1st build and having multiple issues on sizing

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Pig Iron
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1st build and having multiple issues on sizing

Post by Pig Iron » February 19th, 2018, 10:10 am

Ok guys me and my father in law aquired a 500 gallon propane tank smoker project someone else started and lost interest. It has both ends cut out so it measures 36" diameter by 84" long which I figured to be 370 gallon tank volume now and we're wanting to go reverse flow. Problems we are having are sizing the firebox and air inlets size and how many needed. I was told yesterday a 24x24 firebox would probably work but we are planning on renting this unit out when finished so it needs to work correctly. The calculators are just confusing us as each one tells something different... Any help from the seasoned vets on smoker building would be greatly appreciated...ImageImage

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Re: 1st build and having multiple issues on sizing

Post by Big T » February 19th, 2018, 1:22 pm

Image. 32” if you want it even


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Re: RE: Re: 1st build and having multiple issues on sizing

Post by Pig Iron » February 19th, 2018, 5:47 pm

Big T wrote:Image. 32” if you want it even


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So the 24x24 I was told would be too small to operate correctly??? I need 32 minimum is that what your telling me???

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Re: 1st build and having multiple issues on sizingt

Post by Dirtytires » February 19th, 2018, 6:53 pm

Yes. 24x24x24 is severely undersized. The calculator big t ran indicates a 32x32x32 (32,768 sq inches) is required. Since you have a 36 inch pipe I might be tempted to put on a 36x30.25x30.25 (37,442) as it would line up better and not be quite as low to the ground so as not to drag.

And keep in mind that too big is just as hard to control as too small so your target is in the 32,700 square inch range.



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Re: RE: Re: 1st build and having multiple issues on sizingt

Post by Pig Iron » February 19th, 2018, 7:11 pm

Dirtytires wrote:Yes. 24x24x24 is severely undersized. The calculator big t ran indicates a 32x32x32 (32,768 sq inches) is required. Since you have a 36 inch pipe I might be tempted to put on a 36x30.25x30.25 (37,442) as it would line up better and not be quite as low to the ground so as not to drag.

And keep in mind that too big is just as hard to control as too small so your target is in the 32,700 square inch range.
Ok I gotcha so my next question is how far from the floor of the CC should the RF plate be and how far should your cook grates be from the RF plate???

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Re: 1st build and having multiple issues on sizing

Post by Big T » February 19th, 2018, 7:34 pm

I'm sorry I had to cut my answer short earlier but something came up. As DT stated above you can change the dimensions around as long as the FB volume stays the same. The BP needs to be 2''-6'' below the bottom cooking grate, I prefer 3.5''-4'' but anywhere in the range is acceptable. If it's too close the radiant heat will cook the bottom of the meat before the top gets done also if it's too far you don't take advantage of the radiant heat from the BP. A cooker this size requires a large throat so that also plays into the equation, you have to figure the throat and see what you have left to work with. Also on one this size I would recommend a shadow plate if you have room. A shadow plate runs level with the top of the throat on the FB for about the first 25% of the cooker. Normally there's a 1'' air gap between the SP and the BP, this helps eliminate the hot spot right out of the FB. I know this sounds like a lot to take in and it is but if you sketch it out on a piece of paper now and work out the details it'll save you a ton of headache in the long run. You can check out smokerplans.net if you haven't already done so and there may be a set of plans for this size pipe but I'm not sure.


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Re: RE: Re: 1st build and having multiple issues on sizing

Post by Pig Iron » February 19th, 2018, 7:59 pm

Big T wrote:I'm sorry I had to cut my answer short earlier but something came up. As DT stated above you can change the dimensions around as long as the FB volume stays the same. The BP needs to be 2''-6'' below the bottom cooking grate, I prefer 3.5''-4'' but anywhere in the range is acceptable. If it's too close the radiant heat will cook the bottom of the meat before the top gets done also if it's too far you don't take advantage of the radiant heat from the BP. A cooker this size requires a large throat so that also plays into the equation, you have to figure the throat and see what you have left to work with. Also on one this size I would recommend a shadow plate if you have room. A shadow plate runs level with the top of the throat on the FB for about the first 25% of the cooker. Normally there's a 1'' air gap between the SP and the BP, this helps eliminate the hot spot right out of the FB. I know this sounds like a lot to take in and it is but if you sketch it out on a piece of paper now and work out the details it'll save you a ton of headache in the long run. You can check out smokerplans.net if you haven't already done so and there may be a set of plans for this size pipe but I'm not sure.
I do appreciate the answer and help from all of you guys. We will try and figure out some of this so we can get started this weekend but I imagine I'll have more questions as things start to come together. I did see on another post that their is a throat calculator that will give the dimensions for a half moon if I read it correctly but I can't seem to find it... I'm also assuming that if I'm putting a rectangle FB on a tank it will be half moon so if you guys have a link to this calculator I'd much appreciate it

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Re: 1st build and having multiple issues on sizing

Post by Dirtytires » February 19th, 2018, 8:55 pm

It’s all math....just google an “area calculator” and put in your known numbers. You can also make it trapazoid or square but half circle seems to make the most sense.



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Re: RE: Re: 1st build and having multiple issues on sizing

Post by Pig Iron » February 19th, 2018, 8:57 pm

Dirtytires wrote:It’s all math....just google an “area calculator” and put in your known numbers. You can also make it trapazoid or square but half circle seems to make the most sense.
Yea I went back and done some more looking around on the throat thread and found the calculator and got my numbers which helped a bunch

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Re: 1st build and having multiple issues on sizing

Post by Big T » February 19th, 2018, 9:00 pm

I'm glad that you found it. If you need any more help just ask, we'd rather help you get it right the first time than help you figure where you went wrong.


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Re: 1st build and having multiple issues on sizing

Post by Dirtytires » February 19th, 2018, 9:04 pm

:yth:

Less work for everybody....and leave more time for smokin!



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Re: RE: Re: 1st build and having multiple issues on sizing

Post by Pig Iron » February 19th, 2018, 9:09 pm

Big T wrote:I'm glad that you found it. If you need any more help just ask, we'd rather help you get it right the first time than help you figure where you went wrong.
Thanks a bunch


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Re: RE: Re: 1st build and having multiple issues on sizing

Post by Pig Iron » February 19th, 2018, 9:10 pm

Dirtytires wrote::yth:

Less work for everybody....and leave more time for smokin!
Im all for that

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Re: 1st build and having multiple issues on sizing

Post by The Czar » February 19th, 2018, 9:35 pm

Thanks Big T and DT!!! You guys beat RC and Pete to the answer...I’m impressed


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Re: 1st build and having multiple issues on sizing

Post by Big T » February 19th, 2018, 11:57 pm

The Czar wrote:Thanks Big T and DT!!! You guys beat RC and Pete to the answer...I’m impressed


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I think it was past their bedtime =)) =))


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Re: 1st build and having multiple issues on sizing

Post by Dirtytires » February 20th, 2018, 12:48 am

:huh:

I never get it right!



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Re: 1st build and having multiple issues on sizing

Post by Pete Mazz » February 20th, 2018, 5:17 am

Big T wrote:
The Czar wrote:Thanks Big T and DT!!! You guys beat RC and Pete to the answer...I’m impressed


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I think it was past their bedtime =)) =))
How'd you know ? =)) =)) =))


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Re: 1st build and having multiple issues on sizing

Post by The Czar » February 20th, 2018, 8:18 am

I know things


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Re: 1st build and having multiple issues on sizing

Post by Rodcrafter » February 20th, 2018, 9:38 am

Pete Mazz wrote:
Big T wrote:
The Czar wrote:Thanks Big T and DT!!! You guys beat RC and Pete to the answer...I’m impressed


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I think it was past their bedtime =)) =))
How'd you know ? =)) =)) =))

That is exactly what happened to me I went to bed at 9 you rascals.


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Re: 1st build and having multiple issues on sizing

Post by Big T » February 20th, 2018, 8:59 pm

Pete Mazz wrote:
Big T wrote:
The Czar wrote:Thanks Big T and DT!!! You guys beat RC and Pete to the answer...I’m impressed


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I think it was past their bedtime =)) =))
How'd you know ? =)) =)) =))
All of those 5 am posts that y'all make gave it away =))


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Re: 1st build and having multiple issues on sizing

Post by cjohnson28 » April 17th, 2018, 5:43 pm

Pig Iron wrote:
Big T wrote:Image. 32” if you want it even


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So the 24x24 I was told would be too small to operate correctly??? I need 32 minimum is that what your telling me???

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How can I get to this calculator so I can print it out for notes?



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Re: 1st build and having multiple issues on sizing

Post by Big T » April 17th, 2018, 7:27 pm

It's at the top of the main page on the forum, it's listed as pit calculator. It has a little different look now and is more user friendly but it still has all of your dimensions.


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Re: 1st build and having multiple issues on sizing

Post by cjohnson28 » April 18th, 2018, 6:50 am

Big T wrote:It's at the top of the main page on the forum, it's listed as pit calculator. It has a little different look now and is more user friendly but it still has all of your dimensions.

Ok, that’s the one I’m using, the first time I did it it gave an option to print it. No biggie thanks T


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