Originally Posted by P-J
Do not ever try to adapt a regulator to an O² tank. That is an extremely bad idea & you will be playing "you bet your life".
Use an Oxygen regulator only.
Amen to this. I work in the cryogenic gas industry. My company makes liquid oxygen and nitrogen. Oxygen systems need to be specifically designed for oxygen use. Things you wouldn't normally think as flammable in regular air can be extremely flammable in pure oxygen atmospheres. Think things like gaskets, lubricants, seals, etc. In addition, the valve and regular parts should be stainless steel or monel. Carbon steel can ignite if the gas velocity is too high. And when it ignites, it's not a slow burn. It's an explosion. Then if you have stainless steel tubing hooked up to the valve or regulator, that will burn too. Then your oxygen cylinder will go off. Are you getting the idea here? I've seen men die from chain reactions like this.
When ordering valves and regulators for oxygen service you should try to buy it directly from the vendor. Don't take the word of Jack from the auto body shop that's selling you a second hand part. Always specify that the valve or regulator will be used in oxygen service and ask them to have it "oxygen cleaned". It may cost you a few extra dollars, but if there is any residual lubricant from machining the parts you are looking at a very hazardous situation. Also, make sure your hands are clean when handling oxygen valves and parts. If you have grease all over your hands and that grease gets on the inside of the valve, even a tiny bit, it will ignite and your whole system will go up with it.
Yes, I'm trying to scare you. Pure oxygen is dangerous stuff, and the hazards are real.