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I feel the proverbial dead horse is getting beat more and more with this 
topic, so this will be my last post on the subject.  I stand corrected on the 
statement of leading theoretical tissue compartments (thanks Bill, your posts 
were very informative.)  My original post about one on gassing more Nitrogen 
using EAN36/EAN80 as deco gasses stands.

Upon comparing the leading & intermediate tissue compartments for each of the 
dive scenarios, the same thing is revealed.  The partial pressure of Nitrogen 
in the leading and intermediate tissues on EAN36 @ 110fsw is greater than the 
counterpart on 18/35 @110fsw and the one using EAN36 considerably slows his 
off gassing of the "culprit" gas.  The Decoplanner analysis says on the 
bottom mix the diver is off gassing Nitrogen @ -26.9 and when the diver makes 
his switch to EAN36 he is off gassing @ -7.7. (Exact #'s vary according to 
pref. settings.) This is characteristic of the rest of the dive: one deco-ing 
on EAN50/Oxygen on gasses less nitrogen than the one deco-ing on EAN36/EAN80 
and the nitrogen the EAN50/Oxygen diver does on gas is off gassed faster.

The extra few minutes of deco on the EAN50 @ 70fsw/Oxygen @ 20fsw comes from 
the extra Helium the diver breaths by not making the switch to EAN36.  Since 
Helium is not as hard on one's body like Nitrogen is this is acceptable.

At the end of this example dive, a diver is better off for having used 
EAN50/Oxygen as his deco gas because he has less Nitrogen in his body.


Best wishes to you,
Allyson Clagett


In a message dated 08/29/2000 3:53:46 PM Eastern Daylight Time, KRussellTX 
writes:

<< Allyson,
 
 Please explain the significance of the number of theoretical compartments 
either on-gassing or off-gassing, verses the one theoretical compartment that 
happens to be controlling the deco at any one particular time.
 
 Karl
  >>
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