Re: how much p.s.i. can a used Freon tank hold?
As an HVAC tech, there are a few things to remember when useing these tanks for air.It is very dangerous to use old Freon (disposable) cylinders for compressed air. These cylinders are much thinner than "refillable" types (such as the BBQ grill tanks). When filled with "air" the moisture drops out of the air under pressure, and sets on the bottom
and it rusts it away. The cylinder can then "explode" and kill someone. When filled with the original refrigerant, there is no "rusting" or chemical reaction going on inside the cylinder.
I have seen these tanks rust fron the outside and explode in a van, looked like a gernade had gone off in there. Also if you DOT catches you using a disposable Freon tank for compressed air, you may get upto a $250,000 fine. If it is transported off your property.I use a refilable tank that has a drain valve on it and a blow off valve set at 250psi.
Just a word to the wise and my 2cents.
if its clean, I aint having fun!