How to build a propane burner?

[Coenobita]

Does anyone have some info on building a quality propane burner for a small to medium size Forge?

There are many burner designs online. Personally I have been use a gas forge for almost 20 years and I cannot stress the importance of safety when dealing with propane. Be sure to familiarize yourself with propane gas and its dangers. I strongly suggest using a thermocouple valve/switch with a pilot light. Rexo-therm is a company in Toronto (416)253-9778 that makes 60,000 to 500,000 BTU burners with all the safety requirements attached (ULC listed). I have no financial interest in this company.

I would also suggest avoiding Kaowool or other ceramic board walls as they create airborne silica particles. My suggestion is to pour refractory cement (2000 plus degree rated) as your walls.

Good luck and be safe.