I am curious to the size pipe I would need to start with so that after it's insulated the opening is big enough that I will not have issues inserting and removing work pieces.
Mine is 10" pipe with two inches of insulation leaving a 6" diamter hole for work pieces. The first time I built it using koawool and stanite. When it needed rebuilt I used cast refactory and I don't like it at all. Doesnt get as hot and takes forever.
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