Pressure and Maximum Content of Water in Saturated Air

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 20^oC and 70% water content. The air leaves saturated at gauge pressure 8 bar and 50^oC.

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.

The difference

    (1.26 kg) - (0.9 kg) per 100 m³ free air

        = 0.36 kg per 100 m³ free air

is extracted in the compressor.

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