Compressed Air Piping and Pressure Drop Diagrams - Imperial Units

Pressure drop in compressed air pipelines - applied pressure 50, 100 and 150 psi

Pressure drop in psi per 100 ft compressed air pipeline 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

compressed air pipeline pressure drop diagram 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

compressed air pipeline pressure drop diagram 100 psig

Applied Pressure 150 psig

compressed air pipeline pressure drop diagram 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 commonly used in the United States is based on the 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)

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