By Sam Yedidiah (auth.)
Specifically for the pump consumer, this booklet concentrates at the identity and resolution of difficulties linked to latest centrifugal pumps. It offers particular examples on how you can regulate pump functionality for elevated potency and higher qc, which become long term fee discount rates. a few uncomplicated thought is integrated to offer the reader larger knowing of the issues being encountered and attacked.
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Additional info for Centrifugal Pump User’s Guidebook: Problems and Solutions
The data obtained from these tests are the only basis available to determine whether the suction capability of a pump matches the actual operating conditions. In practice, however, these data are not always sufficient. A pump must often operate under conditions that are completely different from the conditions under which it was tested. Certain applications may require that variations in head and NPSH follow a prescribed pattern. Some may require that the pump be able to operate in the presence of cavitation.
Some may require that the pump be able to operate in the presence of cavitation. Others may exclude the presence of cavitation even when hydraulic performance is not affected by it. This list is endless. Another spectrum of problems may arise when the pump operates under conditions that vary with time. These variations may be linked directly to pressure fluctuations in the suction tank and to fluctuations in the liquid level. There may also be fluctuations in the operating speed, pumped-liquid temperature, and flow rate.
Point M where curves A and D intersect, shows the flow rate that the pump will deliver under the present conditions. This point tells us that, when working within the given system, the pump will deliver the flow rate Qa against a total head of Ha. Imagine now that the suction pressure is reduced so that cavitation develops within the pump when it is operating at flow rate Qa. From Figs. 5-2 and 5-3, it can be concluded that, when '$ 500 , ~400 :t . 300 1iOJ Figure 5-9 A graph showing the deterioration of the QH curve at different available NPSH values.