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Doug K> wrote:

That nitrox under 50% was not going to need specially cleaned tanks and would 
be marked with a temporary sticker (like a velcro) Of course this could only 
be premix
to avoid the 100% O2. Has anyone heard of this. I think it related 
to relaxed gas handling rules. 
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Here at NOAA, all of our Nitrox is premixed into banks of EANx32 or 
36. It's then decanted via haskel into dedicated nitrox tanks.  
Since the premixed gas is less than 40% O2, the tanks are not oxygen 
cleaned, or prepared for O2 service.

However, 

The air used to make the nitrox is pumped by an oil free compressor, 
and,

The mixing tank (storage tanks) are O2 clean, since they receive 
pure O2.

It has always been the presumption here that:
1. premix of less than 40% O2 does not require an O2 cleaned tank.
2. The only reason to use a dedicated tank for a mixture of less 
than 40% is to prevent confusion over its contents.
3. Nitrox of less than 40% dies not require a deticated regulator.  
The same regulator  can be used for regular old air.

Andy Cohen

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