4.2.11. A pump is needed to convey 8 cfs of water at 68°F through a 130-ft-long horizontal, ductile iron pipeline to a pressurized tank. The pump and pipeline are installed at an elevation of 10 ft, the water surface elevation in the receiving tank is 20 ft, and the pressure at the top of the tank is 32.3 psi. The pipe has a 15-in.-diameter on the suction side of the pump and a 12-in.-diameter on the discharge side of the pump. If the pump delivers 111 ft of head, determine the pressure head on the discharge side of the pump (in psi) and whether cavitation is a concern on the suction side of the pump? Sketch the system and draw the HGL and EGL.

3) A centrifugal pump delivers water between two reservoirs with a 300 ft. elevation difference (Az). The 12-in diameter suction pipe (f1= 0.020) is 100 ft. long (L1) and the 10-in diameter discharge pipe (f2= 0.026) is 5000 ft. long (L2). The pump has a performance curve defined by the equation: h, = 375 - Q² where h, is the pump head in feet and Q is the discharge in ft/s. a) Calculate the discharge, Q. b) Calculate the NPSHA. Assume standard atmospheric conditions, 60°F water, and a pump elevation 8 ft. above the lower reservoir Az D, L2 2 D, Ly. ft LOM

A submersible, multi-stage centrifugal deep well pump 260 gpm capacity is installed in a well 27 feet below the static water level. Drawndown when pumping at rated capacity is 10 feet. The pump delivers the water into a 25,000 gallons capacity overhead storage tank. Total discharge head developed by pump, including friction in piping is 243 feet. Calculate the diameter of the impeller of this pump in inches if each impeller diameter developed at a head of 38 ft. .

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