Recommended minimum Bolt Torque Values for class 600 spiral wound gaskets Series-B flanges without inner ring.
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 | 2226 | 1006.0 | 3018.1 |
| 28 | 28 | 1-3/4 | 744 | 2232 | 1008.7 | 3026.2 |
| 30 | 28 | 1-7/8 | 998 | 2994 | 1353.1 | 4059.3 |
| 32 | 28 | 2 | 1136 | 3408 | 1540.2 | 4620.6 |
| 34 | 24 | 2-1/4 | 1590 | 4771 | 2155.8 | 6468.6 |
| 36 | 28 | 2-1/4 | 1439 | 4317 | 1951.0 | 5853.1 |
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.