500 gallon build.lp tank

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Got this tank for 100$ and I love to cook and sell BBQ on the side. It's 500 gallon I have another 500gallon tank and was wondering if I should use that for my fb. Just cut it down and weld it. I'm thinking duel 6 inch stacks will work just fine at grate level.
 
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A single 10" stack about 35" above the CC will work well...

I'm a fan of rectangular fire boxes...  easier fit up... easier doors...  easier air inlets...  easier ash dumps...  and the RF is lower in the CC for more grate area....

Stack ideas....

 
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This will be an offset smoker. I need to find what my fb will be made out of. I have 4 ideas. A 120gallon ish fuel oil tank 44x 27 oval . A 85 gallon water pressure tank 44x 27tank 1/8th inch . A 500 gallon lp tank cut down to size for the firebox 37x36 . Or make one out of 1/4 inch steel 36x36x36... on another note will a singe 6.5 inch smoke stack work.
 
Been a while since i posted. So i picked up a lincoln welder. And started on my smoker.... first was to cut the doors out the first do
or was cut with an angle grinder. And finished with a sawzall. I made the handles and hinges for it from 1/2" bar stock.
 
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I am starting a 500 Gallon as well.

I cut the doors 225mm from 12 o'clock and 75mm below 3 o'clock to lower the door weight and get 3 racks in there.

1/2" bar stock maybe a little on the weak side and constantly beend out of alignment with a door of that weight.

my 2 pesos

 
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You could turn your reverse flow plate into a water pan/ grease cather. That's how my smoker works. Be warned it sucks cleaning it out I put my sludge in old bottles and take to a recycle plant monthly
 
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