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Jeff,
Most agencies suggest and I agree as follows :
Tanks :
If exposed to more than 40% O2 during partial pressure filling - O2 clean
them and the valve. Otherwise don't sweat it. If you label it for NITROX
I would have it cleaned in any case - shit happens in dive shops !
Dedicate this tank to nitrox only or only fill from nitrox compatible air
stations and never let it out of your sight. If you keep this tank clean I
don't think it is necessary to have it cleaned every single year but some
shops will want to see a sticker .
Regulators: If used with 40% or less don't bother cleaning them. If
used with more than 40% mixtures - O2 clean them. The main purpose of this
is to get the bends and orafices in the first stage clean because they are
just like a fill station situation under high flows.
You might want to have a nitrox regulator checked yearly even if you only
use up to 40% just to keep any accelerated deterioration from sneeking up on
you.
Don't do this because any agencies say you should - do it to keep your
butt and the filler's butt in one piece.
Check the archives for lots of arguments on this issue - then play it safe
for everyone's sake.
Chuck Boone
--
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