The use of submersible pumps in sewage and drainage pumping applications has increased greatly in the last decades since they entered the market. The introduction of heavy-duty submersible pumps with motor power ratings exceeding 500 kW has also made them available for central municipal pumping duties. The good service record and high quality standard attained by these pumps has all but excluded the use of conventional pumps in municipal service. Table of Contents 1 Pump Theory ................ ...