The Grundfos HS horizontal centrifugal pump is a single-stage non self suction axial centrifugal volute pump. The middle opening design facilitates the disassembly of the pump cover and internal components of the pump (bearings, wear rings, blades, and shaft seals) without obstructing the motor or piping. The bearing housing is designed independently and can be maintained and repaired without disassembling the top cover. The double volute design reduces the radial load on the shaft, extends the service life of the seal and bearings, reduces vibration, and enables the pump to operate quietly. The entire series of HS water pumps have high efficiency performance. High energy efficiency, long service life, and easy maintenance and repair, thereby reducing lifecycle costs. HS pumps come in three configurations - pumps with motors and bases, pumps with bases, and