One important thing to realize is that Cryomech and any other helium
recovery system manufacturer is selling you a system to recover helium, but
will provide little or no information on how to safely connect it to your
NMR magnets. I'm sure smarter people than me will provide details, but I
can see that there are missing back pressure regulators at each magnet, 1
psi relief valves at each magnet, if not more. Make sure you get detailed
information on how to safely connect your magnets to a Helium Recovery
system. Here are a couple good primer videos.
https://youtu.be/IQSug-0FgpI?si=idLuZntHgFx2KIh4
https://youtu.be/K_qkAC4B3_0?si=jGLHnQ6cv-H87Z-Q
On Wed, Sep 6, 2023 at 2:49 PM Yuan Yang <yuanyang_at_mines.edu> wrote:
> 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 <yuanyang_at_mines.edu>
>
>
>
>
--
Ken Sharp-Knott
Manager of Analytical Services and the NMR Facility
Department of Chemistry
Virginia Tech
(540)267-6502 (Cell)
(540)231-0885 (Office)
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#542): https://urldefense.com/v3/__https://ammrl.groups.=
io/g/main/message/542__;!!PvDODwlR4mBZyAb0!RdlNPWH3x771d2jdPXrDnjYJuIaNzsTM=
LlxSEwfwImlDXpel75DFzlZ-50u3It_cHhTNPkj9b66nkQ$
Mute This Topic: https://urldefense.com/v3/__https://groups.io/mt/101199948=
/7559972__;!!PvDODwlR4mBZyAb0!RdlNPWH3x771d2jdPXrDnjYJuIaNzsTMLlxSEwfwImlDX=
pel75DFzlZ-50u3It_cHhTNPkjxQhtBxg$
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
Received on Wed Sep 06 2023 - 11:54:50 MST