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During the first melt I was having problems with backpressure and was compensating by adjusting the regulator starting at 3 psi to preheat, going to 7 for the first melt and then 10 psi for the rest. At the time Id thought Once the troll gets hot it seems to deal with higher pressure better. Now Im thinking that once it gets hot it needs the higher pressure.
This time when the Troll started to surge I was adjusting the burner position in the tuyere until it stopped and leaving the regulator set at 5 psi. I know that just into the last melt the Troll was surging and I moved the burner to get it under control. Thinking back now I remember seeing a small amount of blue flame around the top of the crucible. I think what happened was the gas was only burning in the top half of the furnace and the bottom was basically just getting cold air.
This time when the Troll started to surge I was adjusting the burner position in the tuyere until it stopped and leaving the regulator set at 5 psi. I know that just into the last melt the Troll was surging and I moved the burner to get it under control. Thinking back now I remember seeing a small amount of blue flame around the top of the crucible. I think what happened was the gas was only burning in the top half of the furnace and the bottom was basically just getting cold air.
![Coffee Can 1_25in burner tube.jpg Coffee Can 1_25in burner tube.jpg](https://cdn.imagearchive.com/homemodelenginemachinist/data/attach/30/30478-Coffee-Can-1-25in-burner-tube.jpg)