Bursting Internal Pressure Collapsing External Pressure Values
Nominal Size
(inches) |
Schedule Number |
Outside Diameter
(inches) |
Wall Thickness
(inches) |
Inside Diameter
(inches) |
Bursting Internal Pressure
(psi) |
Collapsing External Pressure
(psi) |
| 1/8 |
10 |
0.405 |
0.049 |
0.307 |
18,150 |
7,468 |
| 40 |
0.405 |
0.068 |
0.269 |
25,195 |
10,761 |
| 80 |
0.405 |
0.095 |
0.215 |
35,185 |
15,441 |
| 1/4 |
10 |
0.540 |
0.065 |
0.410 |
18,055 |
7,425 |
| 40 |
0.540 |
0.088 |
0.364 |
24,444 |
10,415 |
| 80 |
0.540 |
0.119 |
0.302 |
33,055 |
14,445 |
| 3/8 |
10 |
0.678 |
0.065 |
0.545 |
14,380 |
5,705 |
| 40 |
0.678 |
0.091 |
0.493 |
20,132 |
8,397 |
| 80 |
0.678 |
0.126 |
0.423 |
27,876 |
12,021 |
| 1/2 |
5 |
0.840 |
0.065 |
0.710 |
11,607 |
4,407 |
| 10 |
0.840 |
0.083 |
0.674 |
14,821 |
5,911 |
| 40 |
0.840 |
0.109 |
0.622 |
19,464 |
8,084 |
| 80 |
0.840 |
0.147 |
0.546 |
26,250 |
11,260 |
| 3/4 |
5 |
1.050 |
0.065 |
0.920 |
9,285 |
3,295 |
| 10 |
1.050 |
0.083 |
0.884 |
11,857 |
4,524 |
| 40 |
1.050 |
0.113 |
0.824 |
16,142 |
6,529 |
| 80 |
1.050 |
0.154 |
0.742 |
22,000 |
9,271 |
| 1 |
5 |
1.315 |
0.065 |
1.185 |
7,414 |
2,445 |
| 10 |
1.315 |
0.109 |
1.097 |
12,433 |
3,795 |
| 40 |
1.315 |
0.133 |
1.049 |
15,171 |
6,075 |
| 80 |
1.315 |
0.179 |
0.957 |
20,418 |
8,530 |
| 1 1/4 |
5 |
1.660 |
0.065 |
1.530 |
5,873 |
1,725 |
| 10 |
1.660 |
0.109 |
1.442 |
9,849 |
3,585 |
| 40 |
1.660 |
0.140 |
1.380 |
12,650 |
3,895 |
| 80 |
1.660 |
0.191 |
1.278 |
17,259 |
7,052 |
| 1 1/2 |
5 |
1.900 |
0.065 |
1.770 |
5,131 |
1,376 |
| 10 |
1.900 |
0.109 |
1.682 |
8,605 |
3,002 |
| 40 |
1.900 |
0.145 |
1.610 |
11,447 |
4,332 |
| 80 |
1.900 |
0.200 |
1.500 |
15,789 |
6,364 |
| 2 |
5 |
2.375 |
0.065 |
2.245 |
4,105 |
896 |
| 10 |
2.375 |
0.109 |
2.157 |
6,884 |
2,196 |
| 40 |
2.375 |
0.154 |
2.067 |
9,726 |
3,526 |
| 80 |
2.375 |
0.218 |
1.939 |
13,768 |
5,418 |
| 2 1/2 |
5 |
2.875 |
0.083 |
2.709 |
4,330 |
1,001 |
| 10 |
2.875 |
0.120 |
2.635 |
6,260 |
1,905 |
| 40 |
2.875 |
0.203 |
2.469 |
10,591 |
3,931 |
| 3 |
5 |
3.500 |
0.083 |
3.334 |
3,557 |
639 |
| 10 |
3.500 |
0.120 |
3.260 |
5,142 |
1,375 |
| 40 |
3.500 |
0.216 |
3.068 |
9,257 |
3,307 |
| 3 1/2 |
5 |
4.000 |
0.083 |
3.834 |
3,112 |
431 |
| 10 |
4.000 |
0.120 |
3.760 |
4,500 |
1,081 |
| 4 |
5 |
4.500 |
0.083 |
4.334 |
2,766 |
315 |
| 10 |
4.500 |
0.120 |
4.260 |
4,000 |
845 |
| 40 |
4.500 |
0.237 |
4.026 |
7,900 |
2,672 |
| 5 |
5 |
5.563 |
0.109 |
5.345 |
2,949 |
350 |
| 10 |
5.563 |
0.134 |
5.295 |
3,613 |
665 |
| 6 |
5 |
6.625 |
0.109 |
6.407 |
2,467 |
129 |
| 10 |
6.625 |
0.134 |
6.357 |
3,033 |
394 |
- 1 in (inch) = 25.4 mm
- 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-2 bar
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