Note that many pump curves are purely theoretical. A different set of curves for the same casing and impeller are for different speed. The bottom curve shows the smallest diameter impeller for that pump casing. ![]() This has the highest head pressure of any of impellers. The top curve is for the largest diameter impeller that can be used in the pump casing. flow rate (capacity).There are usually several sets of curves for each pump model for various impellers and speeds. These curves show the head (pressure) vs. Pump manufacturers have different performance curves for each standard pump. Most should have a positive inlet pressure to prevent cavitation, which is caused by lack of enough positive inlet pressure to prevent liquid vaporization. ![]() But in some applications, special requirements such as low weight, compact configuration, and low net positive suction head (NPSH) might result in the selection of vertical pumps.Ĭentrifugal pumps usually receive less attention than they deserve. Horizontal pumps are usually more desirable than vertical pump configurations. ![]() They are usually drive by electric motors although steam turbine-driven centrifugal pumps have been used in certain applications. ![]() Courtesy of Sulzer.Ĭentrifugal pumps are widely used in plants and facilities. Centrifugal pumps are widely used in industrial and oil & gas applications.
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