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The pipe has to be treated like the coal, it's an item that will be consumed eventually. Standard black iron pipe will last a fair amount of time. Thin walled tubing will last a lot less.

Heat...

For a coal or charcoal forge, this method does help keep the direct blast of air coming through the fuel (that contains that nasty oxidizing oxygen) from directly impinging on the material being...

Most coal forges the air intake is from the bottom (the tuyere) through a cast iron artifice with or without a clinker grate. But coal forges and most charcoal forges have been built using a side...

Put some sort of valve in the air side of the system, then you can balance air input against gas.

This is a problem that has plagued smiths for years. It will come down to personal preference and that will be based on the job at hand. All the feedback so far is spot on. Maybe the best way to...