<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000'>Hi,<br><br>I have never had a problem with icing on either the liquid or gas valves leading to the Titan from our 120L dewars (only during filling do you get some frost). The valves are always open to allow autofilling, etc. It sounds like the main problem is you have a slow leak in your LN2 lines either inside the Titan or going to it. <br><br>Kind Regards,<br>Duncan<br><br><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Daniel Dai" <dawaylong@hotmail.com><br><b>To: </b>3dem@ncmir.ucsd.edu<br><b>Sent: </b>Friday, March 2, 2018 10:20:30 AM<br><b>Subject: </b>[3dem] Help about ice condensation on LN2 tank mounted to Titan Krios<br><br>
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<p style="margin-top:0;margin-bottom:0">Hello 3DEMers</p>
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<p style="margin-top:0;margin-bottom:0">We put a 230L lN2 tank in Krios room to cool Autoloader and scope.</p>
<p style="margin-top:0;margin-bottom:0">The valves of gas/liquid are always open to make sure auto-refilling work.</p>
<p style="margin-top:0;margin-bottom:0">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.</p>
<p style="margin-top:0;margin-bottom:0">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.</p>
<p style="margin-top:0;margin-bottom:0">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.<br>
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<p style="margin-top:0;margin-bottom:0">I'm wondering how your facility deal with this issue.</p>
<p style="margin-top:0;margin-bottom:0">Any suggestion would be greatly appreciated.</p>
<p style="margin-top:0;margin-bottom:0">Thanks.</p>
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<p style="margin-top:0;margin-bottom:0">Best regards,</p>
<p style="margin-top:0;margin-bottom:0">Aguang at UT Austin<br>
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