Pressure Loss in Compressed Air Pipe Lines
Pressure drop in compressed air pipe lines
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Pressure drop in compressed air pipe lines depends on the line pressure, the air flow and the size of pipe. Pressure loss in schedule 40 steel pipes with compressed air ranging 50 to 125 psig can be estimated from the table below.
| 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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