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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We have the same at the University of Louisville. Coax helps me sleep at night.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Cheers!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Julia Aebersold, Ph.D.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Manager, Micro/Nano Technology Center<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">University of Louisville<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Shumaker Research Building, Room 233<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">2210 South Brook Street<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Louisville, KY 40292<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">(502) 852-1572<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="http://louisville.edu/micronano/"><span style="color:#0563C1">http://louisville.edu/micronano/</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><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-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>Leif Steen Johansen<br>
<b>Sent:</b> Monday, September 14, 2020 4:13 PM<br>
<b>To:</b> Kamal Yadav <kamal.yadav@gmail.com>; labnetwork@mtl.mit.edu<br>
<b>Subject:</b> Re: [labnetwork] Toxic Gases tubing<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="line-height:12.0pt;background:#FF4D4D"><b><span style="font-size:10.0pt;color:black">CAUTION:</span></b><span style="font-size:10.0pt;color:black"> This email originated from outside of our organization. Do not click links, open
attachments, or respond unless you recognize the sender's email address and know the contents are safe.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="DA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hello Kamal,
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Like University of Michigan we also run all toxic and pyrophoric gases in coaxial pipes. The inner pipe is made of electro polished 316L stainless steel with
a surface roughness of 0.25μm. All welding is orbital welding performed by certified welders using certified equipment. We allow our welders to bend the tubes with a dedicated tool. Some sites don’t allow this, since this theoretically could cause a larger
surface roughness in the bends. Such sites buy pre-made bends that are welded onto the straight pipes.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The outer pipe of the coax line is monitored for gas leaks. We have two systems: One system constantly pumps on the outer pipe and monitors the pumped air for
toxics. In the other type of system the outer pipe is pumped to vacuum, sealed off, and then monitored by a vacuum gauge. A coax monitor alarm (sensed gas or loss of vacuum in outer pipe) automatically shuts down the gas line, evacuates the building and calls
the fire brigade. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">All connections are of the VCR type and are placed inside a vented and gas monitored enclosure.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We have all the four gases you mention, and all of them are nasty in their own way, so please take good care of yourself.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best regards,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Leif<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><img border="0" width="36" height="53" id="_x0000_i1025" src="http://www.dtu.dk/-/media/DTU_Generelt/Andet/mail-signature-logo.png" alt="http://www.dtu.dk/-/media/DTU_Generelt/Andet/mail-signature-logo.png"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:120%"><b><span style="font-family:"Arial",sans-serif;color:black">Leif Steen Johansen<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Head of Operations, Ph.D.<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Dir. +45 45 25 57 13<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Mob. +45 25 34 89 92<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black"><a href="mailto:lesjo@dtu.dk"><span style="color:black;text-decoration:none">lesjo@dtu.dk</span></a>
<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Ørsteds Plads, Byg. 347<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">Building 347<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black">2800 Lyngby<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.75pt"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:black"><a href="https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dtu.dk%2Fenglish&data=02%7C01%7Cjulia.aebersold%40louisville.edu%7C45873504b5554e6867f008d85909ab47%7Cdd246e4a54344e158ae391ad9797b209%7C0%7C0%7C637357245364031355&sdata=JZGn%2F4ajaaQkWQsanwSZfG7SANQe9FE3r9XkdOSFX0k%3D&reserved=0"><span style="color:black;text-decoration:none">www.dtu.dk/english</span></a>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<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">
<a href="mailto:labnetwork-bounces@mtl.mit.edu">labnetwork-bounces@mtl.mit.edu</a> <<a href="mailto:labnetwork-bounces@mtl.mit.edu">labnetwork-bounces@mtl.mit.edu</a>>
<b>On Behalf Of </b>Kamal Yadav<br>
<b>Sent:</b> 14. september 2020 18:43<br>
<b>To:</b> <a href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a><br>
<b>Subject:</b> [labnetwork] Toxic Gases tubing<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear 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">We will be installing SS gas tubing for Cl2, BCl3, HBr, SiH4.<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 have some experience in how industry does it, but wanted to know how different universities do this. From some prior posts, I got to know University of Michigan has co-axial tubing for all these gases and every connector location for
these gases is exhausted as well at their facility<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">My queries are: <o:p></o:p></p>
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<p class="MsoNormal">1. Is this how most of the Universities do it or there are places where these gases are in single tubing [non co-axial or double contained]. <o:p></o:p></p>
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<p class="MsoNormal">2. Also if you do orbital welding or just bending of the tubes?<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">I have been informed it is based on the fire code of the city or county, but it's not apparent from those documents.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks for your help.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Kamal <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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