Phil Scott said:
Very interesting... I hadnt understood those factors at
all. I still cant fathom that the acytylene would blow
though.. in any case of mission acetone, since there is no
oxygen present... unless you run the oxy regulator at 20
psig... and the acytlene regulator set say at 7 lbs leaks
backwards allowing oxygen onto the acty tank...
Do you know the details and why etc on this range of
issues? I only have these loose conclusions.
Google is your friend.... ;-)
http://www.weldingsupply.net/acetylen.htm
"Unless dissolved in a solvent, acetylene will dissociate at pressures above
15 psig and form lamp black and hydrogen. Heat is generated with
dissociation, which in turn, produces a danger of explosion."
I may be a bit paranoid about the "several hours", but I haven't had any
blow up in my face

The key is to let the acetone in the neck and valve
find its way back down into the 'porous material'. A small bubble of gas
right at the valve on top of the cylinder will dissociate and not generate
enough heat to be a problem. But if you stand it up and open the valve
right away, you can 'spit' out some acetone. Repeatedly, and you develop a
gas bubble/space in the cylinder, too much acetone leak out and bad news.
And of course, if used while laying down, then a fair amount of acetone
comes out right away, leaving a sizable bubble of acetylene to form inside
the cylinder, under more than 15 psig of pressure.
daestrom