Recommended Bolt Torque for Class 150 SPWD Gaskets with Inner Ring - Series A

Expired

Recommended minimum Bolt Torque Values for class 150 spiral wound gaskets with inner ring for Series A flanges.
Bolt Torque values are specified in ft-lb and N-m.
Bolt torques are based on design bolt stress of 60 ksi and a nut factor (K factor) of 0.18.

NPS
(in)		 Class 150 Bolt Torque
(ft-lb)		 Bolt Torque
(N-m)
No. of
Bolts		 Bolt
Size
(in)		 Min Max Min Max
26 24 1-1/4 312 1045 423.0 1416.8
28 28 1-1/4 287 1045 389.1 1416.8
30 28 1-1/4 307 1045 416.2 1416.8
32 28 1-1/2 434 1897 588.4 2572.0
34 32 1-1/2 402 1897 545.0 2572.0
36 32 1-1/2 504 1897 683.3 2572.0
38 32 1-1/2 531 1897 719.9 2572.0
40 36 1-1/2 496 1897 672.5 2572.0
42 36 1-1/2 559 1897 757.9 2572.0
44 40 1-1/2 566 1897 767.4 2572.0
46 40 1-1/2 591 1897 801.3 2572.0
48 44 1-1/2 560 1897 759.3 2572.0
50 44 1-3/4 724 3117 981.6 4226.1
52 44 1-3/4 752 3117 1019.6 4226.1
54 44 1-3/4 780 3117 1057.5 4226.1
56 48 1-3/4 741 3117 1004.7 4226.1
58 48 1-3/4 767 3117 1039.9 4226.1
60 52 1-3/4 731 3117 991.1 4226.1

1]  For typical calculation of bolt torque values refer to article: Calculation of Bolt Torque for Flanged Joint Assembly.

2]  Bolt Torque values provided in table above are for guidance only. For actual applied torque values follow gasket vendor recommendations.

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