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<p class="MsoNormal">Martin….,<o:p></o:p></p>
<p class="MsoNormal"> Don’t do it!!!! The best way to keep gases like BCL3 from liquifying is to run them at sub-atmospheric pressures (05”HG). I have been doing this for decades with excellent results.<o:p></o:p></p>
<p class="MsoNormal">It is simple physics; The lower the pressure, the lower the boiling point. You can achieve this with your current gas regulator but a sub atmospheric regulator is smoother and more precise. I am assuming that you are running this gas into
a vacuum system, if so, the pressure delta will allow it to flow to a certain level. If you cannot achieve your maximum flow, increase the pressure slightly.<o:p></o:p></p>
<p class="MsoNormal">Please contact me directly with any questions.<o:p></o:p></p>
<p class="MsoNormal"> Steve (Equipment Dood)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:14.0pt">Steve Paolini<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Principal Equipment Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Harvard University Center for Nanoscale Systems<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">11 Oxford St.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Cambridge, MA 02138<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">617- 496- 9816<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">spaolini@cns.fas.harvard.edu<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">www.cns.fas.harvard.edu</span><span style="font-size:14.0pt"><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"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> <b>
On Behalf Of </b>Martin, Michael<br>
<b>Sent:</b> Thursday, November 17, 2022 10:32 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Heat tape recommendation?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Hello,
<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"> We are about to re-wrap our BCl3 line with heat tape and insulation and are in need of some advice. In the past we have used the rather expensive silicone constant
wattage heaters with adjustable power control <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.mcmaster.com_heat-2Dtape_constant-2Dwattage-2Dheaters-2Dwith-2Dadjustable-2Dtemperature-2Dcontrol-2Dfor-2Dpipes-2Dand-2Dtubes_&d=DwMFAw&c=WO-RGvefibhHBZq3fL85hQ&r=-H4Z_jeDfTYjnKPXor15vLwzBllmg8gFrb9m_k9OGks&m=brdRaC3ro_xDwOpS5O-x16I3PMSl21G6TIawpW_Arwis_HHzlqHR-ZP_oaCl__DL&s=IuNsIc0AX2kGzXyrmjoq2CjRSlkdUJq0BL08FWwL91Q&e=">
https://www.mcmaster.com/heat-tape/constant-wattage-heaters-with-adjustable-temperature-control-for-pipes-and-tubes/</a> . The problem we have is that these do not seem to last very long before burning out, and as I mentioned are quite expensive. Does anyone
have a better solution? Longer lasting and cheaper? I should mention that we need only to keep the tubing at maybe 30C to prevent condensation of the BCl3 vapor.
<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"> I was looking at self-regulating heat tapes used to prevent pipes from freezing (an interesting technology in its own right) but am not sure they operate above room
temperature given their intended application. <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.thecarycompany.com_temperature-2Dcontrol_heating-2Dcables_self-2Dregulating-2Dcables-3Ftemp-5Fvoltage-3D157510&d=DwMFAw&c=WO-RGvefibhHBZq3fL85hQ&r=-H4Z_jeDfTYjnKPXor15vLwzBllmg8gFrb9m_k9OGks&m=brdRaC3ro_xDwOpS5O-x16I3PMSl21G6TIawpW_Arwis_HHzlqHR-ZP_oaCl__DL&s=IIHCxI8mPQV9c4Rc8pPmpjqNDeZa92b53Ne1WqbSyDI&e=">
https://www.thecarycompany.com/temperature-control/heating-cables/self-regulating-cables?temp_voltage=157510</a> The nice thing about these is that they evidently last for years.
<o:p></o:p></span></p>
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<p class="MsoNormal"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.thecarycompany.com_temperature-2Dcontrol_heating-2Dcables_self-2Dregulating-2Dcables-3Ftemp-5Fvoltage-3D157510&d=DwMFAw&c=WO-RGvefibhHBZq3fL85hQ&r=-H4Z_jeDfTYjnKPXor15vLwzBllmg8gFrb9m_k9OGks&m=brdRaC3ro_xDwOpS5O-x16I3PMSl21G6TIawpW_Arwis_HHzlqHR-ZP_oaCl__DL&s=IIHCxI8mPQV9c4Rc8pPmpjqNDeZa92b53Ne1WqbSyDI&e=" target="_blank"><span style="text-decoration:none"><img border="0" width="160" height="160" style="width:1.6666in;height:1.6666in" id="_x0000_i1025" src="https://www.thecarycompany.com/media/logo/default/the-cary-company-logo.png"></span></a><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Segoe UI Light",sans-serif"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__www.thecarycompany.com_temperature-2Dcontrol_heating-2Dcables_self-2Dregulating-2Dcables-3Ftemp-5Fvoltage-3D157510&d=DwMFAw&c=WO-RGvefibhHBZq3fL85hQ&r=-H4Z_jeDfTYjnKPXor15vLwzBllmg8gFrb9m_k9OGks&m=brdRaC3ro_xDwOpS5O-x16I3PMSl21G6TIawpW_Arwis_HHzlqHR-ZP_oaCl__DL&s=IIHCxI8mPQV9c4Rc8pPmpjqNDeZa92b53Ne1WqbSyDI&e=" target="_blank"><span style="text-decoration:none">Self-Regulating
Heating Cables</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:wf_segoe-ui_normal;color:#666666">Automatically Adjust Your Heat Output With Self-Regulating Cables! Keep your pipes from freezing with our Self-Regulating Heating Cables. The cables automatically
adjust heat output based on the surface temperature and can also be great for low-temperature process maintenance. The flexibility of the cables can help you get even the most hard to heat applications. Options thermoplastic and fluropolymer jackets as well
as tinned copper braid outside finishes. Whether you need low, medium, or high temperature cables, shop and compare all of our selection to find the best fit for you!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:wf_segoe-ui_normal;color:#A6A6A6"><a href="http://www.thecarycompany.com">www.thecarycompany.com</a><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Also, do you have any recommendations for insulating tubing in a cleanroom environment?
<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black">Regards,
<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;color:black"> Michael
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p><span style="font-size:12.0pt;color:black">Senior Process Engineer <o:p></o:p></span></p>
<p><span style="font-size:12.0pt;color:black">Micro/Nano Technology Center<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;color:black">University of Louisville<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">(502) 552-1945</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p><span style="font-size:12.0pt;color:black">Web page:<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__louisville.edu_micronanohttps-3A__www.instagram.com_micronanolouisville_&d=DwMFAw&c=WO-RGvefibhHBZq3fL85hQ&r=-H4Z_jeDfTYjnKPXor15vLwzBllmg8gFrb9m_k9OGks&m=brdRaC3ro_xDwOpS5O-x16I3PMSl21G6TIawpW_Arwis_HHzlqHR-ZP_oaCl__DL&s=MPyh2lAiH1Q5vHSh-s1mVDEMaQuWRvlkli0W63U8Fww&e=">
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