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> One thing I was wondering. If you are going to all the trouble and > expense of using non-air mixes why use Nitrox at all instead of > Trimix or Heliox? > > It seems to me that you would get even more bottom time or greater > dcs protection without the added risk of O2 toxicity by using those > mixes instead of Nitrox. Yes, He-O2 is probablly a much better diving gas than Air or Nitrox, even for shallow diving. The "He clock" is slower than the N2 clock, so there is less incentive to run high PO2's with He-O2. Trimix may be a better compromise, as it is cheaper. But if we are talking cost-no-object best gas mix, a Neon or Xenon blend wwould be better still. Those don't even have any drawbacks with dry suit use, other than cost. > Is Nitrox that much cheaper? Is special equipment needed for Trimix > that is expensive? The He is expensive, and analyzing a TriMix cylinder for He content is either impossible or very expensive (an He analyzer is very expensive). Also, He ends to bleed through valves, etc (just like in He baloons), so a TriMix tank needs to be used soon after mixing, in order to ensure blend. > Rick Fincher > rnf@sp*.tb*.co* -frank -- fhd@pa*.co* | Captain Starlet is indestructible; you are not. 1 212 559 5534 | Remember this -- do not try to imitate him. 1 917 992 2248 | -- Big Audio Dynamite 1 718 746 7061 | _No. 10, Upping St._, "Sightsee M.C!"
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