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The biggest difference is that the USP *bottles* are tracked, so as to be sure they are never let out to a welder. At least thats the idea. The issue is, under very certain circumstances, it *might* be possible for acetylene to get backed into an 02 tank. And, there are differences in how the bottles are evacuated before filling. Also, some suppliers test the bottles after filling, but not all. Aviators 02 is the same friggin gas, just analyzed, and the analysis documented. Everyone I know used welding 02 for years. Now? We can get USP 02 for around $20.00 for 248 cu ft. (K bottle), so there is no reason not to use USP. Scott >This question has plagued me for a while. >What is the difference between breathing oxygen and welding oxygen? > >First,I was told that welding O2 had more hydrocarbons contained in >it, BUT isn't the explosion/fire risk the same? How many auto mechanics wash >and dry there hands before changing a regulator on an >oxy-acetylene torch? The second thing I was told is "there is possibly a >higher moisture content", to me that doesn't hold up either because oxygen >(commercial grade) will always come in a steel cylinder, if there is any >moisture in there it will rust and pretty quickly I might add. So what's the >deal? Anybody? > >______________________________________________________ >Get Your Private, Free Email at http://www.hotmail.com >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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