Good morning,
Here are a few pictures of how our magnets are connected to the QT system.
For the Brukers we were able to support the piping in such a way that their
relief valve was not moved. For the Oxfords, the existing valve, which in
the past would have been removed during helium fills was moved so that tygon
tubing carrying the passive boiloff around the ball valve goes through it,
but it is out of the path of the fill boiloff. I am fairly sure all our
magnets had some sort of check valve on them, so we did not add any…
Our normal header pressure is ~0.2 psi, this is indicated at the recovery
system control about 150-200ft away from the chemistry lab. We fill the magnets
at the same pressure that has always been used. After the initial burst, which
usually causes the 0.45 psi relief valve at the magnet to go as the recovery
compressor turns on, the header pressure settles at about 0.3 psi for the
length of a fill. For the few magnets that have a reliable level meter reading
that is used to determine when the fill is complete, for the rest it is a
combination of years of records of how long it takes to fill the magnet from
what level and watching the header pressure (we remotely logon to the HMI
controller). When the header pressure starts to go up, the fill is stopped.
Again at the end the 0.45 psi relief often goes off a few more times as the
transfer line is removed. For the pumped 800 we stop at ~95% so there isn’t
any rise in backpressure at the end, and the transfer line has a shutoff in it.
The fills have been done like this for 4 years now, and as far as I am aware
there has never been an issue like you describe.
The main flex line and header are 2”, but there is a cobbling of
different sizes together right at some of the magnets to be able to make
the connections without putting force on them.
Good luck figuring this out.
Tara
*********************************************
Tara Sprules
0.6 FTE, Working days: Monday, Wednesday and Thursday
QANUC
Quebec/Eastern Canada High Field NMR Facility
http://www.nmrlab.mcgill.ca
phone: (514) 398-1721
fax: (514) 398-8254
3420 University St., Rm 023
McGill University
Montreal, QC, H3A 2A7
SHIPPING ADDRESS:
Department of Chemistry, McGill University
Rm. 41 801 Sherbrooke St. W
Montreal QC
H3A 0B8
*********************************************
> From: main_at_ammrl.groups.io on behalf of Fulton, Luke via groups.io
> Date: Saturday, April 19, 2025 at 7:19 PM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Quench narrowly avoided? Filling small magnets connected to helium recovery
Hi all,
Pictures attached as promised. The 300 already had a check valve on the helium
stack before connecting to recovery manifold. The valve on the 600 was added in
preparation for the recovery system. Having the check valve at the exhaust port
led to too much torque on the system. Moving the valve in line with the manifold
and whip relieved the strain.
Copper tubing shown is 1.5".
All flanges on the manifold are KF25. Whip to copper connection is KF40.
The barb hose flange adapters have a smaller ID than intended from a
miscommunication when ordering the parts. As long as the ball valve is open
during fills I don't think it should matter; technically I should be able to
remove the flow meters and seal those two ports without affecting anything.
Kind regards,
Luke
Luke Fulton, PhD
CHEM BLDG R003
NMR Core Facility Director
Unit 3060
COR2E & Department of Chemistry
55 N Eagleville Road
University of Connecticut
Storrs, CT 06279
email: fko24003_at_uconn.edu
(alias): luke.fulton_at_uconn.edu
mobile: (603) 953-5275
Office: (860) 486-4069
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Received on Sun Apr 20 2025 - 06:23:07 MST