[labnetwork] Heat tape recommendation?

[Martin, Michael]

Ah-ha! Looking at our BCl3 cabinet, we do have a single stage regulator that at least has a gauge capable of negative values.  Think I will just give it a try.  Getting a sub-atmospheric regulator IS something that has been on our to do list for some time.  It would be wonderful if we've already had one.  What pressure are you running?  It looks like the B.P. at 1 ATM is 12.5 C, so even if I run just one PSI above atmosphere, I bet it will work. Unfortunately, I cannot find a full phase diagram for BCl3.

Thanks for the advice everyone!
Regards,
   Michael
________________________________
From: Mac Hathaway <hathaway at cns.fas.harvard.edu>
Sent: Thursday, November 17, 2022 2:28 PM
To: Martin, Michael <michael.martin at louisville.edu>; labnetwork at mtl.mit.edu <labnetwork at mtl.mit.edu>
Subject: Re: [labnetwork] Heat tape recommendation?


CAUTION: 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.

Hi Michael,

I'm sure others will weigh in shortly, but very briefly:

What we do at CNS is to run a sub-atmospheric regulator on BCl3, so that we don't have to run any heating tape on the lines.  As long as the supply lines are not so long that elevated pressure is needed to generate the needed flow rate, running the regulator below atmospheric pressure avoids condensation, without the need for supplemental heat.


Mac



Mac Hathaway

Senior Process and Systems Engineer

Harvard Center for Nanoscale Systems

11 Oxford St.

Cambridge, MA  02138

617-495-9012



On 11/17/2022 10:32 AM, Martin, Michael wrote:
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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__www.mcmaster.com_heat-2Dtape_constant-2Dwattage-2Dheaters-2Dwith-2Dadjustable-2Dtemperature-2Dcontrol-2Dfor-2Dpipes-2Dand-2Dtubes_%26d%3DDwMFAw%26c%3DWO-RGvefibhHBZq3fL85hQ%26r%3DTEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY%26m%3DKWLJCM6ZhWpx1UvrUBWkHKKjEoGzVZrVKbx1lmT96OCO8boDFL9fPSm9_ykSmZuQ%26s%3D7Db1yjuVUcVyMNWVgF_ViFS0RjFPjkEuD6LZ3iMZYVc%26e%3D&data=05%7C01%7Cmichael.martin%40louisville.edu%7C406241e2f4da4997a62508dac8d1eb24%7Cdd246e4a54344e158ae391ad9797b209%7C0%7C0%7C638043101191601650%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=26oFkVvPcPYJGVo4ZzbJV99n3OkJXhCwNnRrqtYkbUE%3D&reserved=0> .  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.
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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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-3A__www.thecarycompany.com_temperature-2Dcontrol_heating-2Dcables_self-2Dregulating-2Dcables-3Ftemp-5Fvoltage-3D157510%26d%3DDwMFAw%26c%3DWO-RGvefibhHBZq3fL85hQ%26r%3DTEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY%26m%3DKWLJCM6ZhWpx1UvrUBWkHKKjEoGzVZrVKbx1lmT96OCO8boDFL9fPSm9_ykSmZuQ%26s%3DuVM7vhB8VwmRD9MaZyQcnbKLOAHitY3R6t7KI8u58jM%26e%3D&data=05%7C01%7Cmichael.martin%40louisville.edu%7C406241e2f4da4997a62508dac8d1eb24%7Cdd246e4a54344e158ae391ad9797b209%7C0%7C0%7C638043101191601650%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=QZdtEA65OiUPPGRIOtkK%2BV9vlZfPmTYQ59CoYyQdInU%3D&reserved=0> The nice thing about these is that they evidently last for years.
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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

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