[3dem] issues with liquid nitrogen tanks

[duncan.sousa at rcn.com]

Hi Kristin, 


In my experience owning your own tanks is vastly superior to the half destroyed trash companies like to deliver. I've never had ongoing problems w/ tanks we own (same for the local cryo facilities who own numerous tanks). I like the c-stic for level measurement too (http://cryopurecorp.com/cryogenic-equipment/c-stic-cryo-level-gauge.html). 



Like Craig, I've also been very interested in a quiet relief valve and would love to know if anyone has used a Whisper or something else. 



Kind Regards, 

Duncan 

----- Original Message -----

From: "Kristin Parent" <kparent at msu.edu> 
To: "3dem" <3dem at ncmir.ucsd.edu> 
Sent: Tuesday, January 28, 2020 2:45:15 PM 
Subject: [3dem] issues with liquid nitrogen tanks 



Hello fellow 3dem-ers, 

We are experiencing quite an annoying situation with Airgas and I am wondering if other folks have had similar problems and what potential solutions are. 

We have a custom manifold from Chart to deliver liquid nitrogen to our Talos Arctica that can be equipped with two 240L tanks, each with 22 psi pressure. This should help reduce the LN2 waste and be more efficient, and when our tanks are good, it really is amazing. BUT, some of the time Airgas gives us tanks that we cannot use as the pressure never builds beyond 10 psi and we have to return full tanks. They are not the nicest about this either ☹ 

We know the manifold is working correctly, and that it is caused by individual bad tanks. Has anyone else had crappy tanks? Do people just buy their own tanks and have them refilled instead of swapped? 

Unfortunately, in Michigan Airgas is our only option, so any help would be appreciated. 

Thanks in advance, 
Kristin 

-- 

Kristin N. Parent, PhD 
JK Billman, Jr., MD Endowed Research Professor 
Director, MSU Cryo-EM 
Associate Professor of Biochemistry and Microbiology 
Michigan State University 
603 Wilson Rd 
East Lansing, MI 48824 
Phone: 517-432-8434 
https://kparentlab.natsci.msu.edu/ 
Twitter: @Phage4Lyfe 

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