Dutch hobby build. my first reverse flow project.

Thanks Dave.

Is there a smoker calculator on the internet that calculates in cm's? I only found Feldon's.

My tank diameter is around 25 inch, and lenght 50 inch. Feldon's calculator says

Recommended
Firebox Size

8177.08 cubic in.

Anyhow, this is my tank:

Is it a 100 gallon tank?? I see!

there was a rubber membrane inside ....i think that thing holds 80 gallons...(http://www.deltaline.nl/deltaline/p.../hydrofoorketel-horizontaal-varem/c-24/c-1380)

i was planning on making a firebox out of thick steel, Just a simple design with a simple door and a ashtray underneath it, behind the door.

But now i'm looking here, checking out what everyone is building....and i see some insulated fireboxes.

Can i do without? 

Thank you LenDecaturAL, very useful!

I did some measuring today... i messed up at the start.
The correct length is 42 inch and 24 inch diameter (so how many gallons is it???)
.
The fabricators measurements where measured including the water outlet.

a buddy of mine will bend a box for me.
24x20x20 inch.

this is what i get on feldons calculator....

http://feldoncentral.com/bbqcalcula...24.46&fi=8,4,0,28.80,0.90&fc=9.89,13.98,76.80]Link

Is my box going to be too big? I am going to use an ash pan and a coal basket. 

Thanks for your reply, I will take a good hard look at it again. Because i don't understand the whole story (language & math issue)
Dutch winters are not all that cold, and i'm not planning on using it on very cold days.

edit:

I think i understand, you are calculating with a small FB so you get the measurements for the opening in the CC. 

If i make that horizontal cut in the tank, at 5 1/2 inch, how "deep" should i go then? Is that something important?  

Alright then, back again.
Did not do anything on my smoker for a couple of months.
This weekend i decided that i should take a look, and do some quick measurements, to see howmuch steel i need.

My tank is not thick it is a few mm's....i can lift it on my own.

The firebox and rf plate i'm building will be thicker. 

All and all This will not be a thick smoker, i'm hoping this will not be such a big problem on how the thing will work

It is only welded in the middle, no caps are welded on, so no 

I did the cut for the fb in the cc.

came out not straight....
I need my dads laser, and need to put the tank level on the ground so i can make some straight cuts.

will do that next week.

For the door i'm thinking to do the horizontal cuts first.

And the vertical cuts not al the way.

That way, i can weld on the horizontal flanges, and weld on hinges. Flanges will be blind welded, and i will use those bullet style weld-on hinges at first.

When that is done, i can cut the vertical lines and the thing will come loose. 

I am hoping that i reduce the warping of the door like that.

The horizontal flanges will be welded on with the door off.





I really like the endcap on this thing, gives it a nice touch with the bolts and all.

I'm going to weld it shut on the inside....and cut the pipe of.

Will do something with it for the look...not sure what.

Next thing to do is making the firebox and order some steel.