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On Mon, 29 Aug 1994, Peter R. David wrote: > To clarify the differences between grades of oxygen in the U.S.A.; > > At a recent DAN O2 course, it was pointed out that welding, > medical and aviator oxygen differ only in the water content of the gas > and the certification of the gas. Medical and welding grade oxygen > have the same water content, but medical grade gas is tracked as Jason > Rogers and Frank Deutschmann have already pointed out. Aviator oxygen > is ultra low water content, so that at -80(at 50,000'), the oxygen > regulators won't freeze due to the water in the oxygen. There is a > fourth grade of oxygen, but it isn't available for sale in the US and > I would have to check my notes for its specifications-my recollection > is that it is wetter than all of the above. Um, this is highly dependent on the O2 supplier you use. The person who filled the O2 tanks at the gas house where I used to live in NY indicated that this was not true. Medical and industrial O2 was filled from the same source on the same day. This may be true, depending on where you live, but check it with your gas supplier. There are standards for each grade of gas, but the supplier may decide to give you a gas that passes the standards of a 'better' grade. Nick Simicich - njs%scifi.uucp@uu*.uu*.ne* - njs@bc*.vn*.ib*.co*
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