helium

Subram Chandrasekar (chesec@gsusgi1.gsu.edu)
Mon, 28 Feb 1994 10:35:38 -0500 (EST)

I thank all the NMR managers for responding to my question last week about
air supply to the 600, 500 and 300 NMR systems. Experiences with air supply
seem to range from using boil-off from huge liquid nitrogen tanks to using
house compressed air with the appropriate filters to remove oil and water.
Balston air dryers are the most highly recommended.

I have another question I would like to ask the AMMRL NMR managers. This
question has to do with helium transfers to the 600 and 500 magnets. These
two magnets will be located inside pits. What we are planning to do is to
bring the helium dewars at the room ground level (not inside the pit) and do
helium transfer from the room ground level. This would situate the dewar
about 7 to 8 feet away from the magnet. My question is whether there are
helium transfer tubes long enough to accomadate this distance (7 to 8 feet)
and whether this type of transfer is feasible. Are there any other better
ways of doing this helium transfer? I would very much appreciate receiving
your answers, opinions and suggestions sent either to the AMMRL or to my
e-mail address which is CHESEC@GSUSGI1.GSU.EDU
Than you.

S. Chandrasekaran
NMR Facilities Manager
Department of Chemistry
Georgia State University
Atlanta, GA 30303