Dear Jun,
We use HP liquid N2 when our air compressors are down for maintenance, and
I've used them in the past when the compressor was down for an extended
period. So yes, it's feasible.
As far as how many tanks you should order, this will depend on consumption,
which can vary depending on how in-use the instruments are and how leaky
your system is. I would go through at least 1 tank/day where we have 3
magnets with 2 cryoprobes, though I know I had at least one leaky spot in
the system. If you are able, not using the temperature control on your
IProbe system during the shutdown will reduce N2 consumption significantly.
We have another site where our house N2 has been down for almost a year and
we run exclusively with HP liquid N2. It's a 400 with a SampleXpress and an
IProbe. If we use temperature control, we can go through 1 tank in 4-6
days. If temperature control is off, the tank can go much longer. This
magnet isn't as busy as our others, though.
I strongly recommend the 'tee' with 2+ tanks idea. And if you can, this is
a good opportunity to build/engineer a system for your house N2 where you
can swap easily from house to tanks and back, in case the house system
needs to go down again. The cryoprobes will warm up if the air supply
drops, so have a quick switch-over is really helpful. One other thing to
keep an eye on. As the tank delivers N2 gas, the exterior will get cold,
and the liquid and vent valves on top of the tanks may start to leak
nitrogen. You'll want to keep an eye on them to make sure they don't open
as the top of the tank cools. If they do, put on a cryoglove and tighten
them down.
Best of luck to you!
Peter
On Wed, Oct 16, 2024 at 1:57 PM Gu, Jun via groups.io wrote:
> Hello All,
>
> There will be a house nitrogen shutdown for 3 day in my building. To keep
> the NMRs available for research, I am considering using high-pressure
> liquid nitrogen tanks to supply three spectrometers with SampleCase: (1)NMR
> with a IProbe and BCU I, (2) NMR with a Prodigy probe and BCU I, (3) NMR
> with a Helium-cooled probe (no SampleCase).
>
> Is this approach feasible? How many liquid nitrogen tank should I order?
> I would greatly appreciate it if anyone could share their experience or
> advice.
>
>
> Best,
>
> Jun
>
>
>
--
*Peter Thompson, Ph.D.*
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Innovation Center (METRIC)
Research Assistant Professor, Department of Molecular and Structural
Biochemistry
North Carolina State University
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Raleigh, NC 27695
Phone: 919.515.0836
Email: pmthomps_at_ncsu.edu
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Received on Fri Oct 18 2024 - 11:26:43 MST