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Wrolf wrote:

[stuff deleted]

>Mixing is easy - for a 3000 psi tank, add 1311 psi He, and top off with air.
>(Call it 1300 psi).  Analyze for 12% O2.  If too low, let out some mix
>and add more air.   Start low - it is harder to add the He, since presumably
>you have a compressor, but your He tank may be at a lower pressure that
>your fill pressure.

[stuff deletef]

What's the problem if your He tank is at lower pressure than your fill 
pressure ? What prevents you from pumping He through your compressor ?


Michael Walz
walz@el*.ep*.ch*
walz@la*.ep*.ch*

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