Grit Pump

Purpose: The purpose of the grit pump is to transfer grit settled out in the grit chamber to the grit classifier.

Description: The grit pump is a recessed impeller type centrifugal pump specifically designed to pump slurries containing large amounts of abrasive solids. The pump impeller is positioned entirely out of the flow path of the fluid passing through the pump. The recessed position minimizes internal pump wear since pumping energy is imparted to the slurry indirectly by a vortex created by the spinning impeller rather than through direct contact with the impeller. The pump is driven by an electric motor through a multiple V-belt drive. The drive pulleys are selected to provide the speed required for proper pump operation. The grit pump is located in the Clarifier Room of the Operation Building to avoid the need for explosion proof equipment and reduce the size of the Preliminary Treatment room. The pump unit is set in a pit below floor level to provide a straight unobstructed suction line from the grit chamber hopper to the pump.