Feature low NPSH: Coping with poor suction conditions or low NPSH

摘要

Many books, articles and papers have detailed descriptions of NPSH and its importance in pumping systems. However, according to Mike Buhagiar, a senior saies engineer at AxFlow Limited who specialises in pumps for the process industry, there is still a wide lack of understanding of what it really means. NPSH stands for Net Positive Suction Head above Vapour Pressure. A normal centrifugal pump needs an adequate amount of NPSH which is referred referred to as the NPSH required or NPSHr and is primarily a function of the flow rate, pump speed, impeller eye and casing inlet design.