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uunet!elde.epfl.ch!walz (Michael Walz) wrote:
>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 ?
>

I am assuming here "poor man's set up" (my own definition): you have an air
compressor, but you buy He (and O2) in tanks from a supplier.

Even if your air compressor had an inlet that you could feed from the He tanks,
you would probably waste a lot of gas in flushing out the air, then flushing
out the He.

Wrolf

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