The intended purpose for this torch is to heat an aluminum melting furnace (coming soon to an instructable near you!). Since I'm using it strictly as an area heating device, I'm not too concerned with the flame quality. I haven't tried it out in a furnace since that piece is yet to be built.
This burner is Lionel's "Oliver-Upwind" Burner design over at http://www.backyardmetalcasting.com/
Specific Link: http://www.backyardmetalcasting.com/oliverburner1.html
This is by far the simplest burner design I have found, and he does a pretty decent job of explaining the process. I improved the design slightly and have some suggestions for construction.
SAFETY Statement : Fire is hot, propane is potentially explosive, power tools and welders can hurt you in many spectacular fashions. Please take proper precautions to avoid losing eyebrows and digits.
Step 1: Materials
- High Pressure / High Volume Propane Regulator
- 6 Foot Braided Steel Propane Hose
- 1/8" ID Black Pipe and Connectors
- #57 Drill Bit
- 3/4" ID Steel pipe
- Old rusty propane tank
The propane regulator I found is variable from 3-35 PSI, and was the most costly part of this build at ~$40. Hopefully I'll get a lot of life out of it. The 3/4" ID pipe was one that I had laying around, and is not the same size as 3/4" black pipe.
Note that you can mix brass and black pipe fittings to get whatever configuration you need. Brass connectors are more expensive, so use whatever black pipe pieces you can find.
Notice that "Higher Pressure" in propane terms doesn't mean the same thing as regular compressed air. Most BBQ grills run at 3 - 5 psi, and the big turkey fryers run at 15 psi.
I probably have my regulator set at ~18 psi. I could have saved $30 by getting a fixed 15 psi regulator, but this one looks a lot cooler (definitely makes it worth the extra $25...).