When I worked the petrochems, the fire protection system ran a couple of V16 DD. We ran these things monthly to exercise them. nothing like firing one of those up and running it WOT.
It takes your breath away to be in the same building with it. Quite impressive to see it pushing a 12in stream of water 150ft out into the emergency basin.
we had built a new process building and they wanted to test the fire control system. 3-4 floors of open structures. they had people with buckets scattered thruout the buildings to check volume delivery. When we fired that DD up the whole building disappeared in a rain storm. I was damned impressed.