Hi Greg,
Thanks for the wealth of information on this thread (and I'm very curious
about your purity monitoring setup as I've been thinking about this recently
as well). We have a similar sized helium recovery system installed
(7 magnets, storage/bags in separate room, 2" copper piping and mostly
connected via ProPress fittings) and we've been dealing with some impurity
problems over the past year. We have a CryoMech recovery system
and we noticed that our automatic purifier regenerated on a daily basis since
install. For almost a year, we thought this was normal operation and
that the impurity capacity in the traps must be small. While
dealing with a lot of other purifier problems in the first year of operation,
we were told by CryoMech that the bags are semi-permeable and they allow a
small amount of air and water to pass through and this was the source of our
impurities (we were confused how it would hold helium while allowing these
impurities to pass). After chatting with other facility managers
with the same equipment, we realized that these purifiers should normally
regenerate once a week or so. This led us down a path of trying
to find sources of impurities within our system. We ended up
isolating magnets to collect helium from different branches of system and
performed RGA analysis on the gases. In our case, the problem
ended up being our old pumped Varian 800MHz system. Once we
isolated it, our purifier run time has now increased to about 1week+
(collecting boiloff helium from all magnets, and pumped helium from our
Bruker 850).
Here's a tl;dr version of what we learned:
1) We have two large bags (approximately 800cf total), and they do NOT introduce
much impurity into the system.
2) Boiloff gas and fill/flash gas are quite pure.
3) For a system consisting of a few magnets, the purifier should run for over a
week without regeneration if the amount of impurities is small.
4) If you are dealing with a large amount of impurities, vacuum pumps on pumped
magnets may be the problem!
Best,
Samrat Amin
Magnetic Resonance Research Center
Arizona State University
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#1308): https://urldefense.com/v3/__https://ammrl.groups=
.io/g/main/message/1308__;!!PvDODwlR4mBZyAb0!UcAaW-SxO-rbBWJyG1neg0_HPFDoFd=
i_J6wZJYiv_EvyI0HrACszh--tBPqg9jz8nWNIiotubd9N_-HwjbwKdQ$
Mute This Topic: https://urldefense.com/v3/__https://groups.io/mt/106356934=
/7559972__;!!PvDODwlR4mBZyAb0!UcAaW-SxO-rbBWJyG1neg0_HPFDoFdi_J6wZJYiv_EvyI=
0HrACszh--tBPqg9jz8nWNIiotubd9N_-G6ev7WXg$
Mute #heliumrecovery:
https://urldefense.com/v3/__https://ammrl.groups.io/g/=
main/mutehashtag/heliumrecovery__;!!PvDODwlR4mBZyAb0!UcAaW-SxO-rbBWJyG1neg0=
_HPFDoFdi_J6wZJYiv_EvyI0HrACszh--tBPqg9jz8nWNIiotubd9N_-GUPGIU_w$
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
Received on Thu May 30 2024 - 14:33:02 MST