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You wrote: > >Tom, > >One minor nitpick. Looking at the IANTD limits, and plotting them out, >they are NOT linear. Plus it is obvious that IANTD is following >NOAA's technique of bundling both CNS and OTU's into the same >limits (ie, you cannot be serious that there is a CNS limit below >1.0 ATA., and especially at PO2's down and around 0.6 to 0.5 ATA - >you are showing approximatley 6% of the CNS limt per hour at 0.6ATA, >which works out to approximately 100% of the limit at somewhere around >16-17 hours. Patients have been on PO2's at these levels for multiple >days without ever having any symptoms of CNS toxicity - but pulmonary >tox becomes a problem). > >Would you care to explain further????? > > >John >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > John, The value I posted are the exact numbers we developed our charts and tables from. When we published the tables and charts we did so in a linear manner. Thus if you compute the exact value of the numbers I posted and compare them to the CNS% tables/chart we published they will differ. Our tables and charts will be more conservative. The reason we ran the numbers all the way to 0.6ATA. is to be able to complete a graph for calculating the values. I agree I do not think there is a risk below 1.0 ATA and most likely 1.3 so long as a o2 or high EANx deco does not follow the exposure. We also track residual CNS % and use a 88 minute halftime to do so. I think Bill Hamilton uses a 75 minute half time. We elected to remain conservative as this is all more or less assumptions. As you know until the CNS% tracking was produced most of us dived based on OTU limits and you can CNS tox long before the OTU's effect you. As a general rule for up to 6 continious days of diving if one does not exceed the CNS% clock they will not violate the OTU's. We use Bill Hamiltons Repex for OTU tracking at this time. Tom
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