- Category: Flange
- Category: Gasket
- Category: Valve
- Companies: Flange Company
- Datasheet: Flange Bolt Datasheet
Contents |
Torque Procedure
 |
 |
 |
 |
Start the tightening procedure by lubricating the nuts and bolts. Then hand tighten till they are snug against the flanges. If an air wrench is used make sure the pressure is set to the minimum. When tightening, always use the correct sequential bolt order for the flange.
4 and 8 Bolt Flanges
- First round - 30% of final torque (flange sequential order)
- Second round- 60% of final torque (flange sequential order)
- Third round - 100% of final torque (flange sequential order)
- One final time - clockwise or counter clockwise sequentially around the flange.
12 Bolt Flanges and More
- First round - 20% of final torque (flange sequential order)
- Second round - 40% of final torque (flange sequential order)
- Third round - 80% of final torque (flange sequential order)
- Fourth round - 100% of final torque (sequential order)
- One final time - clockwise or counter clockwise sequentially around the flange.
Torque Factor
| Pipe Size
(NPS) |
150#
(ft-lbs) |
300#
(ft-lbs) |
400#
(ft-lbs) |
600#
(ft-lbs) |
900#
(ft-lbs) |
1500#
(ft-lbs) |
2500#
(ft-lbs) |
|---|---|---|---|---|---|---|---|
| 1/2 | 45 | 45 | 45 | 45 | 150 | 150 | |
| 3/4 | 45 | 90 | 90 | 90 | 150 | 150 | |
| 1 | 45 | 90 | 90 | 90 | 240 | 240 | |
| 1 1/4 | |||||||
| 1 1/2 | 45 | 150 | 150 | 150 | 368 | 368 | |
| 2 | 90 | 90 | 90 | 90 | 240 | 240 | |
| 2 1/2 | 90 | 150 | 150 | 150 | 368 | 368 | |
| 3 | 90 | 150 | 150 | 150 | 240 | 533 | |
| 3 1/2 | |||||||
| 4 | 90 | 150 | 240 | 240 | 533 | 750 | |
| 5 | 150 | 150 | 240 | 368 | 750 | 1200 | |
| 6 | 150 | 150 | 240 | 368 | 533 | 1020 | |
| 8 | 150 | 240 | 368 | 533 | 1020 | 1650 | |
| 10 | 240 | 368 | 533 | 750 | 1020 | 3000 | |
| 12 | 240 | 533 | 750 | 750 | 1020 | 3300 | |
| 14 | 368 | 533 | 750 | 1020 | 1020 | 4770 | - |
| 16 | 368 | 750 | 1020 | 1020 | 1650 | 6600 | - |
| 18 | 533 | 750 | 1020 | 1650 | 3000 | 8800 | - |
| 20 | 533 | 750 | 1200 | 1650 | 3300 | 11580 | - |
| 22 | - | ||||||
| 24 | 750 | 1200 | 2250 | 3000 | 6600 | - |
4 Bolt Tightening Sequence
- Sequential Order: 1-2, 3-4
- Rotation Order: 1, 3, 2, 4
 |
8 Bolt Tightening Sequence
- Sequential Order: 1-2, 3-4, 5-6, 7-8
- Rotation Order: 1, 5, 3, 7, 2, 6, 4, 8
 |
12 Bolt Tightening Sequence
- Sequential Order: 1-2, 3-4, 5-6, 7-8, 9-10, 11-12
- Rotation Order: 1, 5, 9, 3, 7, 11, 2, 6, 10, 4, 8, 12
 |
16 Bolt Tightening Sequence
- Sequential Order: 1-2, 3-4, 5-6, 7-8, 9-10, 11-12, 13-14, 15-16
- Rotation Order: 1, 9, 5, 13, 3, 11, 7, 15, 2, 10, 6, 14, 4, 12, 8, 16
 |
20 Bolt Tightening Sequence
- Sequential Order: 1-2, 3-4, 5-6, 7-8, 9-10, 11-12, 13-14, 15-16, 17-18, 19-20
- Rotation Order: 1, 9, 5, 13, 3, 11, 7, 15, 2, 10, 6, 14, 4, 12, 8, 16
 |
24 Bolt Tightening Sequence
- Sequential Order: 1-2, 3-4, 5-6, 7-8, 9-10, 11-12, 13-14, 15-16, 17-18, 19-20, 21-22, 23-24
- Rotation Order: 1, 9, 17, 5, 13, 21, 3, 11, 19, 7, 15, 23, 2, 10, 18, 6, 14, 22, 20, 8, 16, 24
 |
