7 7. An underground pressurized water tank is used to fill an elevated tank at 100 gpm of water. process. The underground tank is 20 feet below the pump with is used to transfer the liquid to the elevated tank 50 feet above the pump and open to the atmosphere. The pump is 10 hp, n=0.9, with a NPSHR of 30 feet. The suction side piping is 35 feet, 3' Schedule-40 carbon steel, the discharge piping is 65 feet, 2" schedule-40 carbon steel. Friction loss through fitting and valves may be disregarded. What is the minimum pressure in Tank 1 that will allow the pump to work without cavitation? 50 ft 1 20 ft 1