Abstract
This chapter highlights the areas where the trouble lies in a centrifugal pump that is—upstream of the pump, within the pump itself, or downstream of the pump. It is always advisable to obtain performance data when possible. In the absence of a performance test under flow conditions, it is still often of benefit to obtain a performance evaluation under shut-off conditions. Where the pump cannot be operated, a review with pump or plant operators often leads to potential problem areas, which may then be corrected, and the pumping system operated again to attempt to attain the required flow rate. Only when such questions and any subsequent attempts to correct the flow rate limitation have been completed and the problem remains, removal of the pump for dismantling and inspection/repair is advisable.
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