Sewage lifting unit

Single-pump or dual-pump sewage lifting units are used in buildings, including hotels and hospitals, to dispose of domestic waste water and sewage from below the flood level, where it will not run off following a natural gradient. In these cases free-flow impellers are the most common type of impeller.
See Fig. 1 Sewage pump

In refurbished buildings, waste water also needs to be disposed of from above the flood level. To be able to discharge the waste water into the sewer system through small diameter pipelines, the pipe inlet is fitted with cutters or other macerators to reduce the size of solid particles.

Sewage lifting units are complete drainage systems which operate automatically. Water level sensors are integrated in the collecting tank to monitor and control the pumps in combination with a control system. The pumps are started and stopped as a function of the water level.

In small sewage lifting units, the hydraulic system is installed inside the tank; in large units it is installed outside the tank. Sewage lifting units are driven by surface-cooled three-phase or AC motors.