I was poking around the small town of Sinclair in Wyoming. This is basically the company town for the large refinery there and in the park there are two old cannons with the sign stating that they were originally bought by the company to be used in the event of a refinery fire. They wanted a way to puncture over heating tanks so they wouldn't explode.

Fantastic stuff.

I poked around on Google and found a brief write-up and some photos of those cannons: https://www.hmdb.org/m.asp?m=89707

(Also fantastic in an old-web way: It includes a page hit counter. It currently shows 801 for all time, and 29 for the year.)