Propane tank volume question help

Discussion in 'Reverse Flow' started by darkshadow, Jul 2, 2016.

Hello brothers. Back again as I'm finally ready to start the main portion of my build, I was going to do it last year but got my face blown off in a propane related accident!

I was then going to do my build in the winter to be ready now but my dhop was full with a paying welding side job that got me a new multi process welder

Question I have as I lost my calculations, I'm doing my bill out of a 400 pound propane tank and I do not know the volume all the calculators you either need to know the volume in gallons, or it calculates it off of the square tank.

The calculators are giving me a very large firebox to cook chamber opening nearly half of my tank as it's calculating for a larger square tank not a rounded end propane tank.

My tank is 29.875x44.25 inside dimensions.

I post up a it of a build when I redo my numbers.

Oh and the volume of the tank was on the collar which is gone

2. daveomakSmoking GuruOTBS MemberSMF Premier Member

Oh I'm aware Dave, I'm using your calculator (again) for my build, I am just trying to figure out my tank volume.

Plugging my numbers in gives me the volume of a square end tank, and not my curve end propane tank.

Does anyone know a way to get a closer true volume?

4. daveomakSmoking GuruOTBS MemberSMF Premier Member

Taken from the tutorial.......

Volume of the Cook Chamber.... Use the Inside Diameter of the tank... All smoker calculations are based on the volume of the Cook Chamber....

Diameter X Diameter X 0.7854 X Length = Volume in cubic inches / 231 = Volume in gallons

29.8 x 29.8 x 0.7854 x  ~40 length =  ~27,900 cu. in.

That's close enough for a smoker build.....

Last edited: Jul 2, 2016

Good point, so much for NASA though.

6. daveomakSmoking GuruOTBS MemberSMF Premier Member

Do you want a closer number ???

Well I dont want to be one of the guys that couldn't get it right on paper haha!

And trying to find a happy medium, I know a larger firebox and cc/fb is far better then too small.

My plan is to Insulate the INSIDE of the cook chamber with 1000*ceramic wool and stainless so I don't want it too big.

8. daveomakSmoking GuruOTBS MemberSMF Premier Member

So now, with the insulation the ID of the tank will be about 27".......    How will you insulate the dome on the inside.....

I think that idea leaves something to be desired.....