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EBARA Submersible Sewage Pumps DLFU Specifications A. General: Provide submersible sewage pumps suitable for continuous duty operation underwater without loss of watertight integrity to a depth of 65 feet. Pump system design shall include a guide rail system be such that the pump will be automatically connected to the discharge piping when lowered into place on the discharge connection.The pump shall be easily removable for inspection or service, requiring no bolts, nuts, or other fasteners to be disconnected, or the need for personnel to enter the wet well.The motor and pump shall be designed, manufactured, and assembled by the same manufacturer. B. Manufacturer: EBARA International Corporation C. Pump Characteristics: Pumps shall conform to the following requirements: See Pump Curve Number of units Design flow(gpm) Design TDH (ft) Minimum shut off head(ft) RPM 1800 Maximum HP Minimum efficiency at design (%) Minimum power factor at design (%) Voltage/HZ 208/230V 60V/60 Phase 3 D. Pump Construction: All major parts of the pumping unit(s) including casing, impeller,suction cover,wear rings, motor frame and discharge elbow shall be manufactured from gray cast iron,ASTM A-48 Class 30. Castings shall have smooth surfaces devoid of blow holes or other casting irregularities. Casing design shall be centerline discharge with a large radius on the cut water to prevent clogging. Units shall be furnished with a discharge elbow and 125 lb.flat face ANSI flange.All exposed bolts and nuts shall be 304 stainless steel.All mating surfaces of major components shall be machined and fitted with NBR 0-rings where watertight sealing is required. Machining and fitting shall be such that sealing is accomplished by automatic compression of 0-rings in two planes and 0-ring contact is made on four surfaces without the requirement of specific torque limits. Internal and external surfaces are prepared to SPPC-VISI-SP-3-63 then coated with a zinc-chromate primer.The'extemal surfaces are then coated with a H.B.Teneme-Tar 46H-413 Polyamide Epoxy-Coal Tar paint 1. Impellers: a. 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 be designed such that it may be adjusted to maintain working clearances and hydraulic efficiencies. b. For units 71b 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 EBARA Fluid Handling www.pumpsebara.com 2-159 EWRRA (t)803 327 5005 • (t)803 327 5097 rev.10/11