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Would it not have made sense to start with the gravity system? What with gravity being the least likely power source to fail
The gravity system was designed to run the sprinklers long enough for the building to be evacuated so only a few minutes after which a fire would damage property/plant. The sequence of pumps was designed to keep the sprinklers going as long as possible.
In the early days, contractors would use the fire hoses as coolant on the concrete core drilling machines but the system pressure drop would be detected in the fire station and a fire engine (internal) would turn up, they soon got fed up and contractors were banned from using the hoses.
