4. A Bell & Gossett Series e-80 5x5x7B centrifugal pump operating at 1770 rpm is fitted with a 6.5-inch impeller. The pump is being used to deliver water from a large tank as shown in Figure P4.54. The head at the operating point of the pump/pipe system is 30 ft. A suction-side pipe analysis reveals that the NPSHa can be calculated by, NPSHa = 25.6 ft-2 Determine the maximum value of Az where cavitation will not occur. FIGURE 14.54 Suction wide of pump/pipe we let used deliver water from a wongank