The Baltimore Bridge

[OldFartTom]

For those of you who don't know what a cat unit it, it's fluid hydraulic catalytic cracking. I think there are about 12 of these units in the world. It makes high octane fuel on a continuous basis. It's about the size of 40 school busses stacked on top of each other. The process helped the U.S. win World War 2.

Can't believe they're as rare as that, I did a couple of jobs (back in the day, before I did office work, been up both their big chimneys, get a great view) at a site that ran one (https://en.m.wikipedia.org/wiki/Lindsey_Oil_Refinery) and their competitor situated next door has one too (https://en.m.wikipedia.org/wiki/Humber_Refinery)

[mtpockets]

This video breaks it down a bit, for the impatient types, the impact analogy starts around 5:15

[mtpockets]