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# Compressed Air Piping - Pressure Loss Diagrams, Imperial Units

## Pressure drop in compressed air pipelines with 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

Download and print Compressed Air - Pipe Line Pressure Drop (gauge 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

Download and print Compressed Air - Pipe Line Pressure Drop (gauge Pressure 50 psig)

### Applied Pressure 150 psig

Download and print Compressed Air - Pipe Line Pressure Drop (gauge Pressure 50 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 Pipe Line Pressure Loss other Dimensions

Compressed air pressure drop in pipes with other dimensions than schedule 40 can be calculated from

dp = dp40 (d40 / d)5                                          (1)

where

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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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

3 10