Mailing List Archive Mailing List Archive
a quicker way is to simply take the Fhe from 1, then mulitply that answer by your anticipated depth (Pata). You now have your AED in ata. Bill Bott wrote: > 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
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]