Loss of Air Pressure Due to Friction


Free Air Capacity
in CFM
(at 14.7PSI) 
Equivalent Capacity
in CFM
(at 100 + 14.7PSI) 
Loss of Pressure in PSI Per Pipe ID     
1/2″ 3/4″ 1″ 1(1/4)” 1(1/2)” 2″
10 1.28 1.38 0.09 0.03 0.007    
20 2.56 1.42 0.34 0.10 0.026 0.012  
30 3.84 3.13 0.74 0.23 0.056 0.026  
40 5.13 5.55 1.28 0.38 0.096 0.044 0.013
50 6.14 8.65 2.00 0.60 0.146 0.067 0.020
60 7.69   2.84 0.84 0.210 0.095 0.027
70 8.97   3.85 1.12 0.280 0.130 0.036
80 10.25   5.01 1.44 0.360 0.160 0.046
90 11.53   6.40 1.85 0.450 0.200 0.058
100 12.82   7.80 2.21 0.550 0.250 0.069
125 16.02   12.40 3.41 0.850 0.380 0.107
150 19.22   18.10 4.91 1.200 0.540 0.0150
175 22.43     6.80 1.640 0.730 0.200
200 25.63     8.79 2.120 0.950 0.260
250 32.04       3.300 1.480 0.400
300 38.45       4.700 2.100 0.570
350 44.86       6.450 2.860 0.770
400 51.26       8.300 3.700 0.990
450 57.67         4.650 1.270
500 64.08         5.790 1.560
600 76.90         8.450 2.230
700 89.71           3.000
800 102.50           4.000
900 115.30           5.050
1000 128.20           6.200

(Per 30m of Pipe, 100psi Initial Pressure)

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