[labnetwork] Heat tape recommendation?

Thu Nov 17 14:28:29 EST 2022

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, MA02138

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://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=TEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY&m=KWLJCM6ZhWpx1UvrUBWkHKKjEoGzVZrVKbx1lmT96OCO8boDFL9fPSm9_ykSmZuQ&s=7Db1yjuVUcVyMNWVgF_ViFS0RjFPjkEuD6LZ3iMZYVc&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://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=TEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY&m=KWLJCM6ZhWpx1UvrUBWkHKKjEoGzVZrVKbx1lmT96OCO8boDFL9fPSm9_ykSmZuQ&s=7Db1yjuVUcVyMNWVgF_ViFS0RjFPjkEuD6LZ3iMZYVc&e=>
> 	
> McMaster-Carr 
> <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=TEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY&m=KWLJCM6ZhWpx1UvrUBWkHKKjEoGzVZrVKbx1lmT96OCO8boDFL9fPSm9_ykSmZuQ&s=7Db1yjuVUcVyMNWVgF_ViFS0RjFPjkEuD6LZ3iMZYVc&e=>
> 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.
> www.mcmaster.com
>
>    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=TEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY&m=KWLJCM6ZhWpx1UvrUBWkHKKjEoGzVZrVKbx1lmT96OCO8boDFL9fPSm9_ykSmZuQ&s=uVM7vhB8VwmRD9MaZyQcnbKLOAHitY3R6t7KI8u58jM&e=> 
> The nice thing about these is that they evidently last for years.
> <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=TEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY&m=KWLJCM6ZhWpx1UvrUBWkHKKjEoGzVZrVKbx1lmT96OCO8boDFL9fPSm9_ykSmZuQ&s=uVM7vhB8VwmRD9MaZyQcnbKLOAHitY3R6t7KI8u58jM&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=TEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY&m=KWLJCM6ZhWpx1UvrUBWkHKKjEoGzVZrVKbx1lmT96OCO8boDFL9fPSm9_ykSmZuQ&s=uVM7vhB8VwmRD9MaZyQcnbKLOAHitY3R6t7KI8u58jM&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!
> www.thecarycompany.com
>
> 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=TEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY&m=KWLJCM6ZhWpx1UvrUBWkHKKjEoGzVZrVKbx1lmT96OCO8boDFL9fPSm9_ykSmZuQ&s=_n3p85D3NIeqxSOLhSYW847_zTHmH51vRCYVZcw-Lfc&e=>
>
> Instagram: https://www.instagram.com/micronanolouisville/ 
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>
> Facebook https://www.facebook.com/MNTCUOFL/ 
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>
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