My 275 gallon oil tank sprung a leak so I cut it to remove it from the cellar. I decided to cut it up to make an iron maiden surrounding stove for 55 gallon drums retorts.
I cut the ends off to make the surround. Notice 1 1/4" moisture vent. This 1 1/4 pipe makes a 90 degree turn down and out the bottom.
This is why I call it the iron maiden. Two hinged halves. This makes it easy to invert the full 55 gallon drum and put it inside and close the maiden halves around the drum.
The tank end serves as the lid.
The cut off drum end serves as the removable bottom of the retort.
The bottom is held on with a pin through the 1 1/4" pipe that sends the gases down and out the bottom.
The idea is to fill the drum with dry wood for charcoal, put on the lid, invert, place inside the iron maiden and fill space with kindling. Set lid on spacers for secondary combustion air. Vent moisture out top pipe until gas will burn then cap the vent forcing gases down and out the bottom to self-sustain the fire and pyrolyze the feed stock inside the barrel/drum.