Dear isogeochemists,

I have a 400 liter liquid nitrogen tank conntected to a Finnigan Carbo
Kiel carbonate preparation line. I am observing for the last few years
that my LN2 consumption is increasing over the years. I am wondering
whether the isolation of the tank is decreasing. The tank is
vacuum-isolated and the question is whether I have to re-evacuate the
outermost layer of the tank. The tank is 8 years old.

Does anybody have any experience concerning this  problem? Any advice is
highly welcome.

Cheers

Michael

*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Dr. Michael M. Joachimski
Institut fuer Geologie und Mineralogie
Universitaet Erlangen
Schlossgarten 5
91054 Erlangen
Germany

Voice: +49-9131-8522699 (office)
Voice: +49-9131-8529297 (lab)
Fax:   +49-9131-8529295
[log in to unmask]

http://www.geol.uni-erlangen.de/html/staff/joachims.html
http://www.geol.uni-erlangen.de/html/Masspec/masspec.html
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*