Evaluating pumping plant performance


H i g h energy costs require that irrigation pumping plants be operated as efficiently as possible. Performance must be evaluated periodically so that the pump operator can determine current pump performance; find out if an inefficient pump is operating as designed; and see if pump performance is adequate or what changes are needed to meet irrigation system requirements. Evaluation should include the following steps: 1. Pump test. This provides data on current performance of the pump by measuring total head developed by the pump, pump discharge, and input power. With these data, overall pumping plant efficiency can be calculated. (The overall efficiency for electric pumping plants includes pump and motor efficiency.) 2. Comparison of pump performance with design performance. Pump performancecharacteristic curves developed by the manufacturer describe design performance. These consist of a head-capacity (H-Q) curve, an efficiency-capacity (E-Q) curve, and in some cases a brake horsepower-capacity (BHP-Q) curve (fig. 1, 2, and 4). By comparing head, efficiency, and brake horsepower measured during the pump test with characteristic curves at the measured capacity, one can determine if the pump is operating as designed. This comparison requires information on the pump model, number of stages, and impeller size in addition to test data. 3. Comparison of pump performance with irrigation system requirements. This step shows whether head and capacity developed by the pump are adequate for head and capacity requirements of the irrigation

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Cite this paper

@inproceedings{Benton2008EvaluatingPP, title={Evaluating pumping plant performance}, author={Roger Benton and Donald L. Lancaster}, year={2008} }