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Pat Murphy wrote:

>Just one point here. You can dive Nitrox mixtures of up to 40% O2 without
>going thru the expense of O2 cleaning your regulator, spg, etc. You _WILL_
>need to provide (or rent) an O2 cleaned tank, however.

A question I asked on my Nitrox course (IANTD Technical Nitrox) was "Why is
the limit 40% O2?".  Is there (WRT equipment) a difference between diving a
Nitrox mix near the limit  and diving air at a greater depth? The ppO2 could
be the same in each case, and as far as i know O2 is the only thing that
affects combustion - the N2 is just there to get in the way.  So, should air
divers be taking more care. or are Nitrox divers just adding an extra
element of caution. Or is it perhaps that the FO2 may be more important for
combustion that the ppO2.

The course instructor sort of bluffed his way round it, passing the buck to
the equipment manufacturers. Can anybody enlighten me?

Keith
hadlandk@lg*.lo*.co*

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