Hello all,

      For the past several years our Delta Plus has been fed by compressed
air from a building compressed air system.  This has been very stable until
the past few weeks.  We are trying to design a back up system that may at
least give us enough time to finish a run or shut down the machine, etc.  We
are looking into using a N2 or compressed air tank plumbed into the line
along with "check valves" to act as an automatic backup supply of ~60 PSI
air pressure (see attachment).  Basically, when the building PSI gets too
low, the valve to the backup tank will open.  Has anyone set up such a
system?  If so, I'm assuming Swagelok makes valves that will work for this?
 What type of tank is used...N2, compressed air cylinder, a ballast tank? 
How long has this setup kept the machine operational.

Any thoughts would be appreciated.

Joe Lambert

Alabama Stable Isotope Laboratory
The University of Alabama
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