A centrifugal pump has a rotating impeller in a chamber and a motor to turn the impeller. Centrifugal pumps come in two forms: horizontal pumps, with horizontal impeller shafts and vertical impellers, and vertical pumps, with an opposite orientation, like a sump pump. You can often notice problems with a centrifugal pump by the sound the pump makes or a change in the pump's rate of discharge or suction. There are five problems that are directly observable when the pump is in operation and three problems that can be ascertained from the pump's maintenance files.
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In-line pumps

Suber-water pumps

Screw pumps