Iran Nezam Mechanical Design Exam

Practice session

A standard automatic fire sprinkler head has an orifice discharge coefficient of K = 5.6 US (approx. 80.6 metric). If hydraulic calculations under INBR Topic 3 (and NFPA 13) indicate a minimum residual flowing water pressure of P = 16.0 psi (approx. 1.10 bar) at the sprinkler nozzle, what is the design water discharge flow rate Q from this sprinkler head using the formula Q = K * √P?

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