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!
( o C)
|Mass of Water in Air (kg H2O /m 3 free saturated air)|
|Pressure (bar gauge)|
- 1 (kg/m 3 ) = 0.0624 (lb/ft 3 )
Pressure in psi (gauge)
Example - Water Extracted from an Air Compressor
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 m 3 free air (0.018 kg water /m 3 air ) .
The amount of water with 70% saturation can be calculated as
( 0.018 kg water /m 3 air ) (70%) / (100%)
= 0.0126 (kg water /m 3 air )
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 m 3 free air (0.0062 kg water /m 3 air ) .
The water extracted in the compressor can be calculated as
( 0.0126 kg water /m 3 air ) - ( 0.0062 kg water /m 3 air )
= 0.0064 ( kg water /m 3 air )