New 500 gal build

Any type of purchased BBQ Pit.

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banditbbq
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New 500 gal build

Postby banditbbq » Fri Sep 21, 2018 6:02 pm

I am in the planning stages of converting a 500 gal propane tank to an offset smoker on a trailer. I will be cutting 1/2 of one end off the tank to mount my firebox to the end of the tank. My rough estimate for the firebox size is 36x36x36. I plan on insulating the box and the door. I'm thinking 1/4 inch steel inside walls and 3/16 on the outside walls with a minimum of 1" ceramic insulation between. Any advice would be welcomed. How large an opening do I need for the throat? I plan on placing the bottom of the throat about 1 1/2 inches above the bottom of the cook chamber to keep grease out of the firebox. My plan is for a 1/2 moon opening, but being in the planning stages, I am open to suggestions. This is my first build and could use all the advice I can get.
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GRailsback
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Re: New 500 gal build

Postby GRailsback » Mon Sep 24, 2018 10:12 am

You may want to send KAM a PM on here. He will get you pointed in the right direction.
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k.a.m.
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Re: New 500 gal build

Postby k.a.m. » Tue Sep 25, 2018 8:00 pm

banditbbq wrote:I am in the planning stages of converting a 500 gal propane tank to an offset smoker on a trailer. I will be cutting 1/2 of one end off the tank to mount my firebox to the end of the tank. My rough estimate for the firebox size is 36x36x36. I plan on insulating the box and the door. I'm thinking 1/4 inch steel inside walls and 3/16 on the outside walls with a minimum of 1" ceramic insulation between. Any advice would be welcomed. How large an opening do I need for the throat? I plan on placing the bottom of the throat about 1 1/2 inches above the bottom of the cook chamber to keep grease out of the firebox. My plan is for a 1/2 moon opening, but being in the planning stages, I am open to suggestions. This is my first build and could use all the advice I can get.

Here is a filled out link to the calculator I would use.
Link to BBQ Pit Calculator
I would go 2" minimum insulation.
Always remember slow and steady wins the race.



My Hybrid cooker.
Competition trailer #2.
banditbbq
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Re: New 500 gal build

Postby banditbbq » Sun Jan 06, 2019 6:20 pm

The pit is 50 miles from home in a shop where I have access to heavy lifting equipment. We've been working away at the pit. We built a 3'x3'x3' firebox and insulated all sides but the bottom. The smoke stack is an old 9" dia oxygen tank. I don't have a clue how many hours we have in it. It's been very tiring when we can spend time on it, but it sure is fun. I can't wait until I get to bring it home and fire it up for the first time. We'll be recessing it into a 16' trailer and welding it in place. After that I can bring it home and finish out all the details in a little more timely manner.
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Chasdev
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Re: New 500 gal build

Postby Chasdev » Mon Jan 07, 2019 5:42 pm

I could be wrong but that exhaust stack looks too short to me.
banditbbq
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Re: New 500 gal build

Postby banditbbq » Mon Jan 07, 2019 7:18 pm

Chasdev wrote:I could be wrong but that exhaust stack looks too short to me.


Thanks, I'll double check the calculator, but I thought we had it long enough since it is 9.25" I.D.
banditbbq
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Re: New 500 gal build

Postby banditbbq » Sun Jan 13, 2019 6:30 am

banditbbq wrote:
Chasdev wrote:I could be wrong but that exhaust stack looks too short to me.


Thanks, I'll double check the calculator, but I thought we had it long enough since it is 9.25" I.D.


I double checked the calculator, stack is fine because it's 9" in diameter.
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spacetrucker
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Re: New 500 gal build

Postby spacetrucker » Sun Jan 13, 2019 2:35 pm

I like everything I see there just one problem.... its not mine.... :laughing7: :laughing7:
the extra large fire box is a good thing in my opinion, I have cooked on pits like that. Hopefully you have the exhaust at or below the grate level.. are you going in with tuning plates? some day I'm gonna buy me a gas hatchet and a cracker box & build me one of them... :roll: in past we my employees and self bought several feet of large pipe and built ourselves each a pit. There are still all of them somewhere in existence as they will never rust or burn out due to their thickness.
Don't count every day, Make every day Count
Good Cue to ya..

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