That's a great point that I never thought of, even though I deal with compressed air and air testing every day for fire departments! I am embarrassed that the thought never occurred to me... always learning something new from Luis!luis wrote: One important point is that if your tank is full, you should not store your cylinders in the winter in a cold garage or outdoors.
The compressed breathing air is supposed to be very dry, with a dew point of about -65 degrees F, but that dew point is for the air at ambient temperature. When the air is compressed the dew point goes up to about +10F to +15F depending on the fill pressure. My garage normally doesn’t get that cold in the winter, but it gets close.
If the cylinder gets that cold you can get condensation inside.
BUT, lucky for me I am in Texas, where it seldom drops into the 20's, and even far less frequently into the mid-teens! So, in my sphere of reality it just doesn't seem to apply! Hooray for moderate winters here... one less thing to be concerned about.
I do appreciate the point you have made, and it made me realize why the dew point requirements seemed ridiculously low for our local temp conditions. It make sense to have one standard for the whole country.