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Excellent point, and then we have the breaking techniques that have also long ago not only been used to allow this ( elevated ppo2's for deco), but to prevent pulmonary toxicity, the second subject so severely botched by this "doctor". In additon, the times and nubmer used by this guy are so off base as to be ludicrous. Them to make matters even worse, these are the same morons who put out a table of ridiculous PPO2's with "time limits" for diving, in a vacuum of any real application information, which the "training agencies" then latch onto and spread to those who use them to die with. ScottBonis@ao*.co* wrote: > > Hi Martin, > > Thanks for the discourse on oxygen toxicity but I'm afraid that you didn't quite get the objective of my query. You see, I was trying to give you a chance to correct your own mistake. But you felt more comfortable in pontificating and repeating your previous misinformation. So I shall try to restate my comments more directly. > > Your posting to me of 2/9/00 was absolutely correct as long as you were speaking of the NOAA oxygen toxicity limits. However when you said > > << ... If you're going to be exposed to O2 over 0.5 partial pressure on a dive for 125 minutes, you should limit the maximum ppO2 at any point of the dive to 1.4. >> > > This statement is not only wrong, I'm sure it is violated regularly by virtually every experienced deep diver on this list. It is actually ridiculous to try to propagate this kind of garbage on a list that includes some of the premier divers of our time. > > As a simple example of just how stupid your statement is, you are telling me that for any deep dive I do that includes a total time (including deco time) of 125 minutes, I cannot use 100% oxygen for deco at 20 feet. Who do you think you are you kidding? > > You need to go back and learn the meaning of (and how to calculate) a CNS oxygen clock. You will find that it is necessary to consider the amount of time spent at say, a PPO2 of 1.4, then to figure the percentage of the allowable CNS exposure that that time represents. And then to repeat this calculation for each time period which represents a different PPO2. And then to add all of the percentages to arrive at the total for the CNS clock. I personally try to keep this total to less than 50% > > But to say that the maximum PPO2 allowable is a function of the total dive time (without considering the various PPO2's for the different portions of the dive time), is absolutely ridiculous. I strongly suggest that you take a certification course before using any Nitrox blend or if you have been certified to use Nitrox (I hope not so your comments would be simply out of a lack of training), get your money back from your instructor. And for goodness sake, make sure your brain is engaged before > > And you also owe a "thank you" to Trey, Arman and Don Mcinnis for caring enough about your safety to comment on your posting. > > Take care and better luck next time. Scott -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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