Benzene at 100°F is pumped through the following system at the rate of 40 GPM. The reservoir is at atmospheric pressure. The gauge pressure at the end of the discharge line is 50 lbf/in^2. The discharge is 10 ft, and the pump suction is 4 ft above the level in the reservoir. The discharge line is 11 2 in. Schedule 40 pipe. The friction in the suction line is known to be 0.5 lbf/in^2, and that in the discharge line is 5.5 lbf/in^2. The mechanical efficiency of the pump is 60%. The density of benzene is 54 lbm/ft^3, and its vapor pressure at 100°F is 3.8 lbf/in.
Calculate
a, the developed head of the pump
b. the total power input
c. If the pump manufacturer specifies a required NPSHR of 10ft (3.05m), will the pump be suitable for this service?
