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Todd The system is a 50 year old gas technology that has been converted from a means to produce nitrogen to a method to give EANx from air it is air seperation(membrane) technology. The system wiil produce up to 40% by design. It can be ran through any compressor that is oil free. In other words any compressor that is using a non petrolium base lubricant. There are several acceptable lubes available. IANTD will be distributing the lubricant as of DEMA 1996. This will allow almost any compressor to be switched to a non oil based system. The advantage is it opens the technology to the membrane system you refered to and to continious blending at a reasonable cost. Tom You wrote: > >There's an article (that reads a lot like an advertisement) at... > > http://ella.netpoint.net/empg/news/ubs.htm > >that describes a system for producing de-nitrogenated air nitrox (DNAx) >by filtering an adjustable fraction of Nitrogen from air. The benefits >of DNAx to the diver are described much as those of EANx. They also list >benefits to th operator doing the fill, primarily in terms of safety and >simplicity by avoiding high-PPO2 blending. > >They make no mention of whether the system filters out any of the less >common gases present in air (mainly argon and CO2). If it does not, then >clearly the fraction of those gases in the resultant DNAx mix would be >higher than in an otherwise similar EANx mix. The effect would presumably >increase with the targeted FO2 of the final mix. So, does anyone know... > > - whether the less common gases are filtered out? > > - how great a fraction of N2 can be removed, and therefore > what the resultant fractions of argon and CO2 would be if > in fact this effect occurs? > > - whether there is any significant effect on the diver? > >I am mainly wondering about altering decompression penalties with the >argon, and increasing risk of hypercapnia with the CO2. Worst case, >if none of the argon and CO2 are removed, I am thinking of fractions >in the neighborhood of 3.6% argon and .13% CO2 in an 80% O2 mix. That >doesn't seem too horrible, but I figured I'd ask anyway. > >Thanks. > >- Todd > >p.s. Calculations are based on my assumption that the fraction of > argon and CO2 would increase linearly with the fraction of the > oxygen. Therefore... > > .934 * ( 80 / 20.946 ) = 3.6 > .033 * ( 80 / 20.946 ) = .13 > > >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. >
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