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FT>Ronnie Bell sez: > Lets say I am diving a cave that has 90 percent of the passage at 110 and > 10 percent at 160. I am not going to use mix for that dive! For me it's > just not that dangerous . 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. > I seem to recall that the limit used to be 1.8, then went to 1.6 now I > hear a call for 1.4. Hmmmmmm? FT>From memory, didn't the US Navy establish a PPO2 limit of 1.2 ATA waaayyy back FT>when? (This doesn't get much publicity, but I'm fairly sure it is accurate.) In the 60's and 70's the Navy approved MAX PpO2 was 2.0, for short duration exposures. Most of the dives I've seen in the 170 - 240 fsw range have been 30 minutes or less (usually 20) which I would judge to be short duration. There is nothing wrong with placing your own safety limits and abiding by them, just don't push your limits on me. MRWConsult@ex*.co* /\/\/ --- � DeLuxe� 1.25 #11829 � Silly Humans . . .
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