Isn't trimix made with O2?
Ya, typically 21% or less.
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Isn't trimix made with O2?
Sigh. You just aren't getting this. It's simple, so I'll try again.
There's nothing the store is currently doing that keeps someone from getting an air fill there (just regular, good old air, into an empty cylinder), THEN LATER going and mixing O2 into the same cylinder (for trimix, nitrox, airgon, whatever).
They'd face the SAME liability under your scenario where something happens and someone goes looking to blame another. Even in this case where no trimix is implicated, you could still try claiming they contaminated your cylinder for future O2 blending purposes.
Of course, the defense is simple: I gave them an air fill, what they did later is none of my concern.
Actually what you did is introduce non-O2-clean air into a cylinder that had an "O2 Clean" sticker on it, rendering it no longer O2 clean.
LOL.
Again, if your air is so dirty to pose combustion issues in the presence of pure O2, then really, you shouldn't be letting people breathe it. It's that simple.
Where was it established that the tanks in question are O2 clean? Trimix fills don't require clean cylinders, if that's what you're thinking.
This typically isn't done in this order because it's easier to get the O2 (and I assume the helium) into the tank when it's empty.
Actually what you did is introduce non-O2-clean air into a cylinder that had an "O2 Clean" sticker on it, rendering it no longer O2 clean.
I'm not trying to be dense here, AFAIK, but the OP doesn't have air that's certified for use in PP blending, which makes filling an O2 clean tank a problem, regardless of what it currently contains or will contain.
Now if the customer's tank isn't O2 clean (maybe he's blending trimix using banked Nitrox?) then it doesn't matter if the op fills it or not.
Terry
Greetings - I teach at a dive shop in San Diego. We only do air fills (no Nitrox or Tri-mix). Recently a couple of Tec Divers came into the shop with these massive doubles filled with Tri-mix, and wanted us to top them off with air.
The question came up on our side about liability, whether it's safe, etc. I'm sure you could have them sign some kind of waiver, but I'm curious what other's thoughts might be on this in terms of risks or liabilities? Do other shops do this?
Thanks in advance,
Marcus Gee
PADI MSDT #235938
That's exactly what I was thinking. I've never seen it made except by PP blending.
Terry
There's no rule that the O2 has to go in before the He.