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For the temperatures and pressures that we as divers are involved with,
the main reason for the 40% O2 limit is to do with the ppL2 where L2 is
the square of the number of lawyers in a 100 mile radius. The secondary
reason is as you assumed to do with the FO2 not ppO2. It is worth remembering
that pure O2 is used for welding, garages have a lot of grease around and I
have never heard of an explosion in a garage caused by grease, dirt and O2.
Have you?
In message <2E58A826@sm*.lo*.co*> Hadland Keith writes:
>> 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.
|_| _ _ _ < Internet : harry@ra*.de*.co*.uk*
| | (_)_ | | |_| < CI$ : 100141,1632 <Harry Railing>
| < Snail : 90 Balham Grove, London SW12 8BE, UK
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