Hi everyone,
We have a unique installation happening here at the University of Alberta. There is a 500MHz AR (Annual Refill) going into the Prion and Protein Folding Diseases Centre on campus and the magnet will be contained in an enhanced bio-containment level two facility. Anything that goes into the room cannot come out unless thoroughly decontaminated. It would be impractical to do this type of contamination on cryogen dewars on a regular basis so the dewars will be staged on the floor above and the cryogens will flow through transfer lines permanently sealed into the floor.
This introduces some issues;
1) Both transfer lines must be lengthened. I've already received a quote from Agilent for longer lines.
2) The evacuation port for the He transfer line is on the magnet side of the line and therefore inaccessible for future evacuation of the vacuum jacket. I've gone back to Agilent to see if this can be moved to the dewar side of the line.
3) What are the challenges, if any, of filling from the top down? Will the helium and nitrogen behave differently? Will a siphon be created not allowing me to control the flow? Is it dangerous?
I look forward to hearing your thoughts,
Deryck
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Deryck Webb - Business and Technical Manager
NANUC - Canada's National High Field NMR Centre
Room 103 Email: deryck_at_nanuc.ca
NANUC Bldg. Phone: (780) 492-8530
University of Alberta Fax: (780) 492-9174
Edmonton, Alberta Cell: (780) 707-0857
Canada T6G 2E1 AIM: derycknmr
http://www.nanuc.ca
Received on Tue Feb 08 2011 - 14:47:51 MST