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O2 goes down in the loop because it is metabolized in the body to CO2 which is removed by the scrubber. N2 remains in the loop but as you surface during deco the ambient pressure decreases so your body will not reabsorb the excess N2 that is offgassed into the loop. Plus, during ascent the system will vent gas due to expansion because ambient pressure drops and so you lose some N2 that way. The best way is to take a breath from the rebreather and vent gas through your nose to the water and not put it back into the system. Do this for a few breaths to completely dump the counterlung and then refill it manually with deco gas or whatever. This way N2 keeps going out. Depending upon the length of deco you need to dump the counterlung probably only once or twice at the most. Rod On Tue, 19 Dec 1995, Marc Dufour wrote: > > Date: Tue, 19 Dec 1995 08:24:01 -0800 > > Subject: Re: Rebreather from stab jacket (was: Re: A.P. Valves bcd) > > From: Kevin-Neil Klop <kevink@ap*.co*> > > To: <SATURN.DDRAKE05@gm*.co*>, "techdiver(a)terra.net" <techdiver@terra.net> > > > >David B. Drake EDS/SATURN Infrastructure 8-320-4190 on GMnet Spring > > >Hill, TN USA Internet: saturn.ddrake05@gm*.co* > > > > > >P.S. How do you get rid of the inert gas buildup in a completely closed > > >rebreather system when doing IWR. I assume the amount of Nitrogen/He that > > >will come out of your body will be more than significant to the size of your > > >counter lungs and reduce off-gassing efficiency... > > > > This is handled through a very simple expedient. You must "purge" the > > system at regular intervals in order to keep the inert gas ratio at a > > reasonable level. I forget what the interval (and it may be different > > for various rebreathers). > > Would not it vent itself automatically as oxygen is added to the > breathing bag when the ppO2 goes down? > > --------------------Pour la Republique Francaise du Quebec-------------------- > The fact that the Communists won the elections in Russia show how the *PEOPLE* > think about the "system" the rabid entrepreneurs have been shoving down their > throat. It also shows that when you run around with a MBA in one pocket and > an adding machine in the hand (an MBA brain obviously can't handle anything > more complex than addition), you have tremenduous farsight. At least, the > bureaucrats don't make false promises and spew bullshit all over. > - Marc Dufour - [\] ACUC 6 31874 - TDI CD-0197 - http://www.accent.net/emdx - > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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