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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'.
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