GLOBE VALVES OS & Y - FORGED - ISO 15761/API 602/B16.34
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
27
A P P E N D I X A
TABLE A
INDICATIVE IDEAL BONNET BOLTING (BOLTED BONNET) TORQUE (NM) UNC
STUD SIZE
Bolting Material
B7M/L7M
B7/B16/L7
B8/B8M CL.1
B8/B8M CL.2
3/8 - 16 UNC
25
35
16
27
7/16 - 14 UNC
34
41
30
34
1/2 - 13 UNC
60
68
44
61
9/16 - 12 UNC
76
90
75
88
5/8 - 11 UNC
115
130
95
115
3/4 - 10 UNC
215
260
170
203
7/8 - 9 UNC
300
345
230
271
1 - 8 UNC
475
520
298
475
TABLE B
INDICATIVE IDEAL BONNET BOLTING (BOLTED BONNET) TORQUE (NM) ISO
Material
M8
M10
M12
M14
M16
M20
Torque
Values
(Nm)
Ideal Max. Ideal Max. Ideal Max. Ideal Max. Ideal Max. Ideal Max.
B7
18
20
35
40
62
70
99
112
151
171
295
335
B7M
14
16
27
31
47
54
76
86
115
130
225
255
B8 CL.1
5
6
10
11
18
20
28
32
43
49
84
95
B8M
5
6
10
11
18
20
28
32
43
49
84
95
L7
18
20
35
40
62
70
99
112
151
171
295
335
L7M
14
16
27
31
47
54
76
86
115
130
225
255
B16
18
20
35
40
62
70
99
112
151
171
295
335
Note:
(1) Torque tolerance -10%, + 12%.
(2) For temperatures above 750°F (400°C) use 75% of the torque values.
(3) Above torque values are with the bolts lubricated.
(4) Values above are based on 30,000 psi (206.85 Mpa) bolting stress and lubricated with heavy graphite and oil mixture or a copper based
anti-seize grease.
(5) Do not exceed by more than 25% of values stated when emergency torquing is required.
(6) All bolts shall be torqued in the pattern as shown in Figure 10 on next page to ensure uniform gasket loading.
(7) Optimum torque can vary depending on type of body gasket but do not increase torque more than 10% above those shown.
(8) Consult us for other bolt material.
(9) Most B8M and B8 bolts are class 1 so do not assume class 2 unless you are sure.
Note
For ‘pressure seal’ bonnet consult APV for torques (where bolting is applicable). Bolt
tensions shown must be decreased by 25% when other or no lubrication used. Non
lubricated bolts can have an efficiency of less than 50% the torque of values stated.
Indicative torques are shown only, different body gasket systems, different sizes &
classes, etc., will have different torque requirements. Furthermore, other stud
grades can have much lower torques depending if class 1 or class 2 and or above
variables.
