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Jsuw, In answering this question I'll assume that you already know how to do END calculations. If that assumption is incorrect e mail me privately and I'll try to help you Now as for handling O2 as a narcotic gas... The calculations are actually simplified!! Calculate the PPO2 and the PPN2 for the given depth and add the two numbers together, then subtract 1 and multiply by 33. ((PPO2+PPN2)-1)*33 For example take a dive to 265 using 14%O2 41%N2 45%He. At depth the pressure is 9.03ATA. The PPO2 is 1.26ATA, PPN2 is 3.70 and the PPHe is 4.06. For our purposes the He does not matter. Add the O2 and the He PPs, you come up with 4.69. Subtract 1 you get 3.69. then multiply by 33 you get 130.7FSW. ((1.26+3.70)-1)*33=130.7. Note that if you are using Nitrox the END is the actual depth you are at if you consider O2 as a narcotic gas! He can be ignored untill you start runing a risk of HPNS but that is a whole topic of its own!!! Other gasses like Ar, H or Ne have different properties and only serve to complicate the math. Hope this helps you, At 10:36 PM 12/29/98 , Jsuw@ao*.co* wrote: >When determining the acceptable narcosis exposure for a dive, it seems that >only the narcotic effect of nitrogen is considered. Oxygen is at least as >narcotic as nitrogen. Although helium is far less narcotic than either, it >still is an inert gas with potential to have narcotic properties. > >With this in mind, why is it that only nitrogen's narcotic effects are >considered? How can the narcotic effect of the other gases be accounted for? >Does it matter? > Bill (aquadart) Bott
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