Recommended Bolt Torque Requirements for Class 150 Ring Type Joint Gaskets

Expired

Recommended minimum Torque Values are in N-m.
Torque values are applicable for Bolt Materials - ASTM A193 B7, B16 & ASTM A320 L7.

Bolt Torquing

BOLT TORQUING

Flange
NPS		 No of
Bolts		 Bolt
size		 Bolt Stress
(MPa)		 Torque N-m
μ=0.09
Copperslip		 Torque N-m
μ=0.14
Chesterton
Nickel		 Torque N-m
μ=0.225
Unlubricated
½'' 4 ½ 276 40 59 90
¾'' 4 ½ 276 40 59 90
1'' 4 ½ 276 40 59 90
1¼'' 4 ½ 276 40 59 90
1½'' 4 ½ 276 40 56 90
2'' 4 ⅝ 276 79 116 178
2½'' 4 ⅝ 276 79 116 178
3'' 4 ⅝ 276 79 116 178
4'' 8 ⅝ 276 79 116 178
5'' 8 ¾ 276 139 203 313
6'' 8 ¾ 276 139 203 313
8'' 8 ¾ 276 139 203 313
10'' 12 ⅞ 276 221 325 502
12'' 12 ⅞ 276 221 325 502
14'' 12 1 276 330 485 748
16'' 16 1 276 330 485 748
18'' 16 1 ⅛ 276 479 708 1098
20'' 20 1 ⅛ 276 479 708 1098
24'' 20 1 ¼ 276 668 992 1543
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