air pressure loss in steel pipe

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Excessive pressure drop is the most common cause of complaints involving "loss of power" in portable air tools.  When such a complaint arises, be sure that someone takes a pressure reading at the tool while the tool is turned on ... governed tools while under load.

The most common causes of excessive pressure drop are restrictions to air flow in long lengths of small diameter pipes and hoses, in hose fittings, filters, lubricators, and especially in quick disconnect couplings.  For large volumes of air, large lines and fittings are required.

Note: for longer or shorter lengths the pressure loss is proportional  (i.e. for 50 feet use 1/2 of below values.
CFM of
Free
Air		 Air Pressure Loss (PSI) in 100 Ft. of Steel Pipe -
Based on 100 psi at pipe entrace
Nominal Pipe Diameter
1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3
10 0.40 0.10 0.03 0.007        
20 1.40 0.35 0.10 0.026 0.012      
30 3.15 0.70 0.25 0.056 0.026      
40 5.50 1.30 0.40 0.096 0.044      
50 8.60 2.00 0.60 0.146 0.067 0.200 0.008  
60   2.80 0.85 0.210 0.095 0.027 0.011  
70   3.80 1.10 0.280 0.130 0.036 0.015  
80   5.00 1.40 0.360 0.160 0.046 0.019  
90   6.40 1.85 0.450 0.200 0.058 0.024  
100   7.80 2.20 0.550 0.250 0.069 0.029 0.010
125   12.50 3.40 0.850 0.380 0.107 0.043 0.015
150   18.00 4.90 1.200 0.540 0.150 0.061 0.021
175     6.80 1.640 .0730 0.200 0.081 0.028
200     8.80 2.120 0.950 0.260 0.105 0.036
250       3.300 1.480 0.400 0.160 0.054
300       4.710 2.100 0.570 0.230 0.075
350       6.450 2.860 0.770 0.310 0.101
400       8.300 3.700 0.990 0.400 0.131
450         4.650 1.270 0.500 0.165
500         5.790 1.560 0.620 0.200
600           2.230 0.890 0.290
700           3.000 1.180 0.390
800           4.000 2.540 0.500
900           5.050 1.950 0.630
1000           6.200 2.370 0.780
1200           9.050 3.450 1.120
1500           14.500 5.390 1.730
2000             9.660 3.090
2500               4.850
3000               6.980


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