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At 04:07 PM 3/23/2000 -0800, you wrote: >Kevin, > >This is the practical answer, but I'm not sure you have the science right. >In theory ppo2 is ppo2 and 80% at some depth will give you the same ppo2 as >100% at 20 ft. However, for some reason that noone can really explain, 100% >at any depth works better for decompression than anything else, and we limit >100% to 20 ft. solely because of the ox tox risk when using it deeper in >water. In a chamber they put you on 100% at 60 ft as the standard >treatment. The ppo2 of 80% is not 1.62 at 30fsw. It's only 1.52. I think you misinterpreted my post. Arg! Baker's dozen so very well covers this, but I will make a feeble attempt: Given: In order to quickly decompress the slow tissues, you must maximize the gradient between the absorbed gas partial pressure and the ambient pressure of that gas. Now: a) If you have any of that gas in your breathing mix (in this case, nitrogen) you must ascend to the minimum depth possible to maximize the gradient. (ie/ 10fsw) b) The oxygen window is the partial pressure. (or so I've been told) And you want that as wide as possible, in other words, as deep as possible while minimizing the risk of tox. so: You can't have your cake and eat it too with 80/20. ---------------------------------- Kevin Connell <kevin@nw*.co*> NW Labor Systems, Inc http://www.nwls.com Res tantum valet quantum vendi potest. (A thing is only worth what someone else is willing to pay for it) ---------------------------------- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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