Two summers ago, shortly after I discovered biochar I made my own miniature test biochar kiln out of a 1 gallon paint can and 3 soup cans. The test worked and I did in fact make a small but good batch of biochar.
However the cans significantly aged after only a few cooks. I get that I am producing heat well in excess of what they were designed for. My question is how does a 55 gallon barrel hold up against repeated burns? Does it also age and if not why?
paint cans and such usually have a component of tin as a coating. The structures of these cans are extremely thin and the melting point for tin is very low as it is a very soft metal. metal drums are usually made of steel which is much thicker and is much more heat resistant. As far as I'm aware, no one has burned out one of their barrels on a rocket stove. Ianto has a few that are pretty old, over ten years and they are still fine.
HI Eric, I recently watched a 5 series video on biochar and in one of them he said that a 55 gallon drum lasts him about 10 burns. Can't remember where in the video he said it but here's the link: Making Biochar
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