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EBARA Submersible Sewage Pumps DLFU Specifications connected to the motor shaft with a slip fit, key driven, and secured with an impeller bolt.The design shall include a replaceable cast iron suction cover.The suction cover shall be designed such that it may be adjusted to maintain working clearances and hydraulic efficiencies. c. For high head units with 4"discharge,40 to 60 HP shall have a radial multi-vane, enclosed impeller design. It shall be dynamically balanced and shall be designed for solids handling with a long thrulet without acute turns. The inlet edge of the impeller vanes shall be angled toward the impeller periphery so as to facilitate the release of objects that might otherwise clog the pump.A lip seal shall be located behind the impeller hub to reduce the entry of foreign materials into the mechanical seal area. Impellers shall be direct connected to the motor shaft with a slip fit, key driven, and secured with an impeller bolt.The design shall include a replaceable casing wear ring at the pump suction to maintain working clearances and hydraulic efficiencies. d. For units 6"to 12"discharge sizes,40 to 60 HP,the impeller shall be a mixed flow multi-vane enclosed design. It shall be dynamically balanced and shall be designed for solids handling with a long thrulet without acute turns. The inlet edge of the impeller vanes shall be angled toward the impeller periphery so as to facilitate the release of objects that might otherwise clog the pump.A lip seal shall be located behind the impeller hub to reduce the entry of foreign materials into the seal area. Impellers shall be direct connected to the motor shaft with a slip fit, key driven, and secured with an impeller bolt.The design shall include a replaceable.casing wear ring at the pump suction to maintain working clearances and hydraulic efficiencies. Optional K-series design: e. For units 2 to 5 HP,the impeller shall be radial single or multi-vane,semi-open design. It shall be dynamically balanced and shall be designed for solids handling with a long thrulet without acute turns.The inlet edge of the impeller vanes shall be angled toward the impeller periphery so as to facilitate the release of objects that might otherwise clog the pump.The 2 to 5 HP impeller design shall also include back pump out vanes to reduce the pressure and entry of foreign materials into the mechanical seal area. In addition, a lip seal shall be located behind the impeller hub to further reduce the entry of foreign materials into the seal area. Impellers shall be direct connected to the motor shaft with a slip fit, key driven, and secured with an impeller bolt.The design shall include a replaceable cast iron suction cover.The suction cover shall contain a groove(s) perpendicular to the suction opening to disrupt fibrous solids that may otherwise become lodged between the impeller and suction cover.The suction cover shall be designed such that it may be adjusted to maintain working clearances and hydraulic efficiencies. f. For units 7V2 to 30 HP,the impeller shall be a mixed flow multi-vane semi-open design. It shall be dynamically balanced and shall be designed for solids handling with a long thrulet without acute turns.The inlet edge of the impeller vanes shall be angled toward the impeller periphery so as to facilitate the release of objects that might otherwise clog the pump.The 71h to 30 HP impeller design shall also include back pump out vanes to reduce the pressure and entry of foreign materials into the mechanical seal area. In addition, a lip seal shall be located behind the impeller hub to further reduce the entry of foreign materials into the seal area. Impellers shall be direct connected to the motor shaft with a slip fit, key driven,and secured with an impeller bolt.The design shall include a replaceable cast iron suction cover.The suction cover shall contain a groove(s)perpendicular to the suction opening to disrupt fibrous solids that may otherwise become lodged between the impeller and suction cover.The suction cover shall be designed such that it may be adjusted to maintain working clearances and hydraulic efficiencies. 2. Mechanical Seals a. For units 2 to 5 HP, double mechanical seals operating in an oil bath shall be provided on all units.The oil filled seal chamber shall be designed to prevent over-filling and include an anti-vortexing vane to insure proper lubrication of both seal faces. Lower face materials shall be silicon carbide, upper faces carbon vs.ceramic, NBR elastomers, and 304SS hardware. Seal system shall not rely on pumping medium for lubrication. b. Units 71h to 60 HP shall be designed to include a double mechanical seal in a tandem arrangement. Each seal shall be positively driven and act independently with its own spring system.The upper seal operates in an oil bath,while the lower seal is lubricated by the oil from between the shaft and the seal faces, and in contact with EBARA Fluid Handling www.pumpsebara.com 2-160 EBARA (t)803 327 5005 • (fl 803 327 5097 rev.10/11