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Lynnhaven Dive Shop is using one and from all accounts it is not a reliable device and has broke down so much they have stopped using it. Jim ------------------------------------------------------------------- Learn About Trimix at http://www.cisatlantic.com/trimix/ > From: Wendell Grogan <wgrogan@dc*.ne*> > Date: Fri, 16 Mar 2001 19:16:22 -0500 > To: Matthias Voss <mat.voss@t-*.de*> > Cc: vbtech@ci*.co*, techdiver@aquanaut.com > Subject: Re: New topic > > Matthias, > Thanks for the information about the russian system. > As for the oxygen concentrators, this is actually a very new system. It > is in two parts. The first is a typical oxygen concentrator that > delivers about 2 to 6 liters per minute of 94% O2 at ambient pressure. > The new thing is the second part which is a compressor that is designed > specifically to be mated to the concentrator. It boosts the pressure to > about 200 bar. This can then be used to fill a standard oxygen tank. > The flow rate is very slow which is why it takes 6 hours to fill a > relatively small bottle, but that is also how it can be used in homes of > people who don't know anything about oxygen handling. > Haven't checked the prices yet. But this is medical equipment so it > isn't going to be cheap. > Wendell > > Matthias Voss wrote: >> >> Wendell, >> There is a very rare russian Scuba working with 2 dewars, one of lox, >> one of ( not sure ) nitrogen/ nitrox/ air. Self mixing, based on >> evaporation temperature and partial pressure. Rare unit. >> Pic are on a webpage somewhere. This is now in Brandenburg, Germany. >> For patients needing longtime high flow oxygen it is standard to use >> liquid oxygen. >> The concentrators sometimes have a compliance problem with patients >> because of their noise. >> >> These could perhaps be used for ambient pressure mixing into a bag, >> before filling it into tanks via a oxygen tolerant compressor. Some >> normal compressors may be used up to 40 % oxygen, but I do not make a >> statement on any other tbrand I am not familiar with. Anyway, at 60% >> oxygen, the charcoal filters will explode . >> Warning! Do NOT collect this to fill it as pure oxygen, calling for >> desaster !!! . >> It is useless to use a Haskel or similar transfer pump because this is >> ambient pressure. >> >> just my 2cc. >> Matthias >> >> Wendell Grogan schrieb: >>> >>> OK guys, new topic. >>> I was talking to some pulmonary people today and ran into a couple of >>> interesting topics. >>> First, liquid oxygen. A tank of liquid O2, which wouldn't take up more >>> room than a pair of doubles, can carry something like 34,000 liters of >>> oxygen. This is enough to supply 15l per minute for 7 hours. Question, >>> does anyone know if this could be applied to practical use on a dive >>> boat- i.e.. emergency oxygen for deco symptoms, or use as a source of >>> oxygen for mixing on a multi day dive? >>> Second, there are "oxygen concentrators" that can be used to fill oxygen >>> bottles. The machines can deliver about 95% pure O2, at 2000psi at a >>> rate that would fill a deco bottle in about 6 hours. This might be >>> useful for just plugging in at home, filling you O2 tanks during the >>> week, and then going diving over the weekend. The only down side I can >>> see is that the units use about 800watts per hour. Not a huge amount of >>> electricity, but still not inconsequential. >>> Wendell G >>> -- >>> 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'. > -- > 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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