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New guy first time builder 250 gallon reverse flow.

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New guy first time builder 250 gallon reverse flow.

Postby cclark » June 13th, 2012, 10:16 am

Hey guys been looking at the site for a while now. Learned a lot of great things you guys know your stuff. My name is Cody I'm from east Texas area. Me and my grandpa bought a 250 gallon propane tank a couple weeks ago from a propane place and about to try out our hand at this. Grandpa was a pipeline welder so he will be doing most the welding. I will be doing the cutting grinding etc. my tank is 88" in length and 30" in diameter. I googled a firebox calculator and it said I needed 20724 cubic inches. I do not know if all calculators are the same but does this sound right? It comes out to like 27.4" squared. Another question I have is does the baffle plate have to be a certain thickness like 3/16" or can I get away with 1/8"? We plan on starting this weekend and picking up the plate and other supplies Friday. Thanks for the help.
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Re: New guy first time builder 250 gallon reverse flow.

Postby Gizmo » June 13th, 2012, 12:05 pm

Welcome cclark! - Looking forward to seeing your build...
Mass is your best friend when it comes to the baffle plate so most will recommend at least 1/4 inch - the more massive the steel the better it helps stabilize the heat over time...

The calculations are done by smart smokerbuilders - not me - but they'll be along soon ... :)
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Re: New guy first time builder 250 gallon reverse flow.

Postby alleyrat58 » June 13th, 2012, 1:04 pm

Welcome cclark! Can't wait to see your build! Take lots of pics for DCMAN the "photo czar." :rulz:

Frank is the guru when it comes to calculations, but off the hip you sound close. I believe the volume of the stack will be of more importance.

I will echo Rick's comment about the baffle plate - go big or go home - LOL. I just put a baffle plate in my smoker, 1/4 inch, and definitely would not go less than that if I had to do it over.
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Re: New guy first time builder 250 gallon reverse flow.

Postby cclark » June 13th, 2012, 3:12 pm

Ok well in that case I may go with 1/4" firebox as well. I'll be sure to post pics of progress.
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Re: New guy first time builder 250 gallon reverse flow.

Postby Smokeone » June 13th, 2012, 4:14 pm

Welcome cclark!
Calculations are not me either, but I think you are close.
I would go with 1/4 for the baffle and the firebox (if it is not insulated). That is just my .02.
Good luck, and dont be scared of DC he is a creampuff. :P
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Re: New guy first time builder 250 gallon reverse flow.

Postby cclark » June 13th, 2012, 6:08 pm

Thanks guys for the help will be picking up a 1/4"plate tomorrow or friday.
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Re: New guy first time builder 250 gallon reverse flow.

Postby RDRASH » June 13th, 2012, 9:18 pm

Baffle plate should be no thinner than 1/4, firebox should be roughly 1/3 the volume of the cook chamber. Oh take lots of pics or :nopic:
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Re: New guy first time builder 250 gallon reverse flow.

Postby dcman (The Czar) » June 13th, 2012, 9:54 pm

:welcome: ..... :yth: .....and I will be watching.... :ymbringiton:
If you can't fix it by sheer force or cursing......then it can't be fixed.....
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Re: New guy first time builder 250 gallon reverse flow.

Postby k.a.m. » June 14th, 2012, 6:36 am

Welcome to the site cclark. Your tank size hits on the calculator but your firebox comes in a little small at 27.4. Personally I would increase to 28" square but I like slightly larger fireboxes.
1/3 volume of your tank is 20724.00 while a 27.4 square firebox is 20570.82. A 28"
square firebox will have a volume of 21952.00.
With the 28" firebox the ff/cc opening needs to be 175.62 Sq.in. A half moon of 21.5" x 10" 3/4" will give you an opening of 181.5 Sq.in. The added room will allow for a grease bridge on the bottom to keep accidental overflow into your firebox.
I would use 1/4" minimum for my R/F plate.
Make sure you leave at least your firebox to cooking chamber opening at the opposite end of the of the R/F plate so no bottle necking occurs.
I would add a secondary drain in the lower chamber for clean out.
I hope this helps. :)
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Re: New guy first time builder 250 gallon reverse flow.

Postby cclark » June 14th, 2012, 7:46 am

yea i was probably gonna round up to a 28" firebox...a little extra cant hurt. When you say a "A half moon of 21.5" x 10" 3/4" will give you an opening of 181.5 Sq.in" Im assuming you mean 21.5" wide and at the highest point being 10" tall? Just trying to get all this right before i begin. Thanks again
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