Recommended minimum Bolt Torque Values for class 600 spiral wound gaskets with inner ring for Series B 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 600 | Bolt Torque (ft-lb) |
Bolt Torque (N-m) |
|||
|---|---|---|---|---|---|---|
| No. of Bolts |
Bolt Size (in) |
Min | Max | Min | Max | |
| 26 | 28 | 1-5/8 | 742 | 2457 | 1006.0 | 3331.2 |
| 28 | 28 | 1-3/4 | 744 | 2977 | 1008.7 | 4036.3 |
| 30 | 28 | 1-7/8 | 998 | 3887 | 1353.1 | 5270.1 |
| 32 | 28 | 2 | 1136 | 4544 | 1540.2 | 6160.8 |
| 34 | 24 | 2-1/4 | 1590 | 6362 | 2155.8 | 8625.7 |
| 36 | 28 | 2-1/4 | 1439 | 5756 | 1951.0 | 7804.1 |
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.