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stamandster · 01-13-2012, 09:19 PM

Quote:

Originally Posted by rosienej

I have used McMaster Carr (www.mcmaster.com) I posted the parts earlier in this thread.

Joel

Oh I thought you were buying the heat tape directly from the heat tape site, not mcmaster. Looking good btw!

rosienej · 01-13-2012, 09:54 PM

Quote:

Originally Posted by Huaco

(2) questions.
- Does the heat tape come with it's own tie offs?
- Does all 8 feet of the tape really wrap just 18" of pipe?

Yes and Yes. The tape has the tie offs attached, and As shown, the tape, closely packed covers the 18" of pipe.

rosienej · 01-13-2012, 09:56 PM

Quote:

Originally Posted by stamandster

Oh I thought you were buying the heat tape directly from the heat tape site, not mcmaster. Looking good btw!

The heat tape site has the tape specs. Sorry for the confusion. Thanks for your interest.

Joel

rosienej · 01-14-2012, 08:13 PM

Here is the new unit attached to a second heater I have been using for a couple of years.

rosienej · 01-14-2012, 08:16 PM

The following is an older picture of the heater installed in the RIMs which I have been using for a few years. This rebuild is to refine the system.

**Bitty** · 01-14-2012, 10:47 PM

Thanks for breaking this out of the other thread. Loving the extra pictures, that helps a lot.

rosienej · 01-15-2012, 12:01 AM

Quote:

Originally Posted by Bitty

Thanks for breaking this out of the other thread. Loving the extra pictures, that helps a lot.

Your welcome. Let me know if you have questions or need more photos.

Things to finish up.
1) Add the thermal fuses
2) Build an enclosure
3) Rewire the SSR (Solid State Relay) and PID closer to the enclosure.

rosienej · 01-15-2012, 03:12 PM

I am using the following thermal cut-off by the heaters, since I am going to enclose the two tubes in a box.

(I am using Mouser.com as the supplier)

Per Heating tube.

364 Degree F Thermal Cutoff, 526-NTE8181. Install this on the hot leg of the heater.

High temp Heat shring tubing, 4.75mm dia. 650-CJ6775-00

I will post pictures as these come in and I build.

-Joel

DESIGN GOALS

I want to keep the temperature external to the insulation well below the ignition temperature of wood
(See http://www.fpl.fs.fed.us/documnts/fplmisc/rpt1464.pdf
and http://www.swst.org/teach/teach2/properties2.pdf )

I selected 364 Degrees F on the outside of the insulation by the pipe as a not to exceed temperature, and it would be a temperature
which would suggest a problem with the system (no flow etc). 364 Degrees F should never occur in normal operation, so I will not be swapping
thermal fuses every brew cycle.

You could select a more conservative thermal rating, 250 degrees F if you are not enclosing the heaters, or if want a greater safety margin.