I did a fill a few years ago where the Helium was somewhere below 15% ( we did not want to risk boiling off more helium checking the level meter). I suggest using a spreader attachment on the magnet end of the transfer tube to reduce the risk of the incoming gas/liquid of disturbing the little remaining helium onto of the magnet coil and exposing it, do not do the fill alone and have a clear path to the exit ready.
On Nov 15, 2016, at 01:30 PM, "Zhang, Tracy Chunxin (GE Global Research, US)" <zhangc_at_ge.com> wrote:
Dear all,
We are in a situation that we need to fill a magnet with only 6% He left. I wonder if someone has dealt with a similar situation and have some advice to share. Thank you!
Tracy Zhang, PhD
Analytical Chemist
GE Global Research
T +1 518 387 7642
F +1 518 387 6945
tracy.zhang_at_ge.com
www.ge.com
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Niskayuna, NY 12309
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Received on Tue Nov 15 2016 - 08:58:46 MST