Isaiah Streblow

Thanks for the answers, everybody. I'll probably build a smaller forge, as I'm continuing to go over posts and see the common sizes, and also thanks to Mikey and Irondragon's advice. So, just to confirm - if I do decide to go ahead with the 14" x 20", I would need four burners to heat the entire 1500 cu. in. space, but I could build a baffle wall halfway in, reduce the volume to ~700 cu. in., and heat with two burners if necessary?

Hey, everybody, first time posting. Working on building my first proper propane forge (emphasis on proper, I built one before that was trash) and I'm dumb, honestly. I'm reading that a 3/4" T-burner will heat 350 cu. in. of space, and I'm not sure how people are getting that figure. Do you calculate the space of the forge before or after insulation/forge floor? For example, I'm thinking of using a tank shell that's 14" in diameter and 20" long. I'm guessing two burners would be adequate, since I've seen a couple 7 gal. propane tank builds on here with two burners, and I believe those are 12" x 24". However, even figuring 2" of ceramic wool all the way around the inside of a 14" x 20" tank, that's still 1500+cu. in.... right? I'm sure the solution here is obvious and my sleep-deprived brain isn't seeing it, but I'm primarily wondering a) whether the tank I'm considering for a shell is way too big for beginner work and I should drastically scale down, and b) am I calculating the forge size/number of burners correctly, or not at all? Thanks for bearing with my questions, Isaiah