Pressure and Maximum Content of Water in Saturated Air

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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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