by Pierre
(North Bay Ont Ca)

Air left in compressor for two months while idle. Problem?


Pierre, the ideal scenario is to open the tank drain to bleed off all air, and all the water that has accumulated in the tank during use, so that the tank is dry while in storage.

Else, your tank will eventually rust.

Does that bother you? Is the fact that your tank might get a rust hole in it faster if you don’t drain it than if you do important?

Only you can decide.

Me, I try to drain my tank regularly, and only leave air in it, if I’m using it the next day.

Compressed air tank

Compressed air tank


Leaving tank pressurized
by: Doug

So If at the end of the day compressor has been off for hours I would assume that the air temp had fallen to room temp. Can You simply open drain for 10-20 seconds to push out moisture and close up to save the compressed air for another day?

Is that OK to leave it pressurized and will not rust or is it best to drain tank completely to remove all compressed air even if it has cooled off and the water vapor has condensed to liquid?


Ultimately, the compressor tank will rust through regardless.

By draining regularly, you defer the date you have to replace the tank or compressor.

Electric auto drains do what you suggest by cycling open periodically for a fixed period.

So yes, if you open the drain until water and mist stop flowing out, and if you still have air in the tank, close the drain to save the air.

That’s what I do.



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