Impeller for wastewater pumps
The F-max free-flow impeller for waste water pumps from KSB incorporates different distances between its blades, which are arranged in groups with two small and two large distances. Thanks to this asymmetrical blade arrangement, the F-max offers wide free passages ensuring that even larger rigid solids pass easily and are reliably handled by the pump. A further focus when designing the blades was their ability to create a swirl in the hub area. This swirling effect shifts fibres away from the impeller hub and transports them to the outside. Subsequent balancing is no longer required. Since the radial forces and vibrations created by the impeller are usually lower than those of single-channel impellers, the service life of shaft seals and rolling element bearings is increased. Pumps with F-max impellers thus require only minimal maintenance. Replacing the impeller itself is also straightforward. When they rotate, free-flow impellers develop a strong swirl which keeps the solids in the pump casing suspended and, in combination with the inclined suction area, generates an additional flushing action. For transporting acid waste water, too, KSB also supplies impellers made from stainless and acid-resistant duplex steel. It provides protection against pitting and stress corrosion.
Hall A6, Booth 327
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