Hello Alvaro,
I tee in a 20 mbar Technoflex relief valve at the inlet of the heat exchanger
used to warm the recovered gas for fills of non-pumped magnets. For our
pumped 2K magnets, I tee in a 50 mbar Technoflex valve at the same spot. I
find that I don't really need a flow meter to warn of the fill endpoint when
using these relief valves. Pressures generated at the end of the fill
cause the relief valve to open indicating the fill is over. These Technoflex
valves are identical to the ones found on the helium exhaust ports of Bruker
2K magnets. They can be purchased from Bruker. If someone knows of an
alternate source in the U.S., please share. Full disclosure: I am not an
engineer. Please take this advice at your own risk. At this point, your
magnet vendor should also be able to offer formal advice.
I will also point out that I disconnect the other magnets from the recovery
system before capturing helium from a magnet fill. This, even though I have
0.5 psi relief (tee'd in) and one-way valves downstream of each magnet exhaust
from which I am collecting the boil-off. I worry that pressure changes may
cause the fields of some of our magnets to wonder. Plus, it just seems a lot
safer.
regards,
-Dusty Baber
------------------------------------------------
James (Dusty) Baber
LCP/NIDDK/NIH
Bldg 5, Rm B1-01
5 Memorial Drive
Bethesda, MD 20892
Office: (301) 402-7239
e-mail: jamesbaber_at_niddk.nih.gov
------------------------------------------------
________________________________
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of Alvaro Herrera <herrera_at_auburn.edu>
> Sent: Monday, November 6, 2023 12:22 PM
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: [EXTERNAL] [AMMRL] Helium recovery during refill
Good day to all,
We are considering the implementation of a Helium capture and reliquification
system for our facility. A question has arisen regarding the possibility of
using a system that can capture helium during refills. If any of you have
experience with such systems, I am curious about your approach to managing
the pressure during refills. Your insights and information would be greatly
appreciated.
Thanks
Dr. Alvaro Herrera
Director NMR Center
Chemistry & Biochemistry Department
Auburn University
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Received on Mon Nov 06 2023 - 11:48:24 MST