# Compressed Air - Pressure Drop Diagrams in Metric Units

## Pressure drop in compressed air pipe lines

Compressed air pipeline pressure drop in *kg/m ^{2} per 100 m* pipe can be estimated for typical entering pressures in the diagrams below. The diagrams are calculated for schedule 40 pipes.

Other dimensions or pressures can be calculated with the

### Compressed Air Entering Pressure *5 kg/cm*^{2}

^{2}

*1 kg/cm*^{2}= 0.98 bar = 735 mmHg = 10000 mmH_{2}O = 14.2 psi*1 m*^{3}/min = 0.017 m^{3}/s = 60 m^{3}/h = 1000 liter/min = 35.3 cfm*1 m (meter) = 3.2808 ft = 39.37 in*

### Compressed Air Entering Pressure *7.5 kg/cm*^{2}

^{2}

### Compressed Air Entering Pressure *10 kg/cm*^{2}

^{2}

### Compressed Air Entering Pressure *13 kg/cm*^{2}

^{2}

### Compressed air pressure drop for pipes other than Schedule 40

Compressed air pressure drop in pipes other than schedule 40 can be calculated as

dp = dp_{40}(d_{40 }/ d)^{5}(1)

where

dp = actual pressure drop (bar per 100 m pipe)

dp_{40}= pressure drop in schedule 40 pipe from the table or diagram above (bar per 100 m pipe)

d_{40}= inside diameter schedule 40 pipe (inches)

d = actual inside diameter (inches)