Compressed Air Pipe Lines - Pressure Loss

Pressure drop in compressed air pipe lines

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)
5075100125
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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