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Question: The line length between a pump and motor is 6.0 ft. A crossover relief valve is placed at the midpoint between the pump and motor as shown in Fig. Total pressure drop through the crossover relief valve at a flow of 27 GPM is 25 psi. The line has an elbow at the pump and an elbow at the motor. The following parameters are given.

2064_Elbow.png

Line diameter                           D = 0.75 in

Fluid viscosity                          v = 35 cS

Fluid specific gravity                Sg = 0.9

Find the total pressure drop between the pump and motor.

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