[Awalker]

I just changed my forge from a single burner at an angle in the side to a two burner from the top. The side burner was a Ron Reil 2 x 3/4" bell reducer burner. When I changed to top burners I used a 1 1/2" x 3/4" swage into a 3/4" elbow then into a 4 1/2" nipple and I used a forged 3/4" coupler that I flared the end on. I started out with a #72 drill size orifice but found it to be unstable and wouldn't stay lit. I bored it out to a #65 and it is much more stable but still not as hot as I'd like I am running it around 7 to 12psi. I started out with the #72 orifice as that was what was in a forge I had used previously that ran fine, and would run all day on about 4 gallons of LP. My single burner would use every bit of a a 5 gallon tank in 5 hours (it had a #56 orifice in it running at 17psi). I think I may go back and rebuild the venturi portion of the burner with the 2x3/4 bell reducer, as that seemed to work well on my other burner (I didn't have 2 of them handy or I would have used them on these burners).
After I had it running I played around with injecting some air into it to see if it would burn noticably hotter, and it did. So, I made an additional air injection manifold that stands off the burner a few inches and has a valve I can throttle that is connected to my compressor. It doesn't take a lot of 175# compressed air to make a big difference in the flame characteristics and I was very impressed. I think when I change the swages out I am going to change to a blower as well, the compressor works but adds even more noise and a 7.5 horse motor coming on and off all the time is annoying. With the air injection on I can run the LP pressure around 3 to 7 psi and it gets good and hot in the.
BTW the forge is made of 12" pipe that is 12" long. I added Kaowool when I moved the burners and that made a big difference (it had a firebrick liner before), and it has a brick closure in front and back.
Any thoughts on those burners would be much appreciated.