270. A pump will be installed below the reservoir water surface with a required net positive

suction head (NPSHR) of 50 ft. The barometric pressure is 14.3 psia, and the vapor pressure is

0.5 psia. Assume friction losses in the intake piping are 5 ft. Find the maximum allowable

elevation of the pump relative to the water surface intake to avoid cavitation.

A. 45 ft B. 55 ft C. 18.2 ft D. 23.2 ft