Related Resources: fluid flow

### Flow of Air in Pipes Equation and Calculator

Flow of Air in Pipes Equation and Calculator

where:

v = velocity of air in feet per second (ft/sec)
p = loss of pressure due to flow through the pipes in ounces per square inch (ounces/in2)
d = inside diameter of pipe in inches (in)
L = length of pipe in feet (ft)

The horsepower required to drive air through a pipe equals the volume of air in cubic feet per second multiplied by the pressure in pounds per square foot, and this product divided by 550.

 Velocity of Air Ft/sec Actual Inside Diameter of Pipe, Inches 1 2 3 4 6 8 10 12 16 24 1 2 3 4 5 6 7 8 9 10 12 15 18 20 24 25 28 30 0.33 0.65 0.98 1.31 1.64 1.96 2.29 2.62 2.95 3.27 3.93 4.91 5.89 6.55 7.86 8.18 9.16 9.80 1.31 2.62 3.93 5.24 6.55 7.85 9.16 10.50 11.78 13.1 15.7 19.6 23.5 26.2 31.4 32.7 36.6 39.3 2.95 5.89 8.84 11.78 14.7 17.7 20.6 23.5 26.5 29.4 35.3 44.2 53.0 59.0 71.0 73.0 82.0 88.0 5.2 10.5 15.7 20.9 26.2 31.4 36.6 41.9 47.0 52.0 63.0 78.0 94.0 105.0 125.0 131.0 146.0 157.0 11.8 23.6 35.3 47.1 59.0 70.7 82.4 94.0 106.0 118.0 141.0 177.0 212.0 235.0 283.0 294.0 330.0 353.0 20.9 41.9 62.8 83.8 104.0 125.0 146.0 167.0 188.0 209.0 251.0 314.0 377.0 419.0 502.0 523.0 586.0 628.0 32.7 65.4 98.2 131.0 163.0 196.0 229.0 262.0 294.0 327.0 393.0 491.0 589.0 654.0 785.0 818.0 916.0 982.0 47.1 94.2 141.4 188.0 235.0 283.0 330.0 377.0 424.0 471.0 565.0 707.0 848.0 942.0 1131.0 1178.0 1319.0 1414.0 83.8 167.5 251.3 335.0 419.0 502.0 586.0 670.0 754.0 838.0 1005.0 1256.0 1508.0 1675.0 2010.0 2094.0 2346.0 2513.0 188 377 565 754 942 1131 1319 1508 1696 1885 2262 2827 3393 3770 4524 4712 5278 5655

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