140 gallon reverse flow insulated firebox build.

adam a · Apr 28, 2016

Hi all,

I have got my hands on a 140 gallon air receiver tank that I plan to turn into a reverse flow off set. I've used Dave's calculator that was converted to excel so would someone be kind enough to check the results for me. They look pretty good but a second opinion will allow me to cut up the cylinder with some confidence that I'm doing the right thing.

I also plan to insulate the firebox with some 1200 degree kiln insulation I have and use a glass door off a combustion heater so I can see what's going on with the fire. Thanks in advance.

Adam.

adam a · Apr 28, 2016

140 Gallon Smoker Calculations.JPG

adam a
Apr 28, 2016

adam a · Apr 28, 2016

20160407_145252.jpg

adam a
Apr 28, 2016

gary s · Apr 30, 2016

They are correct, I see you are using Dave's calculations.

Be a fun build to watch

Gary

adam a · Apr 30, 2016

gary s said:
They are correct, I see you are using Dave's calculations.

Be a fun build to watch

Gary

Someone was kind enough to convert it to Excel which made it very easy to use.

gary s · Apr 30, 2016

Love Excel ------------

Gary

adam a · Apr 30, 2016

gary s said:
Love Excel ------------

Gary

So do I. :) Thanks for checking the maths.

My next step is to clean up the corrosion, cut off the motor mounts and get a coat of primer on it. I'm going to measure out the door and cut it and the fire box openings out. I'm also going to put a concealed door seal on the CC opening so that's going to take a bit of work to do the curved sections but it will be worth it. I got the idea for the combustion stove door after thinking of a way to use the vents out of one so I didn't have to make them and it made sense because of the integrated seal built into the door.

Adam.

bdskelly · Apr 30, 2016

Looks like a GREAT start. Glass door... Fancy! I usually just leave my door open.

Watching this build closely. Point!

Brian

daveomak · Apr 30, 2016

Afternoon Adam...... For the door seals, it's perfectly OK to use thin metal... 1/16" X 1 1/4" works well... or what ever is handy...

adam a · May 1, 2016

I'm going to fold up the straight sides and weld up the curved sides from 3 pieces. It will be a little fiddly but will work well. I'm planning a covered area so I hope this lasts a long time.

I'm in the process of finding an old combustion heater that I can cut up so I'm building the CC first and I have access to a laser cutter so I'm making the hinges, counter weight and handles out of 2 pieces. One per side and weld them to the door. I'll take a picture of the mock up when i make it out of ply.

Adam.

adam a · May 2, 2016

Would putting the fire box door on the front cause any issues. I'm thinking of putting the doors on the front and the vents on the side to keep the airflow clean bu

t make it easier to load wood and see the fire through the glass door.

Adam.

martyinco · May 2, 2016

I cant wait to see the build come together

Even more excited that someone is using the Excel spreadsheet I made

adam a · May 2, 2016

martyinco said:
I cant wait to see the build come together

Even more excited that someone is using the Excel spreadsheet I made

Thanks for making it super easy. :)

adam a · May 10, 2016

I've decided to build the fire box 24" x 22" x 21" to give me a slightly bigger fire box which will allow me to put the double cast iron combustion stove doors I scored on the front and to allow for the 1 inch of insulation so the FB isn't wider than the CC.

20160502_150742.jpg

adam a
May 10, 2016

I've also done the calculation for the RF area so I can start cutting .

RF area.JPG

adam a
May 10, 2016

daveomak · May 17, 2016

Why did you use the 2 knowns above....

How did you know what the segment height was supposed to be ??

These are the variables I used to get the correct segment height.....

Click on the 2 variables you know

......Radius and Central Angle...........................Radius & Chord AB
[X] Radius & Segment Height ED.....................Radius & Apothem OE
......................................................Radius & Arc AB
......Chord AB & Segment Height ED................Chord AB & Apothem OE
......Segment Height ED & Apothem OE...........Chord AB & Arc AB

http://www.smokingmeatforums.com/a/reverse-flow-smoker-how-to-calculate-build-tutorial

5f7.jpg

daveomak
May 17, 2016

..

5f7aa7c3_Partsofacircle.jpg

daveomak
May 17, 2016

adam a · May 17, 2016

I started at 6 and 6 and then adjusted from there. Only took a couple of adjustments to get the right area.

Edward@SouthAfrica · Apr 8, 2019

adam a said:
Someone was kind enough to convert it to Excel which made it very easy to use.

Where can I download the excel calculator?

140 gallon reverse flow insulated firebox build.

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