![]() Pump sizing involves matching the flow and pressure rating of a pump with the flowrate and pressure required for the process. Alhough certain system head parameters are calculated the same way whether the driving force for flow is a pump or gravity, this article mainly addresses sizing concerns for rotodynamic pumps. Most process pumps are rotodynamic pumps, so you need to know the required outlet pressure to specify the pump that will provide the required flow. Its output flow tends to vary little with respect to the pressure at the pump outlet, because the moving displacement mechanism pushes the slug of liquid out at a constant rate. This pumping principle produces a pulsating flow, rather than a smooth flow. A gear pump is an example of a PD pump ( Figure 2). In a positive-displacement (PD) pump, a discrete amount of fluid is trapped, forced through the pump, and discharged. ![]() A gear pump is a type of positive-displacement pump in which a discrete volume of fluid is trapped and then discharged. ![]()
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