Cathodic Insulation Kits: Bolt Torque
Recommended Torque Value
| Flange Rating: Class 150 |
|
Flange Rating: Class 300 |
NPS
Nominal
Pipe Size |
Bolt Size |
N° of Bolts |
Min. to Max.
Range in Foot Lbs.
(Lubricated) |
NPS
Nominal
Pipe Size |
Bolt Size |
N° of Bolts |
Min. to Max.
Range in Foot Lbs.
(Lubricated) |
| 2" |
5/8" |
4 |
80-90 |
2" |
5/8" |
8 |
80-90 |
| 3" |
5/8" |
4 |
80-90 |
3" |
3/4" |
8 |
140-160 |
| 4" |
5/8" |
8 |
80-90 |
4" |
3/4" |
8 |
140-160 |
| 6" |
3/4" |
8 |
140-160 |
6" |
3/4" |
12 |
140-160 |
| 8" |
3/4" |
8 |
140-160 |
8" |
7/8" |
12 |
240-270 |
| 10" |
7/8" |
12 |
240-270 |
10" |
1" |
16 |
360-400 |
| 12" |
7/8" |
12 |
240-270 |
12" |
1-1/8" |
16 |
360-400 |
| 14" |
1" |
12 |
360-400 |
14" |
1-1/8" |
20 |
520-570 |
| 16" |
1" |
16 |
360-400 |
16" |
1-1/4" |
20 |
740-800 |
| 18" |
1-1/8" |
16 |
520-570 |
18" |
1-1/4" |
24 |
740-800 |
| 20" |
1-1/8" |
20 |
520-570 |
20" |
1-1/4" |
24 |
740-800 |
| 24" |
1-1/4" |
20 |
740-800 |
24" |
1-1/2" |
24 |
1330-1400 |
| Flange Rating: Class 600 |
Flange Rating: Class 900 |
NPS
Nominal
Pipe Size |
Bolt Size |
N° of Bolts |
Min. to Max.
Range in Foot Lbs.
(Lubricated) |
NPS
Nominal
Pipe Size |
Bolt Size |
N° of Bolts |
Min. to Max.
Range in Foot Lbs.
(Lubricated) |
| 2" |
5/8" |
8 |
110-120 |
2" |
7/8" |
8 |
150-175 |
| 3" |
3/4" |
8 |
230-260 |
3" |
7/8" |
8 |
250-300 |
| 4" |
7/8" |
8 |
370-410 |
4" |
1-1/8" |
8 |
500-540 |
| 6" |
1" |
12 |
500-540 |
6" |
1-1/8" |
12 |
540-610 |
| 8" |
1-1/8" |
12 |
830-880 |
8" |
1-3/8" |
12 |
1000-1060 |
| 10" |
1-1/4" |
16 |
830-900 |
10" |
1-3/8" |
16 |
1000-1040 |
| 12" |
1-1/4" |
20 |
910-960 |
12" |
1-3/8" |
20 |
1040-1120 |
| Flange Rating: Class 1500 |
Tightening Sequence |
NPS
Nominal
Pipe Size |
Bolt Size |
N° of Bolts |
Min. to Max.
Range in Foot Lbs.
(Lubricated) |
|
2"
|
7/8" |
8 |
170-190 |
| 3" |
1-1/8" |
8 |
330-380 |
| 4" |
1-1/4" |
8 |
580-640 |
| 6" |
1-3/8" |
12 |
670-710 |
| 8" |
1-5/8" |
12 |
1170-1250 |
| 10" |
1-7/8" |
12 |
1830-1900 |
| 12" |
2" |
16 |
2000-2080 |
|
All technical advice and recommendation are rendered by Seller free of charge. While based on data believed to be reliable, seller assumes no responsibility.
Flange Working Pressures
CARBON STEEL PRESSURE-TEMPERATURE RATING
The pressure-temperature ratings shown below were taken from the 1977 edition of ANSI B16.5. All pressures are in pound per square inch gage (PSIG). When ratings below are used, consult the necessar code(s) to assure proper application of such ratings. These ratings are for material group 1.1 which includes A105 carbon steel.
Service Temperature
Deg F |
Working Pressures By Classes, PSIG Carbon Steel Pressure Temperature Ratings |
| 150 |
300 |
400 |
600 |
900 |
1500 |
2500 |
-20 to 100
200
300 |
285
260
230 |
740
675
655 |
990
900
875 |
1480
1350
1315 |
2220
2025
1970 |
3705
3375
3280 |
6170
5625
5470 |
400
500
600 |
200
170
140 |
635
600
550 |
845
800
730 |
1270
1200
1095 |
1900
1795
1640 |
3170
2995
2735 |
5280
4990
4560 |
650
700
750 |
125
110
95 |
535
535
505 |
715
710
670 |
1075
1065
1010 |
1610
1600
1510 |
2685
2665
2520 |
4475
4440
4200 |
800
850
900 |
80
60
50 |
410
270
170 |
550
355
230 |
825
535
345 |
1235
805
515 |
2060
1340
860 |
3430
2230
1430 |
950
1000 |
35
20 |
105
50 |
140
70 |
205
105 |
310
155 |
515
260 |
860
430 |
- Carbon steel flanges should not be used for applications requiring prolonged exposure to temperatures above 800°F due to the possibility of graphitization.
- When shock resulting from sudden stoppage of flow is expected, the shock pressure may be safely approximated by multiplying the velocity of flow through the line in feet per second by the factor 60. The sum of the normal line pressure plus the shock pressure thus calculated should be used to determine the appropriate pressure class of flange.
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