This fellow measured his compressor outlet.
Air compressor line cooler.
In small air systems 20 hp it s common to see the receiver tank used to separate and collect liquids.
Aftercoolers reduce the amount of water vapor in a compressed air system by condensing the water vapor into liquid form.
If the temperature at the discharge port exceeds 300 degrees fahrenheit the refrigerant oil and adjacent mechanisms.
The compressed air enters the air cooled aftercooler.
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Removing the liquid requires a moisture separator and a drain valve.
Aftercoolers are heat exchangers for cooling the discharge from a air compressor.
They use either air or water and are an effective means of removing moisture from compressed air.
Low cost air dryer water separator.
Make no mistake a cooler alone does not yield high quality compressed air.
The compressed air travels through either the spiral finned tube coil or a plate fin coil design of the aftercooler while ambient air is forced over the cooler by a motor driven fan.
Cooling condenses lots of water.
Post cooling all that water is still in the air line.