[3dem] Help about ice condensation on LN2 tank mounted to Titan Krios

[Mykhailo Kopylov]

Dear Aguang,

At our facility we never let the tanks to go completely empty, so we have avoided this issue. We usually keep the 230L tank attached to the scope for one week and then replace it with the full one. We use the remaining nitrogen for the daily needs (clipping, loading, freezing etc). This means we always have 2 LN tanks per scope at the facility.

We also monitor the amount of nitrogen in the tank using the industrial scale. LN tank sits on top of the scale when it’s attached to the scope. In this way we know exactly how much LN we have left.

Hope this helps.

Sincerely,
Misha

 --
Mykhailo (Misha) Kopylov, Ph.D.
Scientist, Simons Electron Microscopy Center
New York Structural Biology Center
89 Convent Ave, New York, NY 10027
semc.nysbc.org<http://semc.nysbc.org/>
(212) 939-0660
mkopylov at nysbc.org<mailto:mkopylov at nysbc.org>


From: 3dem <3dem-bounces at ncmir.ucsd.edu> on behalf of Daniel Dai <dawaylong at hotmail.com>
Date: Friday, March 2, 2018 at 10:20 AM
To: "3dem at ncmir.ucsd.edu" <3dem at ncmir.ucsd.edu>
Subject: [3dem] Help about ice condensation on LN2 tank mounted to Titan Krios


Hello 3DEMers



We put a 230L lN2 tank in Krios room to cool Autoloader and scope.

The valves of gas/liquid are always open to make sure auto-refilling work.

Unfortunately, because the temperate of the valves area is much colder than the room temperature, the water molecule in the room condenses onto the valve area, a dense ice growing on top.

This ice melts into water and flows to the ground when the tank is close to emptiness, which bugs me a lot since there are nearby pipes/pumps.

It's almost impossible to remove the tank immediately every time when the tank is almost empty, since the gauge is not that accurate to know the liquid level.

I'm wondering how your facility deal with this issue.

Any suggestion would be greatly appreciated.

Thanks.



Best regards,

Aguang at UT Austin


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