Dear Helium Collectors,
Our helium recovery system has three 30 m 3 bags that are connected with 47.5 mm
ID stainless steel tubing running at floor level along an outside wall. See
our homepage
https://nmr.ccrc.uga.edu/; in the background picture, 2 are
hidden behind the magnet on the right, the third to the left. The two are
about 50 & 75 feet away from the compressor while the third is another 150
feet away. As can be seen they are suspended from a bar at the top. The gas
connection is at floor level. Not surprisingly, they never empty (I don’t
expect or want complete emptiness) as the helium makes a bulge at the top,
but the bottom is sucked closed. I have observed that the bag furthest away
never drains as much as the two closest to the compressor. There are 3 magnets
that are upstream of this bag. I worry that this bag might be might be a
greater source of impurities than the closer ones since the helium it collects
is not exchanged as rapidly as the other 2 bags. Does anyone else have a
similar setup where some bags are closer to the compressor than others? If
so, is my hypothesis valid? Are there any special cautions I should take
for this bag such as pumping it down and closing it off when I do not
need the extra capacity?
Thanks,
John
John Grimes
Complex Carbohydrate Research Center
University of Georgia
315 Riverbend Road, Athens, GA 30602
jgrimesjr_at_uga.edu
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Received on Mon Jul 21 2025 - 16:07:10 MST