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"Paltz, Art" wrote:

> Frank,
>
> Coming into this late so I apologize if I missed the point.  I think the
> real point of the initial question was why is NITROX mixing more
> dangerous than Tri-Mix filling?  I think most people know the dangers of
> mixing yourself if you don't know what you're doing, are careless, don't
> service equipment, etc.  Unless you're doing poor man's tri-mix
> (heli-air) then you're still adding O2 to the initial mix prior to
> toping with air.  I think in this instance the risks in filling are the
> same in regard to the O2.

I basically agree with you and Kevin. Its always better to have all things
oxygen
serviced. But when you start with EAN32 (transfilled from a cascade or donor

tank - not mixed in the tank!), add the helium and than the rest of the air
you get
around with normal gear as well.

For the typ of dives I am doing the advantages of having a ppO2 of 1.3bar
(ie. 'real' trimix) vs 0.9bar (heli-air) are limited to a few minutes less
deco time.

Regards

Frank


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