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,

Determine the maximum value of Δz where cavitation will not occur.

Transcribed Image Text:

NPSHa = 25.6 ft- Az