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On Wed, 5 Apr 1995, Jason Rogers wrote: > Can anyone explain the difference between me home brewing Nitrox (or trimix) > and a shop brewing it? If you do it correctly there is NO DIFFERENCE. In order to do it properly you will need (is this obvious?) a source of O2 and an O2 analyzer (two are better). Many people here is the states use non-medical grade O2. This could present a problem. Scneario. Welder has an empty O2 cylinder, acetelyne has entered the tank by backflow from the torch. Tank gets returned to welding supply house. Since it is a welding tank, it's simply filled. NOT emptied, flushed and filled but just filled. O2 on top of the acetylene. You bring your tank to the supply house to get it filled. They take your tank and give you the contaminated tank! The answer is to request that you get YOUR tank filled. Usually (in my area) this means a 10-14 day wait as the actual fill station is many times off site. Another alternative is to request aviator oxygen. No prescription is required for this, and the price is somewhere between that of welding and medical grade O2. Here at least, ALL O2 comes from the same supply tanks. The only difference is that the aviator and medical grade fills are recognized as life support gas and are treated as such. Depending on the shop yuor welding O2 could be either just as good as medical grade or really contaminated. My limited experience with fill stations is that their accuracy leaves something to be desired. Case in point, we were doing a 330 foot dive and we analyzed the trimix to find that rather than presenting a PPO2 of 1.4 as requested at depth it would have been 1.7. Could present peoblems couldn't it? Safe Diving r.b.
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