Compressed Air Pipe Lines - Pressure Loss vs. Capacity and Operating Pressure
Pressure drop in a compressed air pipe line depends on line pressure, air flow and size of pipe.
Pressure Loss in Schedule 40 Steel Pipes
| NPS (in) | Air Flow1) (SCFM) | Pressure Loss per 100 ft pipe (psi) | |||
|---|---|---|---|---|---|
| Line Pressure (psig) | |||||
| 50 | 75 | 100 | 125 | ||
| 1/2 | 10 | 0.7 | 0.5 | 0.4 | 0.3 |
| 20 | 2.7 | 2.0 | 1.6 | 1.3 | |
| 30 | 5.9 | 4.3 | 3.4 | 2.8 | |
| 40 | 7.5 | 5.8 | 4.8 | ||
| 50 | 9.0 | 7.4 | |||
| 60 | 12.9 | 10.6 | |||
| 3/4 | 10 | 0.2 | 0.15 | ||
| 20 | 0.9 | 0.5 | 0.4 | 0.3 | |
| 50 | 3.8 | 2.7 | 2.1 | 1.8 | |
| 80 | 6.8 | 5.2 | 4.4 | ||
| 100 | 10.6 | 8.3 | 7.0 | ||
| 125 | 12.9 | 10.7 | |||
| 150 | 13.9 | ||||
| 1 | 20 | 0.2 | 0.1 | 0.1 | |
| 50 | 1.1 | 0.8 | 0.6 | 0.5 | |
| 75 | 2.6 | 1.7 | 1.3 | 1.1 | |
| 100 | 4.1 | 3.0 | 2.3 | 1.9 | |
| 125 | 6.3 | 4.5 | 3.5 | 2.9 | |
| 150 | 6.5 | 5.1 | 4.2 | ||
| 200 | 8.9 | 7.3 | |||
| 250 | 11.3 | ||||
| 1 1/2 | 50 | 0.1 | |||
| 75 | 0.3 | 0.2 | 0.15 | 0.1 | |
| 100 | 0.5 | 0.3 | 0.3 | 0.2 | |
| 125 | 0.7 | 0.5 | 0.4 | 0.3 | |
| 150 | 1.0 | 0.8 | 0.6 | 0.5 | |
| 200 | 1.8 | 1.3 | 1.0 | 0.8 | |
| 250 | 2.8 | 2.0 | 1.6 | 1.3 | |
| 300 | 4.0 | 2.9 | 2.3 | 1.9 | |
| 400 | 7.0 | 5.0 | 4.0 | 3.2 | |
| 500 | 7.8 | 6.2 | 5.1 | ||
| 600 | 8.8 | 7.2 | |||
| 700 | 11.9 | 9.8 | |||
| 800 | 12.8 | ||||
| 2 | 100 | 0.1 | |||
| 150 | 0.3 | 0.2 | 0.2 | 0.1 | |
| 200 | 0.5 | 0.4 | 0.3 | 0.2 | |
| 250 | 0.8 | 0.6 | 0.4 | 0.4 | |
| 300 | 1.1 | 0.8 | 0.6 | 0.5 | |
| 400 | 1.9 | 1.4 | 1.1 | 0.9 | |
| 500 | 2.9 | 2.1 | 1.7 | 1.4 | |
| 600 | 4.2 | 3.0 | 2.4 | 2.0 | |
| 800 | 5.4 | 4.2 | 3.4 | ||
| 1000 | 8.3 | 6.5 | 5.3 | ||
| 1250 | 10.0 | 8.3 | |||
| 1500 | 11.9 | ||||
| 2 1/2 | 150 | 0.1 | |||
| 200 | 0.2 | 0.15 | 0.1 | ||
| 250 | 0.3 | 0.2 | 0.2 | 0.1 | |
| 300 | 0.5 | 0.3 | 0.3 | 0.2 | |
| 400 | 0.8 | 0.6 | 0.5 | 0.4 | |
| 500 | 1.2 | 0.9 | 0.4 | 0.6 | |
| 600 | 1.7 | 1.3 | 1.0 | 0.8 | |
| 800 | 3.0 | 2.2 | 1.7 | 1.4 | |
| 1000 | 4.7 | 3.4 | 2.7 | 1.9 | |
| 1250 | 7.5 | 5.4 | 4.2 | 3.5 | |
| 1500 | 7.5 | 5.9 | 4.8 | ||
| 2000 | 10.3 | 8.5 | |||
| 2500 | 13.3 | ||||
| 3 | 300 | 0.1 | 0.1 | ||
| 500 | 0.4 | 0.3 | 0.2 | 0.2 | |
| 750 | 0.8 | 0.6 | 0.5 | 0.4 | |
| 1000 | 1.5 | 1.1 | 0.8 | 0.7 | |
| 1500 | 3.3 | 2.4 | 1.9 | 1.5 | |
| 2000 | 5.9 | 4.2 | 3.3 | 2.7 | |
| 2500 | 5.6 | 5.1 | 4.2 | ||
| 3000 | 9.4 | 7.4 | 5.1 | ||
| 3500 | 10.1 | 8.3 | |||
| 4000 | 13.1 | 10.8 | |||
| 4500 | 13.6 | ||||
| 4 | 750 | 0.2 | 0.15 | 0.1 | |
| 1000 | 0.4 | 0.3 | 0.2 | 0.2 | |
| 1500 | 0.8 | 0.6 | 0.5 | 0.4 | |
| 2000 | 1.5 | 1.1 | 0.8 | 0.7 | |
| 2500 | 2.2 | 1.6 | 1.3 | 1.1 | |
| 3000 | 3.2 | 2.3 | 1.8 | 1.5 | |
| 4000 | 5.7 | 3.4 | 3.2 | 2.6 | |
| 5000 | 6.3 | 5.0 | 4.1 | ||
| 6000 | 9.0 | 7.1 | 6.8 | ||
| 7000 | 9.7 | 7.9 | |||
| 8000 | 12.7 | 10.3 | |||
1) Free Air Inflow Volume Flow at Standard Conditions
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