Originally Posted by PKLehmer
That's not quite true...
O2 is needed to make anything flammable but it is not flammable by itself. Unless he has a source of ignition and some kind of fuel lying around he's fine. I can't imagine what fuel source (besides propane) any of us would bring near our beer.
So the lesson here kiddies is don't aerate your gasoline while trying to light a match.
any lint/dust in the air becomes flamable in 100% 02, unless you are in a clean room, there is plenty that will burn in a 100% 02 air stream. silicon lube (keg lub) is highly flamable in 100% O2, and if you keg you have that around. All you need is the ignition source. And once it starts burning, the metal of the tank valve itself can burn.
He can do what he want's but telling someone to just open the tank without a reg, is a good way to get someone killed.