Scubastud16
Contributor
And yet this happens every day in cave country in Florida, and their fills are great.
Using a water bath works very nicely. Just because the inside of the cylinder heats up doesn't mean that the heat can't be transferred to the water surrounding it -- in fact, it transfers quite quickly and efficiently.
If you have moisture condensing inside your cylinder, then the air being put in there by the shop is dirty. Grade-E air is supposed to have a dew point of -65F or something ridiculously low.
+1. The tank will not get as hot during filling....try it yourself. I do it on a daily basis at the shop I work at. Thermodynamics says so!
