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In a message dated 96-04-12 12:00:56 EDT, DUNCAN@fs*.ph*.ma*.ac*.uk* (Duncan
Mercer) writes:

>It seems to me that for EAN mixes greater than 60% O2 
>(corresponding to 50% air 50% additional oxygen)
>it might make more sense to add the O2 to the tank last. This would 
>generate the maximum "mixing effect".
>
>

Pumping oxygen at higher pressures increases risks when compared to pumping
it at lower pressures, hence we fill oxygen first. Secondly, with regard to
nitrox mixtures, the "gases" are "mixed" immediately at the time of the fill.

Safe Diving,
Bob Raimo.

April 13, 1996
9:14 pm

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