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Assuming the right flow rate up to 3.0 L/min (which is mil spec)
How do you reason that a pPO2 of 0.7 ATA does
not leave enough room to prevent hypoxia?

It's odd to find myself advocating more O2 - or
a higher pPO2 - but I count 0.7 ATA as three
times what you are breathing in Hawaii right
now. (This assumed you're not doing a 100% O2
surface break to get over your jet lag ;-)

Seriously, the Navy upper limit of 1.3 ATA was
just that. Remember that your reason for going
higher than 0.7 or 1.2, better nitrogen load, has
not been validated as a means to prevent DCI.
(Remember the look on Ed Thalman's face).

While an O2 hit can occur almost instantaneously
on exposure to a high pPO2, most occurred after "some
minutes. So I reason that if it's like other phsyiology,
exposure to 1.3 for several hours is a lot more risky than
say a 20 min deco at rest on 1.4. 

I think I'll stick at 0.7 for sport stuff and 
leave the hotter pPO2's to you guys in the
Twilight Zone :-))

best wishes

-ph

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