I have a forge I'm building from an old 5 gallon compressor tank. Once lined it will be about 4000 cu.in. in volume. In order to get up to forge welding temp (1200°C) I'm trying to decide on one burner or 2. My burner set up I have a venturi style burner made with 2, 1&1/4" - 3/4" reducers with a 10" long x 3/4" pipe nipple. Burner has a #64 (ish) orifice. Drilled into a 1/4" brass nipple mounted in the reducer. (A ron reil burner) I will be insulating with 2" 6# kaowool. Coated with itc-100. Suggestions always welcome.