Making a propane gas forge for blacksmithing.
Uses the same venturi burners I made for my smelting furnace, video about those here:

Forge construction from outside in:
Steel water pressure vessel tank
5cm thick ceramic wool
High allumina castable refractory
Refractory bricks for inside base and doors

The ceramic wool is glued to the walls with specific ceramic wool glue and rigidized with colloidal silica (tinted blue with food coloring to check covering).

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