19,l
25,4
17,5
R 50
R 53
R 54
R 57
269,88
323.85
323.85
381 .OO
15.88
11.13
15.88
11.13
22,4
17,5
22,4
17.5
H 23
R 24
R 26
li 27
E
RI
Width
of groove
F
Radius
in groove
Approx.
distance
between
made-up
flanges
R?
S
0,5
0
* 0,20
max.
1,5
1,5
1.5
1.5
1.5
6.4
7.9
7.9
7.9
7.9
8.74
11,91
11.91
11.91
11,91
0,8
0.8
0,8
0.8
0.8
4.1
4.8
4.8
4,8
4.8
7.75
7.75
7.75
7,75
7.75
1.5
1.5
1,5
1,5
1.5
7.9
7.9
7-9
7.9
7,9
11.91
11.91
11.91
11,91
11,91
0,8
0.8
03
0,8
0.8
4,8
4.8
4.8
4.8
4.8
15.9
15.9
17,5
23,9
15.9
7,75
7.75
8,66
12,32
7,75
1.5
1,5
1,5
1,5
1,5
7,9
7-9
9,7
12,7
7,9
11.91
11,91
13,49
19,84
11.91
0.8
08
1,5
1.5
0.8
4.8
4.8
4.8
4,l
4.8
20.6
15,9
20.6
15,9
10.49
7,75
10,49
7,79
1,5
1.5
1,5
1.5
11.2
7.9
11.2
7,9
16.66
11.91
16.66
11,91
1.5
D,8
1,5
0.8
4.1
4.8
4.1
4.8
(* 0.13)
R 20
Depth
of groove
+
API Specification 6A 1 I S 0 10423
Table 50 (continued)
Dimensions in millimetres
Ring
number
Pitch
diameter
of ring
(groove)
Width
of ring
Height
of ring
oval
Height
of ring
octagonal
Width
of flat
of
octagonal
ring
Radius
in
octagonal
ring
P
.4
H
H
C'
t- 0,18
10,20
k 0.5
f 0.5
+ 0,2
+ 0.5
33.3
17,5
22,4
17.5
25,4
31,8
15.9
23
1.5
1.5
1.5
19.1
20,6
15.9
23,9
17,5
17.30
7.75
10.49
7,75
12,32
8,66
(~1
0,13)
R 63
R 65
R 66
R 69
419.10
469.90
469.90
533.40
25,40
11,13
15.88
11,13
R 70
R 73
533.40
584.20
19.05
12.70
13 74
584,20
19,05
25,4
23.9
12.32
R 82
R 84
11.13
11,13
12,70
-
R 86
90,50
15,88
15.9
15.9
17.5
20,6
7,75
R 85
57.15
63,50
79,38
7,75
8.66
10.49
R 87
T i 88
ri 89
R 90
R 91
100,03
123.83
114.30
155.58
260 35
15.88
19.05
19,05
22,23
31.75
R 99
234,95
11.13
-
-
20.6
23.9
23,9
26,9
38.1
15.9
Depth
of groove
Width
of groove
E
4
+
0.5
0
16.0
F
+_
0.20
Radius
in groove
Approx.
distance
between
made-up
flanges
R7
S
max.
27.00
11.91
16,66
11.91
2.3
0.8
9.7
19,84
13,49
1,5
1,5
1,5
12,7
19,84
1,5
4.8
15
11.91
1,5
1.5
1,5
7,9
7,9
9.7
11,2
0,8
0,8
1,5
1.5
4.8
4,8
3.3
10,49
1,5
11,2
12,32
12.32
14,81
22.33
7.75
1,5
1.5
1,5
2.3
12.7
12,7
14.2
17.5
16.66
19,84
19.84
23.01
33.34
1.5
1.5
1.5
1.5
4.1
4.8
4.8
4,8
1,5
7,9
11.91
2.3
0,8
4,1
4.8
1,5
1.5
7,9
11,2
7,9
12,7
11.91
13,49
16,66
1,s
0.8
5.6
4.8
4.1
4.8
4.8
3,3
4,1
API Specification 6 A II S 0 10423
Table 51 -Type
RX pressure-energized ring gaskets (see Annex B for US Customary units)
23"
to"
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~onsin millimetres
Ring
number
Pitch
diameter
of ring
and
groove
Outside
diameter
of ring
Width
of ring
Width
of flat
Height
of
outside
bevel
Height
of ring
Radius
in ring
P
OD
C'
D
H
rf- 0,13
+ 0.5
+ 0.20
+ 0.15
o
+ 0.2
RX 20
HX 23
KX 24
68.26
82.55
95.25
76,20
93,27
105.97
4,62
6.45
6,45
1.5
1.5
1.5
101.60
101.60
107,95
109.55
111,91
118,26
6.45
6.45
3,18
4.24
4.24
3.18
4.24
4,24
19,05
25,40
25.40
RX 25
HX 26
RX 27
8.74
11.91
11.91
8,74
11,91
11,91
19.05
25.40
25,40
RX 31
RX 35
RX 37
RX 39
123.83
136.53
149,23
161,93
134.54
147.24
159.94
172,64
11,91
11,91
11.91
11,91
6.45
6,45
6,45
6.45
4,24
4,24
4,24
4.24
25,40
25.40
25,40
25,40
1,5
1,5
1,5
1.5
1,5
1.5
1.5
RX41
RX44
180,98
191.69
204,39
11.91
11.91
6.45
6.45
4,24
4,24
221.84
222.25
245.26
280.59
283.36
334.57
337,34
391.72
11.91
13,49
19,84
11,91
16,66
11,91
16.66
11,91
6,45
6.68
10,34
6,45
8.51
6,45
8.51
4.24
4,78
6.88
4,24
5.28
4.24
5,28
6,45
4,24
25,40
25,40
25,40
28.58
41,28
25.40
31,75
25.40
31,75
25,40
RX45
RX46
RX 47
KX 49
RX 50
RX 53
RX 54
RX 57
193,68
211,15
211.15
228.60
269.88
269.88
323,85
323,85
381,OO
4.62
- 0.8
Rl
f 0.5
1.5
1.5
1,5
1,5
2,3
1.5
1,5
1.5
1,5
1,5
Depth
of
groove
Width
of
groove
Radius
in
groove
Approx.
distance
between
mado-up
flanges
S
E
F
R,
:.5
& 0,20
max.
6.4
7,9
7,9
6.4
8,74
11.91
11,91
03
08
0,8
0.8
0.8
+
8.74
11.91
11.91
9.7
11,9
11,9
-
0,8
11.9
11.9
11,91
11,91
11,91
11.91
03
0.8
08
0.8
11.9
11.9
11.9
11.9
11.91
11,91
08
0.8
11,9
11,9
11.91
13.49
19.84
11,91
0,8
1.5
1,5
0,8
11,9
11,9
23.1
11.9
7.9
11,2
16.66
11,91
16,66
1,5
0.8
1.5
11,9
11.9
11,9
7.9
11,91
0.8
11.9
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
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 b e 1,5 mm for rings RX-82 through RX-85, 2,4 mm for
rings RX-86 and RX-87, and 3,Omm for rings RX-88 through RX-91.
Dimensions in millimetres
Ring
number
Pitch
diameter
of ring
and
groove
P
-t_
RX 63
RX 65
RX 66
RX 69
RX
HX
RX
RX
RX
RX
70
73
74
82
84
85
RX 86
RX87
RX 88
HX 89
RX 90
l<X 91
I<X 99
RX 201
RX 205
RX 210
RX 215
'
0.13
Outside
diameter
of ring
OD
+
Width
of flat
Height
of
outside
bevel
C
D
A
0.5
+
0.20
+
0.15
0
- 0.8
Height
of ring
H
+
Radius
in ring
Depth
of
groove
+ 0,5
+
li7
max.
2,3
0,8
13
08
1,5
1,5
1.5
0.8
0.8
13
21.3
11,9
11,9
11.9
18.3
15.0
18.3
11.9
11,9
9.7
1.5
13
13
13
13
2.3
0,8
0.8
0.5
0.8
08
9,7
9,7
9.7
9,7
18.3
19.1
11,9
14,78
6,451
8,51
6.45
10.34
6,68
10.34
6,45
6.45
6.68
8.46
4,24
5,28
4.24
6.88
5.28
6,88
4.24
4,24
4.24
50,80
25,40
31,75
25,40
41.28
31,75
41.28
25.40
25.40
25,40
2,3
1.5
13
13
2,3
1.5
2.3
1.5
13
13
16,O
7,9
11,2
7.9
12.7
9.7
12.7
7.9
7,9
9.7
27,OO
11,91
16,66
11.91
19.84
13,49
19.84
11.91
11,91
13,49
90,50
100,03
123,83
114.30
155,58
260.35
234.95
46,05
57.15
88.90
130,18
103,58
113.11
139,29
129,77
174.63
286.94
245,67
51,46
62,31
97.64
140,89
15,09
15.09
17,48
18,26
19.84
30.18
11.91
5,74
5.56
9,53
11,91
8,51
8,51
10,34
10,34
12,17
19,81
6.45
3.20
3,05
5.41
5.33
4.78
4.78
5,28
5,28
7.42
7,54
4.24
1,451
1,83
3.18
4,24
28,58
28.58
31,751
31,75
44,45
45,24
25.40
11.30
11.10
19,05
25,40
13
1.5
13
1.5
2.3
2,s
13
0,5 '
0.5 '
0.8 '
1.5'
11,2
11,2
12.7
12.7
14,2
17.5
7,9
4.1
4.1
6,4
7.9
16.66
16.66
19,84
19,84
23,02
33.34
11.91
5.56
5,56
9.53
11.91
_:,
.T
F
27,OO
11,91
16.66
11.91
19,84
13.49
19.84
11.91
11,91
13.49
IS
Approx.
distance
between
made-up
flanges
10.20
441,73
480,62
483,39
544.12
550.06
596.1 1
600.86
67.87
74,22
90,09
Tolerance on these dimensions
Radius
in
groove
$5
E
R1
0.2
Width
of
groove
419,lO
469,90
469.90
533,40
533.40
584.20
584.20
57.15
63,50
79,38
Tolerance on these dimensions is
"
Width
of ring
-
,8
i.
plus tolerance of 0.20 mm for wldth .-Iand he~ghtH I Spermitted, prov~dedthe variation in wldth or helght of any ring does not exceed 0 . 1 0 mm throughout
~ t sentlre c~rcurnference.
A P I Specification 6 A / I S 0 10423
Table 52 - Type BX pressure-energized ring gaskets (see A n n e x 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
Nominal
size
Outside
diameter
of ring
Of)
0
-0.15
BX 150
EX 151
EX 152
Height
of ring
Width
of ring
H~
+
070
Diameter
of flat
Width
of flat
OUT
1
C
0.20
+ 0,05
+
0.15
43
46
52
65
78
72.19
76.40
84,68
100,94
116.84
9.30
9.63
10.24
11,38
12,40
9,30
9.63
10,24
11.38
12.40
70.87
75.03
83.24
99,31
115,09
7.98
8,26
8.79
9,78
10,64
BX 157
BX 158
BX 159
103
179
228
279
346
147,96
237.92
294.46
352.04
426.72
14.22
18.62
20,98
23,14
25.70
14,22
18,62
20.98
23,14
25,70
145.95
235.28
291,49
348.77
423.09
160
161
162
163
RX 164
346
425
425
476
476
402.59
491,41
475.49
556,16
570.56
23,83
28,07
14.22
30.10
30.10
13.74
16,21
14.22
17.37
24,59
EX
RX
EX
BX
RX
165
166
167
168
169
540
540
680
680
130
624.71
640,03
759.36
765.25
173.51
32,03
32,03
35,87
35.87
15.85
BX
RX
BX
EX
170
171
172
303
228
279
346
762
218,03
267.44
333.07
852,75
14,22
14.22
14.22
37.95
EX 153
BX 154
EX 155
BX 156
RX
EX
BX
BX
Hole size
Depth
of groove
E
1)
i 0.5
Outside
diameter
of groove
1
0.5
0
C;
1
0.10
0
Width
of groove
,\'
+ 0.10
0
1,6
1.6
15
1.6
1.6
5,56
5,56
5.95
6.75
7.54
73.48
77.77
86.23
102.77
119.00
11.43
11.84
12,65
14,07
15.39
12,22
15,98
18,Ol
19.86
22.07
1,6
32
3.2
3.2
3.2
8,33
11,ll
12,70
14,29
15.88
150.62
241,83
299,06
357.23
432.64
17.73
23.39
26,39
29.18
32.49
399.21
487.45
473,48
551,89
566.29
10.36
12,24
12,22
13,ll
20,32
32
3.2
1.6
3.2
32
14,29
17,07
8.33
18.26
18.26
408.00
497.94
478,33
563,50
577.90
19.96
23.62
17.91
25.55
32,77
18.49
26,14
13,ll
16,05
12,93
620.19
635,51
754.28
760.17
171,27
13.97
21.62
8,03
10.97
10,69
32
3.2
1,6
1,6
1.6
19,05
19.05
21.43
21,43
9.53
632,56
647,88
768.33
774.22
176.66
27,20
34.87
22.91
25,86
16.92
14,22
14,22
14,22
16.97
216.03
265.43
331,06
847,37
12.22
12,22
12.22
11.61
1,6
1,6
1.6
1.6
8,33
8.33
8.33
22.62
220,88
270.28
335,92
862.30
17,91
17.91
17.91
27.38
A plus tolerance of 0.20 rnm for width A and height H is permitted, provided the variation in width or height of any ring does not exceed 0 , l O rnrn throughout
its entlre ctrcumference.