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Narced wrote:

> But I was taught a specific set of guidelines for having Nitrox (no
> expereince with trimix, but I suppose the same guidelins could be applied)
> tanks filled.  I deliver my tanks to the store, and empty the gas that is
> left in them.  I dial-a-mix and watch them get filled... After their
> filled, we shoot the shit and let the tanks roll.  We then anilyze the
> fo2,
> twice.  Slap some duct tape on with the fo2, and mod. 
> 
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For Nitrox fills on top of nitrox gas, why would you need to empty the
remaining gas ? Why can't you analyze for the FO2 in the remaining gas,
calculate the O2% remained, pump in additional O2 (if needed), top off with
air ?

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