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>In the old days the rule was PPO2 of 2.0 at approx 256' on air was ok. >The tech. community has changed. It will continue to change as needed. If you give an "approx", you should at LEAST be in the ballpark, 256' isn't even close. What's *REALLY* scary is that you didn't recognize it. I suggest you go back and read some introductory books perhaps rework some math, and NO do NOT use a calculator, they've become so much of a crutch that people can no longer do rough calculations in their head so when they get WRONG answers they don't even realize it!!! Hell, even sitting at my desk (actually, I'm in bed right now, I'm going down to my desk in a few minutes to knock off some work) I know that a PPO2 at 2.0 ATA is at 9atm down, which is 297 ft using 20% O2 in air as a baseline. That's without a calculator and without any thinking. Using 20.9% (which is more accurate), 2.0 PPO2 will work out to some depth LESS than 297'. Using some good old fashioned common sense and a little mental arithmetic, I can take 1/20 of the total depth (to add 1%, then take away 1/10 of that to come up with 20.9 - if you didn't follow this part, ok) to come up with roughly 283'. It took me much longer to type this than to do the math, and I type very well. You should even be able to do this last calculation without too much difficulty or any "on line" calculations that you might have to do under stress will really be suspect. -Carl-
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