Reverse flow smoker build help

[C.D.]

Id like to build a reverse flow smoker out of a propane tank it is 30"x150' o need help on the opening sizes.
The calculator gives some help but some numbers like exhaust camber size look huge using an 8 " pipe

 

[pete mazz]

150 feet?

 

[C.D.]

150 feet?

Sorry Pete, my fingers sometimes don't work right. No it's 150 inches.

 

[pete mazz]

That's a 275 gallon tank. 8" stack ~22"

 

[C.D.]

That's a 275 gallon tank.

That's a 275 gallon tank. 8" stack ~22"

 

[C.D.]

Tank inside is 29.25"×150"
According to the calculator it's 436.33
100793.818 cubic in.
It gives 403.175 for a FB/CC opening and RF plate end opening.
I am having trouble with the FB/CC opening, and position of the RF plate compared to the door and racks.

 

[pete mazz]

I must have entered the wrong numbers. Sorry.

My Tank Volume Calcs are here: https://planetcalc.com/5185/

Throat Calcs are here: https://planetcalc.com/5155/

Your throat opening (FB to CC) is way too large. For a 425 gal tank you should be ~288 sq.in.

Typically the top of the FB is the BP height if you're using a square shaped FB. I come up with a 13" high cut-out. That only leaves a couple inches to the lower grate because the tank is so long. Have you thought of shortening it?

 

[C.D.]

I must have entered the wrong numbers. Sorry.

My Tank Volume Calcs are here: https://planetcalc.com/5185/

Throat Calcs are here: https://planetcalc.com/5155/

Your throat opening (FB to CC) is way too large. For a 425 gal tank you should be ~288 sq.in.

Typically the top of the FB is the BP height if you're using a square shaped FB. I come up with a 13" high cut-out. That only leaves a couple inches to the lower grate because the tank is so long. Have you thought of shortening it?

I had but would rather not

I must have entered the wrong numbers. Sorry.

My Tank Volume Calcs are here: https://planetcalc.com/5185/

Throat Calcs are here: https://planetcalc.com/5155/

Your throat opening (FB to CC) is way too large. For a 425 gal tank you should be ~288 sq.in.

Typically the top of the FB is the BP height if you're using a square shaped FB. I come up with a 13" high cut-out. That only leaves a couple inches to the lower grate because the tank is so long. Have you thought of shortening it?

No, but I've thought about just having 1 rack instead of 2