Abstract
In many cases, pumps users start the pumping installation by relying on the contractual characteristic curves supplied by the manufacturer. They also have other curves defining the NPSH in accordance with the flow rate. These curves have been established in extremely special conditions which correspond to the ideal case of a narrow pipeline pump suction with a homogeneous supply and a quasi-uniform approach speed distribution.With the help of some examples, this article seeks to draw attention to the modifications which could affect these curves when the actual installation differs from this ideal situation.
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