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Positive Displacement Pumps

By Chemical Engineering |

Pumps are essential equipment in the chemical process industries (CPI). Given the imperatives to reduce production costs and maximize energy efficiency, pump selection is crucial. Knowledge of pumping basics, along with the fluid characteristics for a particular application can help engineers make the best choice. While the majority of pumps in use in CPI plants are kinetic energy pumps (the largest category being centrifugal pumps), positive displacement (PD) pumps are an important class of industrial equipment. The following is a collection of information on several types of PD pumps and an outline of the differences between positive displacement pumps and centrifugal pumps. Selection Starting Point In pump selection, first consider what the expectations of the pump will be. The following parameters must be determined before a pump can be selected: Inlet conditions — To avoid suction problems, the pump should be located as close as possible to the liquid supply Flowrate — The flowrate requirements for the pump should be considered Differential pressure — Smaller pipe size and longer pipe runs reduce initial system cost, but the higher pressure differential raises energy consumption and reduces pump lifetime Liquid characteristics…
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