CENTRIFUGAL PUMP CHARACTERISTICS COMPUTATION AND RELIABILITY EVALUATION AT VARIABLE SPEED DRIVEN

In this paper, reliability of a centrifugal pump at different rotational speeds and flow rates are discussed. This article concentrates, methods related to the reliability analysis of pumping system operation by a frequency converter computer controlled located in interface box. Centrifugal pumps are often controlled by adjusting their rotational speed, which affects the resulting flow rate and output pressure of the pumped fluid. Initially, the determination of energy efficiency and reliability based limits for the recommendable operating region of a variable speed driven centrifugal pump is discussed. The main focus is on the free axis type centrifugal pumps, but the studied methods can also be feasible with axial flow pump, gear pump and peripheral flow pump, if allowed by their characteristics. In addition the head and flow of fluid transported at different frequencies of rotation, to produce a map of reliability characteristic curves to verify the similarity rules for pumps recommendable operating region of a variable speed driven (VSD) discussed.