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I think the problem is the lower compressibility 
of helium. My experience with boosting helium
through an air compressor is that it heats excessively
at higher pressures. I assume that helium gives a
higher resistance and that the rate of compression
(stroke volume/ volume pr. minute) should be different
for helium. The compressor needs a lower shift! The higher heat conductance of
helium
makes little difference -- the main thing is that
the compressor has to work harder to compress it.

Input from engineers/ physicist welcome!
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