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----- Original Message ----- From: Christopher Brown <hokiediver@ya*.co*> > Okay, Don: > > I got a question for ya. You said: > > > Nitrox is a non-issue since I would expect excessive > > oxygen pressure to > > prevent _any_ gas from leaving the tissues. > > Are you saying the absorbed 02 in the tissues would be > of such high pressure that no N2 would be able to > leave the tissue and enter the bloodstream? No, by _any_ gas I meant nitrox, air, argox, hydrox, heliox, trimix or filtered fish farts. There's nothing special about nitrox in this case. I could have made that clearer. Nice catch. > > My knowledge of deco theory is quite limited, but it > is my understanding that if a diver has a gas absorbed > in his/her tissue, it is the relative GRADIENT that > determines the rate of offgas. If a tissue has a high > PO2, and the bloodstream does not, the 02 goes from > the tissue to the blood. If a diver is breathing > nitrox, how does excessive 02 prevent N2 from leaving > the tissue? See above. Also note the use of the term "ambient pressure" in the original message. Pressures above what is required to keep the diver from getting bent, will slow your deco. If it didn't, you could hang out at the deep stops and skip shallower stops without penalty. Here's a zplan example for you: 200 minutes at 100 feet on air requires 14 minutes at 40 on EAN50 26 minutes at 30 on EAN50 29 minutes at 20 on 100% 56 minutes at 10 on 100% Making the 40 stop a waypoint lets you overstay the stop. I have to go to a 42 minute stop at 40 to make the 30 foot stop go away. That's an extra two minutes because we wouldn't let the pressure drop... and a CNS penalty for no good reason. > You can post this to the list if you want, I just > didn't feel like playing with the approval and the > wait... Away it goes. _____NetZero Free Internet Access and Email______ http://www.netzero.net/download/index.html -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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