Is it really the case that the compressor on this setup does not turn on until
the line off the magnets reaches a minimum of nearly 2.5psi/175mbar over atm?
That seems very high for being used as a routine threshold. At what pressure
is the compressor set to shut down and what are you using or plan to use for
a backpressure setting? 200mBar?
Regards,
Scott
From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Yuan Yang
Sent: Wednesday, September 6, 2023 2:25 PM
To: main_at_ammrl.groups.io
Subject: [EXTERNAL][AMMRL] CryoMech Compact Helium Recovery System
We have been attempting to setup a CryoMech Compact Helium Recovery system
(Low Pressure System No Bag). We are attempting to perform a transfer and
capture the helium during a transfer using the CryoMech system. The issue we
have is both our Bruker system and our JEOL system have pressure relief valves
that are set to relieve at at around 1psi of dewar pressure. The CryoMech
system will not capture / compress the helium gas unless it is at or above
2.5psi. Due to this discrepancy we are currently not able to capture the
fill cycle portion of helium.
Does anyone have a helium recovery system (Cryomech or other) that does not
incorporate a low pressure bag, but instead goes directly to a low pressure
(2.5psi) metal buffer tank?
If someone does have a similar type system could you share how you get around
the low pressure reliefs on the magnets and any additional information you
might have about your specific system?
To summarize our setup, we have the following:
LHEP15 Liquid Helium Plant (With PT410 Cold Head Option)
150L Helium Dewar Part of Helium Plant
CPA289C Water cooled Helium Compressor
1 Low Pressure 2psi Buffer Tank (30” Diameter x 52” High)
6 Storage Tanks Same dimensions as above. (Ea tank can hold the equivalent
of 4L of Helium Gas Compressed to 100psi)
1 Mini Purifier Assembly Cooled By LN2
1 Control Box
The systems we are attempting to recover helium from are the following:
1 JEOL 500Mhz Liquids NMR System (With A Jastec Magnet 120L LHe Volume)
1 Bruker 400 MHz Solids system (Bruker Magnet with approx 103L LHe Volume)
--------------------------------------------------------------------------
Yuan Yang, Ph.D.
Research Associate Professor
NMR facility manager
Department of Chemistry
Colorado School of Mines
Golden, CO 80401
Phone: (303)384-2109
Email: yuanyang_at_mines.edu<mailto:yuanyang_at_mines.edu>
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Received on Thu Sep 07 2023 - 11:04:23 MST