10.14 A four-stage boiler feed pump has suction and discharge lines of 10 cm and 7.5 cm inside diameter. At 3500 rpm, the pump is rated at 0 025 m3 s against a head of 125mwhile handling water at 115 C.

The inlet pressure gage, located 50 cm below the impeller centerline, reads 150 kPa. The pump is to be factory certified by tests at the same flow rate, head rise, and speed, but using water at 27 C. Calculate the NPSHA at the pump inlet in the field installation. Evaluate the suction head that must be used in the factory test to duplicate field suction conditions.