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Community Pump Status for Fire Flow Modeling


I'm modeling a community water system in WaterCAD CONNECT Edition 3 ( The system has a pump connected to a reservoir on one side, an elevated tank on the other end, and all the piping in between. When the tank reaches a preset low level, it calls for the pump to turn on, and when full, calls for the pump to turn off.

The fire flow analysis I'm performing is steady-state. What is the most appropriate way to model the available fire flows - with the pump on or off?

Modeling with the pump off provides a conservative available fire flow, but modeling with the pump on provides a better picture of what could be available. Is there solid guidance on this subject?

My system has the potential such that a 60 minute fire at 2,500 gpm could be completely within the tank's operating range and not trigger a pump run cycle.