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Permalink Reply by William N. Hoehn on June 2, 2016 at 3:22pm

Mark, I see that no-one replied to this.  Where did this advice come from?  If you have reservations, please contact the compressor and filter makers.  Generally the most serious problem with cold weather operations occurs because of inadequate moisture removal in the compressed air.  Cold weather usually creates lower dew points in the ambient air, thus making less moisture for the adsorption columns or separators to remove.  When a compressor is running, compressing air causes heat generation, that will for the most part prevent freezing of valves and bleeders.  I would be more concerned about inadequate moisture removal in humid warmer weather.  If using 4,500 psi air, there is a rapid drop in temperature across the high pressure regulator, and you must monitor the moisture content of your breathing air, to keep the dew point below minus 65 deg. F.  There is a pressure gradient, dew point curve that will allow minus 65 F dew point air to drop out liquid water at 42 degrees and 6,000 psi as used in some aerial mounted large cylinders.  This liquid can freeze as it passes through a high pressure regulator and cause flow problems for hose supplied air in an aerial basket.

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