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What is centrifugal pump’s NPSHr?

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One common mistake pump novices sometimes make is to overlook a little detail called Net Positive Suction Head (NPSH) when making a pump selection. When considering pump selections the first thing most people are taught is to look for is a selection with high-efficiency, and one where the design condition falls close to the best efficiency point. When operating under an overwhelming mountain of new information the pump novice will sometimes forget to make sure the Net Positive Suction Head Required (NPSHr) characteristics of the pump are suitable for the application. While understandable, this mistake can lead to large problems further down the road. While a pump may potentially provide acceptable performance at lower efficiencies and at a point that is not very close to BEP, a pump that is tasked with operating with inadequate Net Positive Suction Head Available (NPSHa) will see a considerable decrease in the head and flow produced and further deterioration in performance due to internal damage can be expected in relatively short order. As a result, ensuring the NPSHr characteristics of the pump are compatible with the NPSHa characteristics of the system is a critical step in the pump selection process.
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