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Andrew Cohen writes:

>     According to NOAA, who invented Nitrox, you may use a regular tank for 
>     nitrox mixtures up to 40% O2.  For mixes above 40 % the tank should be 
>     cleaned for O2 service and the valve should be cleaned for O2 service 
>     and should contain only O2 compatible soft goods and lubricants.

According to Glen Butler of Life Support Technologies (he spoke about this
at the N.J. Tech Symposium this week), the Compressed Gas Association (CGA)
guidelines for O2 cleaning are 23%, based upon scientific evidence.  The
40% number is solely for political purposes.

It would be interesting (and probably difficult) to find out how many
accidents or close calls there have been with systems that were exposed to
between 23% and 40% O2 that were not O2 cleaned.

After hearing Glen's presentation on air quality and O2 compatibility, it
really makes you wonder if some people understand the special care that O2
enriched systems require.

Christina Young

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