If your EAN cylinder gets filled with air does if have to be O2 cleaned before refilling with EAN36?

+1 vote
asked Aug 28, 2018 in Scuba Diving by George1224 (5,147 points)

1 Answer

+3 votes
answered Sep 3, 2018 by Scubachuck (1,093 points)
It depends if the filler(dive shop) is using partial pressure blending or using a membrane nitrox system.  Partial pressure blending consists of adding pure O2 to the tank and then adding air to determine the final EAN percentage. Because the tank receives pure O2 first the tank must be O2 cleaned .
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