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How to Save a Workshop Air Compressor from High Humidity Water Collection
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Q: I’m having a lot of trouble with moisture accumulating in my Craftsman 25-gallon two-stage air compressor. The problem is that I’ll shut it down and empty the tank after closing up shop, but first thing in the morning when I turn it on, I have to drain it again. I have a filter and air dryer (that I have to replace every other week) all connected and seemingly working properly. Is this moisture problem due to high humidity (thanks to living on the Mississippi coast), or is there something else going on? Any help would be greatly appreciated.

A: Yes, the water accumulation is due to high humidity, and short of dropping the humidity in the room the compressor occupies, the unit will continue to condense the moisture in the air into water. The fact that you must drain it first thing in the morning after draining it at night indicates that there is a lot of moisture collecting in the lines as well as what collects in the tank. I would have a dryer or moisture filter right at the tank output to stop water from filling the lines. You will still have to drain the tank regularly, but that should get you back to once a day and help keep the lines dry. There are highly effective, self-draining air dryers available that produce almost dry air, but they typically cost far more to buy and operate than the compressor you described. Unless you plan to move to Arizona, the cheapest course of action is to continue draining regularly.

posted on February 1, 2008 by Michael Dresdner
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