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<p>Rich,</p>
<p><br>
</p>
<p>I assume you're talking VBC system? </p>
<p>We have such a system for many years. Other than regular oil changes and pump service, only thing I encounter was a totally flattened viton gasket in a vacuum bellow jumper. It didn't leak, but it really looked like a washer, not as an o-ring. I am thinking
about doing wholesale o-ring change on our system as such o-rings are just waiting to leak.</p>
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<p>Thanks</p>
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<p>Mike</p>
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<div style="margin-top:0; margin-bottom:0">_______________________</div>
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<div style="margin-top:0; margin-bottom:0">Michael Yakimov</div>
<div style="margin-top:0; margin-bottom:0">Research Scientist</div>
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<div style="margin-top:0; margin-bottom:0">State University of NY</div>
<div style="margin-top:0; margin-bottom:0">SUNY Polytechnic Institute</div>
<div style="margin-top:0; margin-bottom:0">251 Fuller rd</div>
<div style="margin-top:0; margin-bottom:0">Albany NY 12203 </div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> labnetwork-bounces@mtl.mit.edu <labnetwork-bounces@mtl.mit.edu> on behalf of Harlan, Richard D <rharlan@purdue.edu><br>
<b>Sent:</b> Tuesday, February 16, 2021 4:30 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Liquid Nitrogen Vacuum Jacketed Line Maintenance Question</font>
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<p class="MsoNormal">Greetings All,</p>
<p class="MsoNormal">Our facility is now 15 years old and starting to require more preventative maintenance. The vacuum jacketed liquid nitrogen line was showing an increased leak rate for a short period of time. It has since stabilized, but has raised questions
about potential leaks in the system. </p>
<p class="MsoNormal">Have any of your facilities experienced this type of problem and what PM’s have you put in place to address the LN2 and vacuum jacketed line integrity?</p>
<p class="MsoNormal">Thank you in advance for the feedback.</p>
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<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">Rich Harlan</p>
<p class="MsoNormal">Research Engineering</p>
<p class="MsoNormal">Birck Nanotechnology Center | Room 2287C</p>
<p class="MsoNormal"><b>Office:</b> <span style="color:#2E74B5">765.494.6697</span> |
<b>Email:</b> <a href="mailto:rharlan@purdue.edu"><span style="color:#0563C1">rharlan@purdue.edu</span></a></p>
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