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Net Positive Suction Head (NPSH) is one of the least understood factors that impact a vertical turbine pump's performance and life cycle. This presentation will provide: An overview of the factors that impact and how to calculate NPSH availability (NPSHa) and NPSH required (NPSHr). Definition of the roles that suction lift and suction head play in NPSH. Recommendations on how to ease NPSH issues.