Helium recovery systems

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Hello,
We are under pressure to recycle our helium. Our supplier (Physics) uses 
about 1000 L of helium per month, most of which is recovered. They would 
like to put our seven magnets on their recovery system - three are Oxford,
  two are Varian R2D2 and two are Bruker. Has anyone had problems with 
helium recovery systems? They mentioned "compressor noise" through the 
helium affected a couple of their supercon systems. Would the changing 
pressure of the helium line affect the fields of the magnets? They say it 
is about 3 inches water pressure.

I did a search of the AMMRL archives, but didn't turn up much. If I get 
enough responses about helium recovery systems, I'll post a summary.

Many thanks,
Tim
--
Timothy Burrow, Ph.D. NMR Services
University of Toronto 416-978-5728
http://www.chem.utoronto.ca/facilities/nmr/

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