I had a oil production chain: Drill, Crude oil storage, Crude Cracker, Chemfuel storage (and other but they're not important here). The drilling wasn't finished, so everything was dry. Not even chemfuel from my storage went into the tanks. One of my pawns went on a tantrum and destroyed the crude cracker, before other pawns could intervene. An explosion occured and fire broke out with chemfuel puddles.

I could expect an explosion. I get that the Cracker is delicate with 150 HP. But I didn't expect to have a Chemfuel firestorm without any Chemfuel nor Crude oil in the system.

Rimworld 1.2.2753
Rimefeller 1.2.944