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To: HadlandK@LG*.LO*.CO* (Hadland Keith)
Subject: Re: O2 Cleaning Limits (was Borderline Technical Training)
From: story@be*.es*.sg*.co* (David Story)
Cc: techdiver@opal.com
Date: Mon, 22 Aug 1994 11:00:17 -0800 (PDT)

Hadland Keith writes:
> 
> A question I asked on my Nitrox course (IANTD Technical Nitrox) was "Why is
> the limit 40% O2?".  [...]
> 
> The course instructor sort of bluffed his way round it, passing the buck to
> the equipment manufacturers. Can anybody enlighten me?

I believe that 40% O2 was the maximum FO2 used by NOAA for uncleaned
cylinders, and folks just copied that.  Morgan Wells mentioned that at
the '90 ('91?) AAUS Symposium in Hawaii, and also mentioned that NOAA
had been using 50% O2 without cleaning, but didn't admit it.

Cheers,

David Story                        	        Silicon Graphics, Inc.
story@sg*.co*					Mountain View, California

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