glcaines
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I drain my tanks of water only at the end of each day. If it's going to be several days before driving again, I drain all air as well. When I was on active duty, the common practice was to drain water only at the end of each day, but I don't remember what the 'official' procedure was. I do remember that during inspections, if a drain cock was opened and water came out, you were in trouble.
One interesting side note: Air tanks under pressure do not rust and corrode as fast as tanks without any pressure. This is a commonly known fact from scuba diving. Steel scuba tanks are always stored with full pressure, to prevent rust and corrosion. However, this is of minimal consideration for Deuce air tanks because they always leak down fairly quickly, unlike scuba tanks. Also, air put into scuba tanks is normally very dry.
One interesting side note: Air tanks under pressure do not rust and corrode as fast as tanks without any pressure. This is a commonly known fact from scuba diving. Steel scuba tanks are always stored with full pressure, to prevent rust and corrosion. However, this is of minimal consideration for Deuce air tanks because they always leak down fairly quickly, unlike scuba tanks. Also, air put into scuba tanks is normally very dry.