SUBMERSIBLE SEWAGE PUMPS (FLYGT NP 3153 HT 461 OR PRE-APPROVED ALTERNATIVE) A. Each station shall be equipped with TWO (2) submersible, close-coupled wastewater pumps. B. Each pump shall be equipped with a 20 HP submersible electric motor, capable to operate on a 460 volt, 3 phases, 60 hertz voltage supply. C. The hydraulics of the pump shall be capable of handling raw domestic wastewater and storm water with fibrous materials like wet wipes. D. The impeller blades shall be self-cleaning upon each rotation as they pass across a sharp relief groove in the Insert ring and shall keep the impeller blades clear of debris. The clearance between the insert ring and the impeller leading edges shall be adjustable. E. The impeller shall be wear resistant and made of high chromium cast iron with at least 24% chrome against sand and grit which is expected to enter the pump station with the sewage or the storm water. Impellers that have surface hardening (by thermal, coating, etc.) will not be allowed. F. The pump shall be capable of operating without any limitation between 50% and 125% of the Best efficiency point (B.E.P) of the performance curve...
