We have an oil storage warehouse project requiring a ceiling density of 0.60 gpm/sqft over 3,000 sqft.
This is basically 30 sprinklers using 1,900 gpm (sprinklers), and 500 gpm (for hoses).
The municipal system is set up with three pumps that run sequentially based on residual system pressure. Each pump is larger than the last. We require Pump 3 to be in operation in order to get the required flow and pressure.
We have conducted a flow test flowing two hydrants, and have not been able to kick Pump 3 into action.
Assuming a K16.8 sprinkler has a 3/4" orifice, 30 heads would only equal a 4" diameter opening. If we can't activate the appropriate pump by opening multiple hydrants, how will we be able to achieve the required flow during a fire?
Has anyone encountered a supply system like this before?
I know that a tank and pump is a solution, but I'm looking for other options. Thanks.
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