Water (temperature=68f) is pumped from a reservoir to a storage tank atop a building by means of a centrifugal pump. there is 200-ft difference in elevation between the two water surfaces. the inlet pipe at the reservoir is 8ft below the surface, and local conditions are such that the level is substantially constant. the storage tank is vented to the atmosphere and the liquid level is maintained constant. the inlet pipe to storage tank in 6ft below the surface. the piping system consists of 200-ft of 6-in sched. 40 steel pipe containing 2 90o elbows and open gate valve from the reservoir to the pump, 6-in pipe follows the pump for a length of 75-ft after after which pipe size is reduced to 4-in for 250-ft to the tank. the 4-in pipe contains one open gate valve and 3 90o elbows. it is desired to maintain 625 gpm water flow. if the pump-motor set has overall efficiency of 60%
a. determine the kw and hp rating of the pump.
b. what would be the pumping cost be per day if electricity costs p3.00/kwhr?