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FLANGE BOLT TORQUE
Tighten flange bolts using a diagonal pattern gradually increasing torque to the value indicated on the disc label or the chart shown below. Torque values are based upon ANSI standards for size and number of bolts and the use of clean, lubricated nut and bolt threads. The gasket used for these torque loadings has a 4400 "Y" value or minimum design seating stress.
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Disc Size ( Inches ) |
Torque (Ft./Lbs.) |
| For 150# ANSI Flanges |
| 1 |
10 |
| 1.5 |
15 |
| 2 |
25 |
| 2.5 |
30 |
| 3 |
35 |
| 4 |
25 |
| 6 |
40 |
| 8 |
50 |
| 10 |
45 |
| 12 |
45 |
| 14 |
75 |
| 16 |
55 |
| 18 |
60 |
| 20 |
70 |
| 24 |
85 |
| |
For 300# ANSI Flanges |
| 1 |
15 |
| 1.5 |
25 |
| 2 |
15 |
| 3 |
25 |
| 4 |
60 |
| 6 |
20 |
| 8 |
40 |
Improper installation can cause discs to break outside of specified burst pressure. Potential causes are:
- Misaligned flanges
- Excessive or uneven bolt torque
- Improper centering of disc
- Incorrect vent side gasket material or dimensions
- Discs with cracks or surface imperfections due to mishandling
Carbone of America Chemical Equipment Division 540 Branch Drive Salem, Va 24153
Phone: (800) 839-7535 (540) 389-7535 Fax: (540) 389-7538
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