Gents,
I actually use torches like above and his nozzle #73 + part of the original burner head for my venturi twin. Preferred that above a self-made burner from galvanized plumbing stuff. Combined the assembly with a flashback valve, 50 psi pressure reducer, hose breaking valve and a 26 lbs propane cylinder.
Only build the burner body from SS 316 Ti and later the choke sliders. Here some specifications, venturi inlet Ø 2 in, 4 in long, burner lance Ø 1,5 in, 12 in long.
Since I use the choke there is a significant reduction of gas consumption but still 2,2 lbs propane gas an hour. Reach temperatures till 1750°F on the work piece and have to figure out if this is enough for welding. During running the forge the burners are cool and steady, but after forging I always disconnect the torches because of the heat of the forge crawls up true burners after shut down.
Don’t talk about freezing gas bottles or else already spoken on other threats.
If there are any ideas to improve my burners please let me know.