Originally Posted by
hmburner
I have tested many burners in my day,and its always on pipe. You start from the top and work your way down. When you get to the bottom,put on a big weave on till it blows through the bottom and out the other side. Start back from the top and meet the cut on the bottom from the other side. I can always tell former fitters by the way they cut pipe.Starting from the bottom makes a slow cut and I would never hire the guy. When I started as a burner,I was always taught that "a fitter can never burn and a burner can never fit"
If you are getting slag in the bottom of the pipe,it means you are using way to low of oxy pressure
As far as tips go: use a bulldog style tip for your torches. They are much tougher and should last about 6 months with a good burner. The americans also call them "fast preheat tips" These work the best with natural gas