The entrance of a centrifugal pump is located 4.4 m above the free surface of a sump tank from which water is pumped to a storage tank at the rate of 0.6 Lsí1 . The diameter of suction pipe is 25 mm...

The entrance of a centrifugal pump is located 4.4 m above the free surface of a sump tank from which water is pumped to a storage tank at the rate of 0.6 Lsí1 . The diameter of suction pipe is 25 mm and its length is 7.2 m. There are three 90° elbows in the pipe. The atmospheric pressure is 101 kPa and the water temperature is 40°C. (i) Calculate the available NPSH. (ii) How much further can the pump entrance be moved vertically before the available NPSH becomes just equal to the manufacturer-recommended NPSH of 2.2 m for the given conditions.