Our 900 was in a separate building with a dedicated bulk LN2 tank to supply
VT gas etc. as well as for a liquid nitrogen filling station. The filling
station was about 20 feet (~6 meters) from the bulk LN2 tank. The filling
station required the installation of oxygen sensors and emergency cutoffs
in case of issues. The system was only used for filling the 250L LN2 dewar
for magnet fills. I was not involved in the initial install nor design. Its
operation was so bad due to the way the piping was done [the pipes were routed
up 15 feet (~4.5 meters), across the 20 feet, and down 15 feet)] that the
previous lab manager never used it in 4 years. When I took over, we couldn't
reroute the piping, but could install a priming bypass to precool the lines.
This helped, but it still took around 2-3 hours to fill the 250L dewar. I
think the problem was the vertical routing of the pipes. We could never get
enough pressure to ensure an adequate flow. We have a similar system in our
chemistry building and a 240L LN2 dewar takes around 30 minutes to fill.
Dan Holmes, Ph.D.
Director, Max T. Rogers NMR Facility
Michigan State University
East Lansing, MI 48824
(517)353-1165
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Received on Wed Jun 07 2023 - 11:13:44 MST