A pump is used to fill a tank with oil(SG=.9, Vapor pressure = 2.75 psia, viscosity = 4 cP). A pressurized tank is used to fill an elevated tank at a velocity of 5 ft/s. This fanning friction factor has been found to be 0.0056. The feed tank is used to transfer the liquid to the elevated tank 700 feet above the pump and open to the atmosphere. The pump is 5 hP, h=0.6, with an NPSHr of 40 psig. The suction side piping is 100 feet, 2" Schedule 40 carbon steel, and the discharge piping is 1000 feet, 1" schedule 40 carbon steel. Friction loss through fitting and valves may be disregarded. What is the minimum height that the feed tank must be to keep the pump from cavitating.

A pump is used to fill a tank with oil ( SG=.9, Vapor pressure =2.75 psia, viscosity =4cP ). A pressurized tank is used to fill an elevated tank at a velocity of 5ft/s. The fanning friction factor has been found to be 0.0056. The feed tank is used to transfer the liquid to the elevated tank 700 feet above the pump and open to the atmosphere. The pump is 5hP,h=0.6, with an NPSHR of 40 psig. The suction side piping is 100 feet, 2 " Schedule 40 carbon steel, and the discharge piping is 1000 feet, 1n schedule 40 carbon steel. Friction loss through fitting and valves may be disregarded. What is the minimum height that the feed tank must be to keep the pump from cavitating