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Peter R. David sez: > Although it is possible for someone to accidently fill your > tanks with acetylene, it is unlikely; the threads are right/left > handed on the two tanks. For safety reasons (uncontrolled > polymerization, "bang") acetylene is sold at low presure (40psi) > dissolved in acetone. Hence, it is very unlikely that anyone would be > able to fill fill your tank with even a trace of acetylene, without > exploding it and themselves. Still, if you taste it, I'd clear the area > as fast as you can. Boy do I feel dumb: I had totally forgotten about the fact that acetylene is unstable (as in spontaneously explosive) above 2 ATM or so -- so any trace in an O2 cylinder would be serious fireworks! (Which leads me to a really curious thought: do welding shops check the pressure on an O2 tanks prior to refil? Potentially if the tank is below ~40 PSI it may have some acetylene in it, back flowed from a welding rig.) So, there is probably almost no chance that welding O2 could be contaminated: O2 for welding is typically only used with acetylene; it is never (to my knowledge) used with any of the inerts (N2, argon, He, xenon). -frank -- fhd@pa*.co* | Meddle not in the affairs of dragons, for thou 1 212 559 5534 | art convienently snack-sized and very tasty. 1 917 992 2248 | 1 718 746 7061 |
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