We're designing an ESFR system for a warehouse where the city water can supply enough to meet our 2,000 gpm demand, but the local ordinances prevent a fire pump from being supplied directly by city water lines.
We are planning to install a 13,000 gallon bolted water tank for this reason.
NFPA 22 (2013 Edition) Section 4.1.4 allows tanks to be sized so that the store supply plus automatic fill can support demand over the required duration.
However, Section 4.1.5 requires break tanks to be sized for a 15-minute duration of 150% of the fire pumps rated capacity. 13,000 gallons is enough to supply our demand with the added city refill rate, but is not enough on its own for a 15-minute pump supply duration.
Does Section 4.1.5 apply to my situation?
I'm not using an actual break tank, but the bolted tank is being used in a break tank-like fashion.
Thanks in advance.
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