Theoretical horsepower required to compress one cubic foot of free air (atmospheric pressure) for single-staged, two-staged and three-staged compressors are indicated in the diagram below. In general - plus 15-20% friction.
The power required for adiabatic (process without transfer of heat) compression of air can be expressed as
HP = [144 N P 1 V k / (33000 (k - 1))] [(P 2 / P 1 ) (k - 1)/(N k) - 1] (1)
HP = horsepower
N = number of compression stages
k = 1.41 = adiabatic expansion coefficient
P 1 = absolute initial atmospheric pressure (psi) (14.7 psi at sea level)
P 2 = absolute final pressure after compression (psi)
V = volume of air at atmospheric pressure - standard or free air (scfm, ft 3 /min)
Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves.
Pipe line sizing compressed air
Pressure drop in compressed air pipe lines.
Pressure drop in compressed air pipelines with applied pressure 50, 100 and 150 psi.
Compressed air is used for power tools, instrumentation, processing, breathing and medical purposes.
The ratio of compressed air pressure to free air pressure.
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