Self-cleaning pump sump for removing floating layers and solids that have settled in standardised wastewater shafts.
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Hidrostal Screw Centrifugal Pump
The core component of the Hidrostal PreroClean System is the proven blockage-free Hidrostal screw centrifugal pump. The large channel from the pump entrance to the discharge port enables highly efficient blockage-free operation, which is resistant to large solids as well as long fibrous materials. The screw centrifugal pump is shaped like a paddle wheel impeller, which is extended in the axial direction to form a large, free cross section with a soft transition from the axial to the radial flow direction. The resulting sickle-shaped geometry of the scoop at the entrance is an important construction feature, making it an ideal choice for pumping wastewater.
The Hidrostal PreroClean™ self-cleaning pump sump is a simplified and standardised version of the PREROSTAL™ system. Through the rotating movement of the media before the pump entrance, all the suspended solids and particles are fed into the pump. This cleaning process takes place once per pump cycle. By this process, the pump sump is kept free of any deposits and soiling.
The double basin was developed in order to be mounted in a standard 1.2, 1.5 or 2 meter shaft. Similar to the standard Hidrostal PREROSTAL™ basin, it was built with a partial overflow and a spiral-shaped inlet channel, which assists the skimming off of floating layers at the end of the pump cycle. With this design all floating and solid matter is nearly completely removed thus preventing material from continually collecting and building up in the well.