Thanks to all for the great advice. Fortunately, facilities came through and
got the elevator fixed this morning.
Most in the group felt that running the tubing from the dock through the window
was the best idea. I think I'll measure that distance and get some tubing
and insulation, just in case.
Several said the the transfer dewar could be used, but only if using N2 from
a cylinder to push the liquid through a transfer tube. The "beer bong" approach
was panned for reasons of both safety and concern for getting water in the
magnet.
One member pointed out that dewars in the elevator could be a big safety risk,
if one vented. We'll immediately make it policy that dewars ride alone.
Thanks again!
Janet Asper
Sent from my iPhone
On Jul 8, 2011, at 2:43 PM, "Janet Asper (jasper)" <jasper_at_umw.edu> wrote:
> I've got another interesting challenge with our Bruker Avance 300.
> We need to do a liquid N2 fill, but our building elevator is out of order,
so our dewar is not able to be brought up to the NMR. We need to come up one
floor. I've let facilities know of the urgency of the situation, but it may
not be repaired this week. We're pretty low, and I'm really afraid to let
it go until Monday.
> So far we've got two ideas for filling the magnet.
> 1. Leave the dewar in our loading dock and run tubing from the dock through
the window to the NMR (which is immediately above the dock). The amount of
N2 we'll lose in the warm temps is concerning.
> 2. Use the small dewar that is with our system for low temp experiments
and use that to shuttle N2 up the stairs and pour it into the magnet using
a large funnel attached to the rubber tubing that we usually attach the dewar to.
> Any other ideas?
>
>
>
> Janet A. Asper
> Assistant Professor, Chemistry
> University of Mary Washington
> 1301 College Avenue
> Fredericksburg, VA 22401
> 540-654-1143: 540-654-1081 fax
> jasper_at_umw.edu
>
>
>
Received on Fri Jul 08 2011 - 12:20:50 MST