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EBARA Submersible Sewage Pumps DLFU Specifications the pumpage.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(tungsten carbide for 150-300 DLF 50&60 HP only), upper faces carbon vs. ceramic, NBR elastomers, and 304SS Hardware. Seal system shall not rely on pumping medium for lubrication. E. Motor Construction: The pump motor shall be an air filled induction type with a squirrel cage rotor,shell type design, built to NEMA MG-1, Design B specifications. Stator windings shall be copper, insulated with moisture resistant Class H insulation, rated for 356°F.The stator shall be dipped and baked three times in Class H varnish and heat shrunk fitted into the stator housing. Rotor bars and short circuit rings shall be manufactured of cast aluminum. Motor shaft shall be one piece AIS1403 for 2 to 5 HP, AIS1420 for 71h to 60 HP, rotating on two permanently lubricated ball bearings designed for a minimum B-10 life of 60,000 hours. Motor service factor shall be 1.15 and capable of up to 20 starts per hour.The motor shall be designed for continuous duty pumping at a maximum sump temperature of 104°F.Voltage and frequency tolerances shall be a maximum 10/5%respectively. Motor over temperature protection shall be provided by miniature thermal protectors embedded in the windings. Mechanical seal failure protection shall be provided by a mechanical float switch located in a chamber above the seal.This switch shall be comprised of a magnetic float that actuates a dry reed switch encapsulated within the stem. Should the mechanical seal fail, liquid shall be directed into the float chamber, in which the rising liquid activates the switch opening the normally closed circuit. For units 2 to 30 HP the float body and float shall be a polypropylene material with a 316SS stopper. Units 40 HP and greater, the float switch components shall be 304SS.The motor shall be non-overloading over the entire specified range of operation and be able to operate at full,load intermittently while unsubmerged without damage to the unit. Power cable jacket shall be manufactured of an oil resistant chloroprene rubber material, designed for submerged applications.Cable shall be watertight to a depth of a least 65'.The cable entry system shall comprise of primary, secondary, and tertiary sealing methods.The primary seal shall be achieved by a cylindrical elastomeric grommet compressed between the motor cover and a 304SS washer. Secondary sealing is accomplished with a compressed 0-ring made of NBR material. Compression and subsequent sealing shall preclude specific torque requirements.The system shall also include tertiary sealing to prevent leakage into the motor housing due to capillary action through the insulation if the cable is damaged or cut.The cable wires shall be cut, stripped, re-connected with a copper butt end connector,and embedded in epoxy within the cable gland.This provides a dead end for leakage through the cable insulation into the motor junction area.The cable entry system shall be the same for both the power and control cables. F. Guide Rail system: Design shall include two(2)304SS schedule 40 guide rails sized to mount directly to the quick discharge connector, QDC, at the floor of the wetwell and to a guide rail bracket at the top of the wetwell below the hatch opening, (refer to project drawings). Intermediate guide brackets are recommended for rail lengths over 15 feet. Guide rails are not part of the pump package and shall be supplied by others. The QDC shall be manufactured of cast iron,ASTM A48 Class 30. It shall be designed to adequately support the guide rails, discharge piping, and pumping unit under both static and dynamic loading conditions with support legs that are suitable for anchoring it to the wetwell floor.The face of the inlet QDC flange shall be perpendicular to the floor of the wetwell.The discharge flange of the QDC shall conform to ANSI 1316.1 Class 125. The pump design-shall include an integral self-aligning sliding bracket. Sealing of the pumping unit to the QDC shall be accomplished by a single, linear,downward motion of the pump.The entire weight of the pump unit shall be guided to and wedged tightly against the inlet flange of the QDC, making metal to metal contact with the pump discharge forming a seal without the use of bolts, gaskets or 0-rings. A stainless steel lifting chain of adequate length for removing and installing the pump unit is recommended.The chain shall have a round link with a 2-'/4" inside diameter every two feet.This link will allow for a sliding pinch bar through the link to pick the chain, more than once if necessary, at multiple intervals during pump removal and installation. EBARA Fluid Handling www.pumpsebara.com 2-161 EaAaA (t)803 327 5005 • (f)803 327 5097 rev.10/11