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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#993366">Matthieu –<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#993366">While I am in complete agreement with most of Craig’s points, the main issue in too small a radius bend in your tubing is cleanliness rather than purity (particle
count rather than “how many 9s”). If you are using a corrosive gas, purity can be affected but even more serious is the possibility of moisture entrainment that can cause catastrophic failure.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#993366">As all the responses have said, use a large-radius tube bender and you’ll be fine.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#993366">John<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#993366"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#993366"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt;font-family:"Cambria","serif";color:#993366">John R. Weaver<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt;font-family:"Cambria","serif";color:#993366">Strategic Facilities Officer<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt;font-family:"Cambria","serif";color:#993366">Birck Nanotechnology Center<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt;font-family:"Cambria","serif";color:#993366">1205 West State Street<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt;font-family:"Cambria","serif";color:#993366">West Lafayette IN 47907<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt;font-family:"Cambria","serif";color:#993366">(765) 494-5494<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt;font-family:"Cambria","serif";color:#993366"><a href="mailto:jrweaver@purdue.edu"><span style="color:blue">jrweaver@purdue.edu</span></a><o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:9.0pt;font-family:"Cambria","serif";color:#993366">nano.purdue.edu<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#993366"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#993366"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> labnetwork-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>Craig Cheney<br>
<b>Sent:</b> Wednesday, December 17, 2014 10:21 AM<br>
<b>To:</b> 'Matthieu Nannini, Dr.'; labnetwork@mtl.mit.edu<br>
<b>Subject:</b> Re: [labnetwork] Bending coaxial<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Matthieu,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> We specialize in these types of systems and build them on a regular basis. When bending tubing the first question you have to ask
is, what is the purity and/or reactivity of the gas that you going to be running through the gas lines, and what is the quality of the tubing (carrier tubing) that is going to be bent. If you are going to be using electro-polished tubing for the carrier tubing
which I assume you are, given the two gases listed. Then you have to take into consideration what happens when you bend electro-polished tubing. Even with a low radius tube bender you will create defects in the electro-polish that can lead to problems down
the road. It has been shown that even with a low radius tubing bender that you will induce micro defects into the plating on the interior of tubing that can create nucleation points that can lead to bigger problems down the road such as, particles, corrosion,
and gas contamination. <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> If you are starting out with a gas that is not very pure (99.9%) then you can probably live with some of the problems that will
develop over time. But given the nature of the two gases listed you have to take into consideration the reactivity of those two gases. Given the nature of the two gases being highly corrosive that will cause the gas line to deteriorate over time, and cause
bigger problems. We would highly suggest that you use high quality electro-polished tubing as well as high quality pre-manufactured electro-polished coaxial weld fittings with welded sleeves (which is code in the U.S. for those two gases) and not mechanical
sleeves. <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> I hope that helps and let me know if you have any further questions.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><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" style="margin-left:.5in"><b><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:navy">Craig Cheney<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy"><img border="0" width="239" height="79" id="Picture_x0020_1" src="cid:image001.jpg@01D019F8.CCA1BD40" alt="Description: cid:image001.jpg@01C7E19F.47FFBAE0"></span><span style="color:navy"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:navy">Desk: (608)834-4200<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:navy">Fax: (608)834-4299<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:navy">Cell: (608)438-8714<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:navy"><o:p> </o:p></span></b></p>
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<p class="MsoNormal" style="margin-left:.5in"><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" style="margin-left:.5in"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:labnetwork-bounces@mtl.mit.edu">labnetwork-bounces@mtl.mit.edu</a> [<a href="mailto:labnetwork-bounces@mtl.mit.edu">mailto:labnetwork-bounces@mtl.mit.edu</a>]
<b>On Behalf Of </b>Matthieu Nannini, Dr.<br>
<b>Sent:</b> Tuesday, December 16, 2014 10:33 PM<br>
<b>To:</b> <a href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a><br>
<b>Subject:</b> [labnetwork] Bending coaxial<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">Dear colleagues, <o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">A local company is proposing to bend coaxial SS tubing to install a double containment gas line thus removing the need for welded 90° elbows. did you ever see that ? Any comment would be helpful ! <o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">Thanks<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">Matthieu Nannini<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">Début du message réexpédié :<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-family:"Helvetica","sans-serif"">De:
</span></b><span style="font-family:"Helvetica","sans-serif"">"Matthieu Nannini, Dr." <<a href="mailto:matthieu.nannini@mcgill.ca">matthieu.nannini@mcgill.ca</a>></span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-family:"Helvetica","sans-serif"">Objet: Bending coaxial</span></b><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-family:"Helvetica","sans-serif"">Date:
</span></b><span style="font-family:"Helvetica","sans-serif"">15 décembre 2014 15:31:10 UTC−5</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-family:"Helvetica","sans-serif"">À:
</span></b><span style="font-family:"Helvetica","sans-serif"">Tom Britton <<a href="mailto:tbritton@criticalsystemsinc.com">tbritton@criticalsystemsinc.com</a>></span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in">
Hi tom,<br>
<br>
A local company here can bend coaxial tubing. They quoted me 4800$ for the 2 lines BCl3 and SiCl4.<br>
<br>
What do you think of bending ? They told me the 1/4 wasn’t kinked at all.<br>
<br>
Matthieu<o:p></o:p></p>
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