endsuction

End-suction refers to a common arrangement for centrifugal pumps in which the suction inlet is located on the end of the pump casing, rather than on the side or top. This configuration yields a compact, compactly mounted unit that is often close-coupled to the motor or mounted on a baseplate with a separate driver. The discharge port is typically on the top or opposite side of the casing, depending on model.

Most end-suction pumps are single-stage and single-suction, with a volute or semi-axial flow path that directs liquid from the impeller to the discharge. Variants include close-coupled units, where the pump and motor share a common shaft, and frame-mounted units, where a coupling connects a separate motor to the pump. Multistage end-suction pumps exist for higher head requirements, but single-stage end-suction pumps remain the most common in general service.

Common applications include water supply, HVAC and chilled-water systems, circulation and process fluids in light industry, firefighting pumps, and various chemical and petrochemical service environments. They are valued for compact footprint, straightforward maintenance, and wide availability of materials and coatings to match different liquids.

Design considerations typically cover materials of construction (cast iron, stainless steel, or other alloys), seal type (mechanical seal or packing), and NPSH characteristics. End-suction pumps are not normally self-priming, so proper filling of the suction line is required for operation. The arrangement provides ease of service and replacement, contributing to its widespread use in general purpose pumping applications.