Mathematical deviation analysis of characteristic performance points of the turbine condenser pump after bypass modification

This article presents a detailed mathematical deviation analysis of the characteristic performance points of a turbine condenser pump following a bypass system modification. The primary task of the turbine condenser pump is to pump condensate from the condenser into the boiler feedwater system. Additionally, the condensate from the condenser pump serves as cooling water for auxiliary systems, such as ejector system cooling and steam dump device cooling. The condenser pump must operate within its characteristic performance properties to ensure the appropriate flow and pressure required for the uninterrupted operation of these systems. The bypass system, which is essential for directing steam during the start-up and trip of the steam turbine, was modified to improve operational flexibility and reliability. To determine the reliability of the condenser pump after the modification, reliability measurements were performed. The reliability was assessed by comparing the characteristic performance points provided by the manufacturer with the measured characteristic points. These measurements were conducted under both atmospheric and vacuum conditions in the turbine condenser. The results indicate that the deviations between the characteristic performance properties specified by the manufacturer and those measured are negligibly small. Minor deviations due to changes in pressure conditions are reflected in the net positive suction head (NPSH) of the condenser pump, and measurements show that operation with an NPSH greater than 1.5 m remains safe. The remaining deviations in characteristic performance properties are within acceptable limits, amounting to up to 3 %. Overall, the results reveal that the bypass modification does not adversely affect pump performance, and the observed shifts in characteristic performance curves are within tolerable operational limits, ensuring continued reliability and stability of the condenser system. • The reliability measurements of the condenser pump after the bypass modification were performed. • These measurements were conducted under both atmospheric and vacuum conditions in the turbine condenser. • The deviations between the characteristic properties specified by the manufacturer and those measured are negligibly small. • Minor deviations due to changes in pressure conditions are reflected in the net positive suction head and.