Air pressure and maximum content of water in saturated air
The maximum water content in saturated air depends on air pressure and temperature.
Gauge Pressure in bar
Gauge Pressure in psi
Example - Water Extracted from an Air Compressor
100 m3 of free air enters a compressor at atmospheric conditions 20oC and 70% water content. The air leaves saturated at gauge pressure 8 bar and 50oC.
Based on the diagram above the water content in the entering air can be estimated to approximately 1.8 kg per 100 m3 free air. 70% of this maximum content is 1.26 kg per 100 m3.
The water content in the leaving air can be estimated to approximately 0.9 kg per 100 m3 free air.
(1.26 kg) - (0.9 kg) per 100 m3 free air
= 0.36 kg per 100 m3 free air
is extracted in the compressor.
- en: compressed air saturated water content