I have a Little Torch (propane) and 02 setup. My O2 tank is a 40 cf
(short) tank so I don’t really have to keep it chained to keep it
from falling over, it’s a pretty squatty little tank. When full, it
contains 2000 pounds of pressure. I’m using a dual stage regulator,
and I run my torch at 14 lbs of 02 when in use. This is what the
manual says to use (15 actually). Hope this helps.