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MARK WELZEL sez: > FT>Um, I don't get it; Air at 160 fsw is a PPO2 of 1.2 ATA. What's the problem? > FT>( A 1.4 ATA O2 limit would limit air depth to 190 fsw.) > > Actually Air at 155 fsw has a PpO2 of 1.2 ATA, and 1.4 limits Air to 187 fsw > not 190 fsw, since we're trying to be safe we should round down, not up. Actually, since we are trying to be safe, we should not ascribe more precision to numbers than they are due, regardless of the rounding direction. Neither your depth guage, your pressure guage, nor your O2 analyzer is actually capable of delivering the precision your numbers imply. > In the 60's and 70's the Navy approved MAX PpO2 was 2.0, for short > duration exposures. I actually believe these were exceptional exposures, but I could be wrong here. > There is nothing wrong with placing your own safety limits and > abiding by them, just don't push your limits on me. I would never do that, but I do think conservative guidelines -- *and* the rationale behind them -- are important for those divers not yet experienced enough to set their own. -frank -- fhd@in*.ne* | [M]athematics is not the study of intangible Platonic 1 212 559 5534 | worlds, but of tangible formal systems which have arisen 1 917 992 2248 | from real human activities. 1 718 746 7061 | -- Saunders MacLane
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