119. A submersible, multi-stage, centrifugal deep well pump 260 gpm capacity is installed in a

well 27 ft below the static water level and running at 3000 rpm. Drawdown 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 ft.

Calculate the diameter of the impeller of this pump in inches if each impeller diameter

developed a head of 38 ft.

A. 3.28 B. 5.33

C. 3.71 D. 6.34