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Do you know of any circumstances where hydraulic calculations are not required for an NFPA 13D system?

Question asked by wloesche on Apr 28, 2020

Using Table can it be assumed that if the pressure is available, say 50psi, and a flow rate of 31gpm is required for a system, and the system does not exceed 25 feet to the farthest sprinkler, using 3/4" pipe, would an installer need to submit hydraulic calculations to prove it?