Increasing the speed of a centrifugal pump will result in an increase in its capacity. Another means of increasing the capacity of a centrifugal pump is to increase the __________.
• Centrifugal pump affinity laws (how flow, head, and power change with speed and impeller size) • Effect of impeller diameter vs. pipe size on pump capacity • Difference between system resistance (piping) and pump characteristics (impeller design)
• Think about which part of the pump actually adds energy to the fluid and directly sets the flow for a given system curve. • Consider what happens to pump capacity if you change the impeller versus only changing the suction or discharge pipe size, while the pump and speed stay the same. • Ask yourself: which change would shift the pump performance curve to a higher flow rate for the same head?
• Review the pump affinity laws: how does flow (Q) relate to impeller diameter and speed? • Verify which component (impeller vs. piping) changes the pump curve itself, not just system friction losses. • Check that the option you choose is something that manufacturers commonly alter to offer "higher capacity" versions of the same pump model.
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