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To: AHDNN1A.DDRAKE01@ed*.co*
Subject: Re: O2 fills
From: Ronnie Bell <rbell@cp*.or*>
Cc: "techdiver(a)opal.com" <techdiver@opal.com>
Date: Wed, 12 Apr 1995 20:17:41 -0400 (EDT)

In response to the "safest" way to mix nitrox in the field,I'd suggest the 
following. Calcluate how many PSI of O2 is needed, put in as much air as 
you can FIRST and still be able to put the O2 in. For example if you are 
mixing a 32% o2 mix and plan on ending up at 3500 psi you need to put in
about 487 psi of O2 and the rest air. So if your O2 tank has 1800 psi you 
could easily put in 1000 psi air, put in 487 O2 (ok 480) then top off 
with air to 3500. Obviously the higher the pressure in your O2 bottle and 
the lower pressure in your Nitrox tank are best combinations for this. 
That is one attraction of the low pressure steel tanks (steel 72s and 
pressed steel 104s).
Obviously you need to analyze your mix before you use it.
safe diving
r.b.

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