[labnetwork] Heat tape recommendation?

Fri Nov 18 05:15:45 EST 2022

Hi Martin,
I agree with Mr. Paolini.    At Draper, I have the BCL3 as close as possible to the etch tool and do not have the lines heated.  I have the gas flowing the same as Steve mentioned for years without issue
Thanks

Mark R. April
Senior  Equipment Engineer
Microfabrication Laboratory
[color_logo_small4]
555 Technology Square
Cambridge, MA  02139
mapril at draper.com<mailto:mapril at draper.com>
O # 617-258-1613 C # 617-455-1596
www.draper.com<http://www.draper.com/>

From: labnetwork <labnetwork-bounces at mtl.mit.edu> On Behalf Of Paolini, Steven
Sent: Thursday, November 17, 2022 2:19 PM
To: Martin, Michael <michael.martin at louisville.edu>; labnetwork at mtl.mit.edu
Subject: Re: [labnetwork] Heat tape recommendation?

Martin....,
  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.
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.
Please contact me directly with any questions.
  Steve (Equipment Dood)

Steve Paolini
Principal Equipment Engineer
Harvard University Center for Nanoscale Systems
11 Oxford St.
Cambridge, MA 02138
617- 496- 9816
spaolini at cns.fas.harvard.edu<mailto:spaolini at cns.fas.harvard.edu>
www.cns.fas.harvard.edu<http://www.cns.fas.harvard.edu>

From: labnetwork <labnetwork-bounces at mtl.mit.edu<mailto:labnetwork-bounces at mtl.mit.edu>> On Behalf Of Martin, Michael
Sent: Thursday, November 17, 2022 10:32 AM
To: labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>
Subject: [labnetwork] Heat tape recommendation?

Hello,
   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 https://www.mcmaster.com/heat-tape/constant-wattage-heaters-with-adjustable-temperature-control-for-pipes-and-tubes/<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=> .  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.
[https://images1.mcmaster.com/init/gfx/favicon/192x192.png?ver=1622796110]<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=>
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McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
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   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.  https://www.thecarycompany.com/temperature-control/heating-cables/self-regulating-cables?temp_voltage=157510<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=> The nice thing about these is that they evidently last for years.
[https://www.thecarycompany.com/media/logo/default/the-cary-company-logo.png]<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=>
Self-Regulating Heating Cables<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=>
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!
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Also, do you have any recommendations for insulating tubing in a cleanroom environment?

Regards,
   Michael

Senior Process Engineer

Micro/Nano Technology Center

University of Louisville
(502) 552-1945

Web page: https://louisville.edu/micronano<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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