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Wrolf, by your owon measure, you make no sense. 1.5 means nothing, you pulled that out of your ass or off of some mindless TDI crap. If you set an acceptable nitrogen ppp and an acceptable oxygen pp, you will find that there is NO depth for which air is the right gas - you missed my point. Thre is another dimesion to this that you are unaware of, which is time, and therefore you make even less sense. Maximum ppn and ppo are the STARTING point only. I would suggest starting over sans the attidude. Wrolf.Courtney@do*.co* wrote: > > gmirvine@sa*.ne* wrote: > >Wrolf, you have all the answers, right? You tell us what the right > >depth is for air - go ahead - tell us what is the depth for which air is > the correct mix using any set of standards >or logic you can think of. > >Let's hear it, Rolf, you can not hide behind anything else - thre is no > >bad language here, there is no attack - just you and you can now tell us > all the depth. What is the perfect depth for >this gas, and why? > > I wanted to conduct a poll. It could prejudice the results to announce my > point > of view first. > > However, my point of view is disappointingly conventional. > > Bottom mix: > Depth/fsw Best Good Acceptable Marginal > 0 - 60' Air. EAN 36, EAN32 > 60 ' to 100' EAN 36 Air, EAN 32 > 100' to 130' EAN 32 Air > 130' to 180' Light trimix Custom Nitrox Air > 180' to 200' Light trimix Air > 200' plus Trimix > > So air is the best mix from 0' to 60', good for 60' to 130', acceptable > from 130' to 180', > and marginal from 180' to 200'. > > My principal assumptions are: > > 1. Max ppO2 < 1.5 ATA > 2. Narcotic effects of N2 are effectively identical to 02 > 3. Narcotic effects of (any mixture of) nitrox are manageable up to 130', > and are > progressively less manageable until approximately 180' to 200', at > which point they > pose excessive risk for most dives. > > So even if narcosis at 200' to 250' is manageable for a given diver, > profile, environment etc., > CNS toxicity mandates adding helium to the mix. > > But adding helium implies adding separate decompression gases to keep > decompression times acceptable. > Gas switches adds to task loading, so as soon as add any helium to the mix, > add enough to make the > END = approx 130'. For very complex dives, you can trade off more deco > time for less narcosis and set > END = 100'. > > I would really like to know your opinion on this subject. When you refer > to deep air, > are you referring to the use of air deeper than 200'? 130'? 60'? On > grounds of CNS 02 > toxicity, viscosity/work of breathing, narcosis, or what? > > I would also like the opinion of the many other techdivers whose opinions I > respect. > > Safe net.diving, > > Wrolf > > P.S. Gee, Irving! How *did* you know that I had all the answers? Fax me > $20 and I will send them > to you. ;-) -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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