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Dear list,

Lets say I do a trimix dive followed by a nitrox dive. I'll use 14/50 for my
trimix dive, and some time later, I'll use Nitrox 21 for my second dive.

My tissues ongas Helium and Nitrogen during the trimix dive. During the deco
for this dive, the helium loading disappears quickly, so, effectively, the
limiting factor for final exit from the water becomes the nitrogen loading.

Using Buhlmann ZHL-16B, it appears that the oxygen fraction in the mix is
largely irrelevant (bear with me at this point!). In most implementations I
have seen, the Fo2 is only used to determine which deco gas to use (i.e. the
one which, if used, would not cause the selected Max PPo2 to be exceeded).
Also, the implementations I have seen simply add the He and N2 loadings
together.

Would the residual N2 tissue loading be the same after my mix dive as if I'd
dived the same profile on Eanx 64?

Could I consider the (equivalent) N2 gas loading only when planning my
second (nitrox) dive?

JT
--
John Taylor
CREDIT | FIRST
SUISSE | BOSTON
Equity Derivatives and Convertibles Unit
* +852 2101 6927 (Office)
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