----- Original Message -----
From: "Randall Clague" <[EMAIL PROTECTED]>
> Yes indeed. 1 atmosphere air. But in terms of flow rate, it makes no
> difference. You inhale by volume, not by oxygen content, so if you inhale
> 1 liter at the surface, you'll inhale 1 liter at 100 feet. You'll be
> getting 4 times as much gas, including 4 times as much oxygen, as you
would
> on the surface. So your kg/min will be higher, but your liters/min will
be
> the same. That's my understanding anyway, from drilling my brother when
he
> went through all those damn PADI certs.
This is all true but it doesn't answer if the 1st and 2nd stage are limited
by weight or volume. I'll look it up. When they test regulators they test
them at depth to verify they still flow enough.
>
> >Getting an airfill at DDWP is about $5. The occasionally have used
Catalina
> >80s for about $70.
>
> $70 for a refill?!
No of course not :-) I just said $5, right? $70 is for a used 80 CuFt tank
(3000 Psi).
Sander
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