Hey Chris,
We have one of Quantum Tech's bagless systems installed covering an 850, 700,
600, 2x 500 and 400 MHz spectrometers. The 850 is a pumped system and we
were concerned with over pressure of the smaller systems. Quantum-Tech worked
with us and configured their system where the lower boil-off magnets would
feed directly into the liquefier and therefore would not be affected by the
higher boil-off systems. The system has been up and running for a few years
now and works nicely. It's also nice that it's a bagless system so we do
not have to worry about impurities working their way in. We do still have a
purifier because we have another NMR core across campus that does collect
using a bag. We're all very protective of our systems and don't like to put
them under undue stress especially those that have been at field for 20+ years.
For the 850 pumped system what I have found is the BMPC does not like it when
the helium plant recovery pump is running during a transfer or a fill and does
go into alarm and fires up the second pump. To prevent this from happening we
fitted a toggle switch so I can just move it to vent to atmosphere until the
transfer/fill is done then switch it back to capture.
If you need any more info just let me know.
Stu
-------------------
Stuart Parnham Ph.D.
Biomolecular NMR
Marsico Hall, SB205A
University of North Carolina
Phone:(919)-966-6184
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Fares, Christophe via groups.io
> Sent: Sunday, January 28, 2024 3:09 PM
> To: main_at_ammrl.groups.io
> Subject: [AMMRL] "bag-less" helium-recovery
Dear Community,
I was wondering if there is anyone out there willing to share their experience
with the He-recovery systems like the one from Quantum Technologies (Picasso/ "All-metal")
---- or similar? --- which have the characteristic feature that they works without a
"balloon" to collect He. Instead, the He boil-off is directly purified and re-liquefied.
In case of high flow (eg. during fills), a compressor switches on and stores excess
flow to a medium pressure container for later recovery. The advantages are the smaller
space requirements and the helium reaching the purifier less contaminated.
But perhaps there are obvious downsides which I am not seeing, especially since this
solution does not seem to be widespread.
Best regards
Chris
---------------------------------------------------
Christophe Farès, Ph.D.
---------------------------------------------------
NMR Department/NMR Abteilung
Max-Planck Institut für Kohlenforschung
Kaiser-Wilhelm Platz 1
45470 Mülheim an der Ruhr
Tel: +49 208 306 2130
E-mail: fares [a] mpi-muelheim [.] mpg [.] de
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Received on Wed Jan 31 2024 - 06:19:10 MST