Pressure drop in compressed air pipelines - applied pressure 50, 100 and 150 psi
Pressure drop in psi per 100 ft compressed air pipelines can be estimated for some typical entering pressures in the diagrams below. The diagrams are calculated for schedule 40 pipes.
Other dimensions or pressures can be calculated with the
Applied Pressure 50 psig
- 1 ft (foot) = 0.3048 m
- 1 cfm = 1.7 m3/h = 0.028 m3/min
- 1 psi = 0.069 bar = 0.070 kg/cm2
Applied Pressure 100 psig
Applied Pressure 150 psig
The SCFM - Standard Cubic Feet per Minute - determines the weight of air to fixed or "Standard" conditions. There are several definitions of SCFM. The most common used in the United States is with properties:
- 14.696 Pounds per Square Inch (psia)
- 60 Degrees Fahrenheit (oF)
- 0% Relative Humidity (RH).
Europeans normally use one ATA and 0oC as SCFM.
Compressed Air Pressure Drop for Pipe Other than Schedule 40
Compressed air pressure drop in pipes other than schedule 40 can be calculated as
dp = dp40 (d40 / d)5 (1)
dp = actual pressure drop (psi per 100 ft pipe)
dp40 = pressure drop in schedule 40 pipe from the table or diagram above (psig per 100 ft pipe)
d40 = inside diameter schedule 40 pipe (inches)
d = actual inside diameter (inches)