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# Compressed Air - Water Content

## Saturation pressure and maximum water content in compressed air.

The maximum content of water in air at saturated conditions decrease with pressure and increase with temperature as indicated in the diagrams below.

### Pressure in bar (gauge)

For full table with Pipe and Water Weight - rotate the screen!

Mass of Water in Air (kgH2O/m3 free saturated air)
Temperature
(oC)

Pressure (bar gauge)
02468101214
0 0.0045 0.0015 0.00091 0.00065 0.00051 0.00041 0.00035 0.00030
20 0.018 0.0058 0.0035 0.0025 0.0019 0.0016 0.0013 0.0012
40 0.059 0.019 0.011 0.0079 0.0062 0.0050 0.0043 0.0037
60 0.18 0.053 0.031 0.022 0.017 0.014 0.012 0.010
80 0.65 0.14 0.078 0.054 0.041 0.034 0.028 0.024
100 0.38 0.19 0.13 0.094 0.076 0.063 0.054
120 0.49 0.29 0.21 0.16 0.13 0.11
• 1 (kg/m3) = 0.0624 (lb/ft3)

### Example - Water Extracted from an Air Compressor

Free air enters a compressor at atmospheric conditions 20oC and 70% humidity ratio. The air leaves saturated at gauge pressure 8 bar and 40oC.

Based on the diagram and table above the water content in saturated air entering the compressor can be estimated to be approximately 1.8 10-2 kg per m3 free air (0.018 kgwater/m3air)

The amount of water with 70% saturation can be calculated as

(0.018 kgwater/m3air) (70%) / (100%)

= 0.0126 (kgwater/m3air)

The water content in the 100% saturated air leaving the compressor can be estimated from above to be approximately 0.62 10-2 kg per m3 free air (0.0062 kgwater/m3air).

The water extracted in the compressor can be calculated as

(0.0126 kgwater/m3air) - (0.0062 kgwater/m3air)

= 0.0064 (kgwater/m3air)

## Related Topics

• Air Psychrometrics - Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
• Gases and Compressed Air - Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves.

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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

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