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In many engineering applications, the operational conditions do not permit that a centrifugal pump works with the rotational speeds indicated in the catalogs (“standards”). In such a case, some professionals of the field have difficulties to obtain a reliable estimation of the H(Q) and NPSH(Q) performance curves for the chosen speed. It is shown that the use of homologous points provides good results only for the H(Q) curve estimation and that this methodology cannot be applied for the NPSH(Q) curve determination, only under certain conditions suggested.

Curva NPSH(Q) de uma Bomba Centrífuga Radial para Rotações Não Padronizadas