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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Kyle,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We run UHP (>99.9995%) electropolished 316 from our (“VLSI” – SEMI Standard) bulk tanks, so don’t have POU purifiers. But I would be thinking about grab samples w/ analytical testing, not changing as preventive
maintenance activity.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We used </span><a href="https://astg.com/"><span style="font-size:11.0pt">https://astg.com/</span></a><span style="font-size:11.0pt"> for onsite 3<sup>rd</sup> party QA/QC of our bulk tanks in the past and
they offer cylinder rentals for remote mass spec testing. It was reasonably prices.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I would also grab the “dirty” side to compare…If your source is boil off and distributed in clean copper, you might be pleasantly surprised at the quality upstream. Depending on the contaminant of concern
(e.g. typically H2O, O2, Hydrocarbons and particles), some are inexpensive/easy to remove with filters and desiccants. Once you get into the all in one or reactive media, the cost gets very high.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I have found that components (filters, meters, regulators etc) tend to run far longer than I assumed under inert UHP conditions…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Nicholas Menounos, </span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">PE, LEED AP</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Associate Director of Infrastructure</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#212121"> </span></b><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#212121">MIT.nano</span></b><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Massachusetts Institute of Technology</span></b><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">77 Massachusetts Ave, Bldg 12-5007</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Cambridge, MA 02139</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Cell: </span><span style="color:black"><a href="tel:+15089320938"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:blue">(508)
932-0938</span></a></span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Office: </span><span style="color:black"><a href="tel:+16172537234"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:blue">(617)
253-7234</span></a></span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Email: </span><a href="mailto:Menounos@mit.edu"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:blue">Menounos@mit.edu</span></a><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> labnetwork <labnetwork-bounces@mtl.mit.edu>
<b>On Behalf Of </b>Kyle Keenan<br>
<b>Sent:</b> Wednesday, February 12, 2025 4:10 PM<br>
<b>To:</b> Lab Network (labnetwork@mtl.mit.edu) <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> [labnetwork] longevity of N2 purifiers<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello All,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Our cleanroom has been in operation for 11 years and, for high purity N2, we use local purifiers. Given their age, I'm starting to wonder if/when they might need to be replaced. I've looked into it, and doing so would be quite costly. I
know there are a ton of variables at play, but generally speaking, for an 11,000 sq/ft facility that uses UPN2 on, perhaps, 15-20 pieces of research equipment and for N2 guns at ~15 wet benches, what would be your expectation? Is this something we even need
to worry about? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'd be interested to read your thoughts.<br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal"><span class="gmailsignatureprefix">-- </span><o:p></o:p></p>
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<p class="MsoNormal">Kyle Keenan<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Senior Manager - Laboratory Operations<o:p></o:p></p>
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<p class="MsoNormal">Quattrone Nanofabrication Facility<o:p></o:p></p>
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<p class="MsoNormal">University of Pennsylvania<o:p></o:p></p>
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<p class="MsoNormal">P: 215-898-7560<o:p></o:p></p>
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<p class="MsoNormal">F: 215-573-4925<o:p></o:p></p>
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