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> -----Original Message-----
> From: Jeroen [mailto:jeroen@pi*.co*]
> 
> Until a few years ago all the tanks around here had a working pressure
> of 200 bar, with a test at 150% of that: 300 bar.
> 
> People generally just filled their tanks to the maximum a compressor
> would do: 225 bar, since that is the setting of the overpressure valve
> on most 200 bar compressors.
>  
> So someone came up with a 232 bar tank, which has a test pressure of
> 350 bar (again 150%). Those are the ones normally sold these days,
> but of course people also still use 200 bar tanks, which are indeed
> quite commonly overfilled.
>  

Here in "good ol' Germany" (home of the DIN), even that new tanks 
are rated (stamped) 200bars, cause things changing very slowly in 
that logheads. 
Steel tanks must be vis inspected and hydroed (by the TUV org) 
every 2 years.

But the biggest CF is the O2 regulation: Since there is no special 
law for diving applications, other common regulations have to be 
obeyed.
So, every mix above 21% requires fully O2 compatible equipment 
(high pressure O2 tanks, O2 treads at the valves, O2 comp. regs...),
rendering Nitrox diving virtually impossible (without breaking laws).

I.e. take your Halcyon double 104's with 300bar DIN manifold to a 
German dive shop, and probably you won't get a Nitrox fill. ;-(

/Thomas.

<frustrated and slightly OT>

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