Hello,
Last time with your help I've figured out that plastic tube I was
using to pump boil-off nitrogen to the VT system
is actually permeable to water. I've switched to polyethylene, it's
kind of better,
but we still get freeze-outs (we have chiller with coldest part at
-40C) after 4 days.
Copper tube will sure work better, but I'd like to find out that kind
of plastic is usable.
If you are using plastic tube for VT gas - could you take a look at
tell what manufacturer, type and wall thickness it is?
Also please include what is the lowest temperature along the line and
how many days of continuous VT operation do you get.
Turns out that plastic is used in the membrane dryers and gas
separators, where tiny holes allow some molecules
leak out faster. So I'm curious what plastics have the lowest gas permeability.
Thanks!
--
Evgeny Fadeev, Ph.D.
Director, BioMolecular Spectroscopy Facility
1212 Natural Sciences 1
University of California Irvine
Irvine, CA 92697
telephone: 949-824-5842
www.physics.uci.edu/~biomolenmr
nmrwiki.org
Received on Tue Dec 02 2008 - 14:16:13 MST