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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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