I use Harris same model shown below but they come in different configurations. I once had the longer one that the scrap yards use but did not care much for it as most of the jobs i did had many confined spaces.
The Harris model below is for propane or city gas, the mixing head does a very good job of mixing the gas's to obtain a hot flame making start up cuts much faster, heavy round stock 6 to 8 inch diameter is a bit tricky to get started but once its hot enough to get o2 going for the burn that shaft is history.
The largest piece of equipment I've cut up was a Bucyrus Erie that was powered by a KT450 Cummins which sold as a core. The counterweight alone was 20,000 pounds. pieces this large don't make the yards very happy.
Cutting up large scrap is like playing a game of pool or chess, you always have to be aware of where that next piece of large metal is going to fall and what might be in the way
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