Manufacturers of pumps normally supply how many pump curves?

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The main idea is to have a concise set of curves that show how a pump will perform across operating points. A pump datasheet always includes the primary head-versus-flow curve so you can see how much head the pump provides at different flows. Many manufacturers also include additional curves for efficiency and for the power (horsepower) required at those flows. Because you typically get one core curve and, at most, two extra curves, the usual package is 1 to 3 curves. This combination lets you assess performance, energy use, and motor requirements for proper pump selection and operation.