Specifications include, but are not limited to: Pump construction shall be a vertical, bottom suction, solids handling centrifugal pump complete (without motor and extended drive shaft). The pump shall be designed to pump unscreened raw sewage containing solids and stringy material without clogging and shall operate at stepless variable speed from 65% to 100% full speed without excessive vibration or noise. Pump Construction 1) Casing: Pump casing shall be of the one-piece volute type with an integral discharge nozzle. Twin or double volute casings will not be accepted. The casing shall be made of close-grained cast iron conforming to ASTM A278 Class 30 nominal .75” thickness and ribbed to provide accurate alignment and prevent excessive deflection. The casing shall be designed to permit the removal of the rotating assembly without disturbing the suction or discharge connections and provided with a large handhole to permit inspection and cleaning of the pump interior. The handhole cover shall be bolted, and its inner contour shall match the contour of the casing. Three lifting eyes minimum shall be furnished to facilitate handling. Each casing shall be hydrostatically tested to 200 psi minimum and provided with vent, drain, and gauge connections. 2) Suction Head: Suctions heads shall be provided as part of the pumps, of the same material as the casing, designed to provide equal flow distribution to the impeller eye. Suction head shall be provided with minimum 6” diameter handhole to permit inspection and cleaning. The handhole cover shall be bolted, and its inner contour shall match the contour of the interior. Bottom of suction head shall provide a 12” ANSI 125 pound bolt circle.
