A four-stage boiler feed pump has suction and discharge lines of (10 mathrm{~cm}) and (7.5 mathrm{~cm}) inside
Question:
A four-stage boiler feed pump has suction and discharge lines of \(10 \mathrm{~cm}\) and \(7.5 \mathrm{~cm}\) inside diameter. At \(3500 \mathrm{rpm}\), the pump is rated at \(0.025 \mathrm{~m}^{3} / \mathrm{s}\) against a head of \(125 \mathrm{~m}\) while handling water at \(115^{\circ} \mathrm{C}\). The inlet pressure gage, located \(50 \mathrm{~cm}\) below the impeller centerline, reads \(150 \mathrm{kPa}\). The pump is to be factory certified by tests at the same flow rate, head rise, and speed, but using water at \(27^{\circ} \mathrm{C}\). 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.
Step by Step Answer:
Fox And McDonald's Introduction To Fluid Mechanics
ISBN: 9781118912652
9th Edition
Authors: Philip J. Pritchard, John W. Mitchell