Perhaps they may be referring to the braided lines recently supplied by Varian/Agilent which are designed to fit over the nitrogen stack and screw onto the LN2 dewar via the standard threaded coupling?
Not wanting to hijack your post, but I've been wanting to post this observation. I use these Varian supplied SS lines and they perform well enough - when it doesn't leak! I never have problems filling my 400, but when I use the SS line to fill my 700, about 50% of the time it leaks at the magnet stack, causing me to abort the fill less I get a cold spot on the magnet dewar- which can lead to setting off the high helium boil off alarm. I've inspected the O-rings on the magnet side coupling of the transfer line and they're fine, the connection is snug enough. I've tried filling from the other available stack, and swapped the transfer line with the 400, and it still leaks on the 700 (but never once with the 400). Anyone seen this issue?
PS: also, how easy is it to move the digital N2 meter from one stack to another?
Neal
Neal J. Stolowich, Ph.D.
ULNMR Facilities Manager
Department of Chemistry
Office: 502 852 7894/Fax: 502 852 8149
-----Original Message-----
From: Joseph Sachleben [mailto:jsachleben_at_uchicago.edu]
Sent: Tuesday, December 02, 2014 2:40 PM
To: ammrl_at_ammrl.org
Subject: AMMRL: stainless steel l-N2 transfer lines
Hi All,
I remember a few months ago there was a discussion about liquid nitrogen fills. I have always used latex tubing to connect the nitrogen dewar to the magnet. Some of you mentioned that you used stainless steel l-N2 transfer lines to do the fills. The question I have is how do you connect the stainless steel transfer line to the magnet.
Thanks,
Joe
Joseph R. Sachleben, Ph. D.
Technical Director Biomolecular NMR Facility The Division of Biological Sciences
929 E. 57th St.
Chicago, IL 60637
(773)834-9866
jsachleben_at_uchicago.edu
Received on Thu Dec 04 2014 - 03:08:26 MST