A centrifugal pump lifts water under a static head of 50 m and is to deliver water at the rate of 80 m3/ℎ when rotating at 1450 rpm. The losses in the suction and delivery line are estimated to be 25 / and 10 J/kg respectively at the specified flow rate. The bore of the delivery line is 0.823 m. Calculate the NPSE available at the suction of the pump if the thoma parameter 0.115, assume the vapour head of water at 20℃ to be 0.26 m at atmospheric pressure of 1.2 bar. Comment on the risk of cavitation if the NPSE required is 50J/kg