Sulzer’s range of submersible macerator grinder pumps, type ABS Piranha, contain the most effective cutting system for use in pressure sewer systems. The Piranha pumps have proven themselves to be one of the market’s best ongoing performers, having excellent total lifecycle costs from initial purchase through ongoing operation.
The Piranha PE and S series cutter system features a completely different concept in grinder pump design. The design consists of a lobed rotor cutting element attached to a centrifugal impeller working in tandem with a stationary cutting element fastened to a spiral-grooved bottom plate. The lobed rotor turns inside the stationary cutter designed with wave-shaped castellations. The number of waves is one less than the number of lobes on the rotor. This causes an opening to be formed between the rotor and stationary cutter. The normal pumping action of the impeller causes water and solids to flow into the cutting elements and as the solids are sheared into small particles, they are pumped by the impeller into the discharge pipe. Should any of the finely cut particles try to wedge between the impeller and bottom plate, the outward threaded spiral grooves will move them to the discharge.