8.36 A fire hose and nozzle assembly is being designed to deliver 0.75 ft3/s of water. The...

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8.36 A fire hose and nozzle assembly is being designed to deliver 0.75 ft3/s of water. The hose is 3 in. in diameter with a relative roughness of 0.004. The fire hose is made up of four 60 ft sections joined by couplings. The hose connection to the hydrant is squareedged.

The nozzle is a gradual contraction with a 90 included angle and an exit diameter of 1 in. Determine the supply pressure required. Under operating conditions two more sections might be coupled to the hose. Determine the flow rate with this situation for the design supply pressure assuming the friction factor is the same as for design conditions.

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