Question

1. Pressures on the suction side and the discharge side of a pump are read by the pressure gauges as (i) vacuum of 250 mm of mercury (specific gravity 13.6) and (ii) 137 kN.m2 respectively. The gauge on the suction side is placed 600 mm below the centreline of the pump whereas the gauge on the discharge side is placed 170 mm above the centreline. If the diameters of the pipes on suction and discharge are 150 mm and 100 mm respectively and the quantity of water to be pumped is 30 litres/s, calculate the power required to drive the pump assuming its efficiency to be 60 %.

Answer 1