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Pump Curves Explained A pump curve is one of the most important tools used to select, size, and troubleshoot a pump. It shows how a pump will perform under different operating conditions, helping contractors, engineers, and facility managers choose the right pump for a system. What Is a Pump Curve? A pump curve is a chart provided by the pump manufacturer that shows the relationship between flow rate and head pressure. In simple terms, it tells you how much fluid a pump can move and how much res …