We have a newly-installed electric (duty) fire pump, and a back-up diesel fire pump.
Each pump has a 100% required flow capacity for the system (750 gpm each) for the building.
Is it OK to run the two pumps simultaneously during testing - which would result in a 200% flow?
The diesel pump is only intended to be used during power interruption/worst-case, but not with normal power online.
During testing, we release water in the test line (flow meter) - the pressure went down and triggered the cut-in pressure of both the electric and diesel pump which makes it run simultaneously (electric first, then the diesel a few seconds later).
Does this not have a water hammer effect on the system?
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