Re: [AMMRL] helium recovery from transfer line

From: Alex Paterson via groups.io <alpaterson=wisc.edu_at_groups.io>
Date: Thu, 19 Jun 2025 13:04:45 +0000

Hi Anne,

Please find attached an image of what we use at NMRFAM to do the line cool-down
recovery. Unfortunately, compared to the excellent BYU writeup that Sameer
shared (TY Sameer!) we are very light on the details.

We find this effective for all of our transfer lines, including our two-piece
pumped magnet transfer lines. We also use it to capture the pressure release
of our dewars at the end of a helium fill.

We estimate that using this tool gains us approximately 2-3% in recovery
effectiveness, particularly if we have a line that's starting to go soft.
Nothing astounding, but definitely worth the investment with our system.
Note that our tool is challenging for one person to manage. The BYU design
looks much more practical if you have only one person working both sides
of the transfer.

As for David's point about purity: we haven't noticed any changes in our
input gas purity from the use of this tool. It's an important thing to
consider, however, particularly if you have only one purifier. I completely
agree with David that it can be worth venting a little helium to manage
overall system costs and uptime. Saving the line cooldown gas won't be
worth it if you end up in a situation where you frequently need to vent
gas due to purifier maintenance.

Best of luck,
Alex

Alex Paterson
The National Magnetic Resonance Facility at Madison (NMRFAM)
University of Wisconsin-Madison
alpaterson_at_wisc.edu




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Received on Thu Jun 19 2025 - 06:14:12 MST