C2-Sewage Pumps DN 32 to DN 600 - 2008.pdf

lSewage Pumps for Municipal and Industrial ApplicationsPlanning GuideSewage pumps of the Wilo EMU product family have a modular structureand can be adapted to different requirements.MotorsThe motor housings are made of grey cast iron. The bearings of themotor shaft are high-quality roller bearings. The motors are designedfor insulation class “F” or “H”. For especially high demands againstcorrosion, the motors can also be coated with Ceram, a liquid ceramicmaterial.CoolingThe motor cooling was realised in different ways. Depending on theconstruction, either oil, water/glycol or air is used as a heat carrier.Oil as well as water/glycol are cooled through a heat exchanger,which conducts the dissipated heat to the fluid. Air-filled T-motorsgive off heat directly to the environment via the housing.Motor overviewMotorCoolantCooling and sealingsystemExFigure: Motor with active closed-circuit cooling and 2-chamber system for wetand dry sump installationF motorOil in the motor2-chamber systemwith passive closedcircuitcooling–FK motorOil in the motor2-chamber systemwith active closedcircuitcooling–FK 17.1 motorOil in the motor2-chamber systemwith active closedcircuitcooling•FO motorOil in the motor2-chamber systemwith passive closedcircuitcooling–FKT 27.1motorDry motor with water/glycol mixture in thecooling circuit2-chamber systemwith active closedcircuitcooling•FKT 49.../56... motorFKT 72 motorDry motor with oil inthe cooling circuitDry motor with oil inthe cooling circuit1-chamber systemwith active closedcircuitcooling2-chamber systemwith active closedcircuitcooling••Figure: Motor with active closed-circuit cooling and 2-chamber system for wetand dry sump installationHC motorDry motor with water/glycol mixture in thehermetically sealedcooling circuit2-chamber systemwith active closedcircuitcoolingT motor Air 1-chamber system •T 20.1 motor Air 1-chamber system ••The motors with a closed-circuit cooling system can be operatedboth submerged and dry in permanent operation. T motors can beimmersed in permanent operation, but can only be operated dry for ashort time. Thus, high process reliability is ensured.Figure: Dry motor for wet sump installation140 Subject to change without prior notice 09/2007 WILO AG