BMG supplies a range of drives designed specially for optimum efficiency in sewage treatment applications. “Nord drives, which consist of Unicase helical shaft mount geared motors, have special features to meet the requirements of water treatment procedures,” says national product specialist, Deon Crous. “These drives consist of gears, motors and brakes that are protected against corrosion. Special covers for the hollow shaft and motor ensure that the drive is resistant to spray from tanks and the humid and aggressive conditions in sewage treatment plants.” Explosion-proof motors, with electrical and mechanical speed control, are fitted with anti-condensation heaters for stand-still periods and reinforced bearings for extended life are standard. Special vent plugs, lubricants and a valve-type oil drainage facility also enhance performance in these demanding applications.
Drives with helical flange-mounted geared motors have the flexibility to fit into restricted and awkwardly shaped areas below tank de-sludgers. The traversing platform of this system is equipped with four-wheel drive to prevent wheels from slipping, even under load and in unfavourable wind conditions. Drives for revolving de-sludgers (helical bevel geared motors) and propeller-type agitators and aerator drives (helical geared motors, flange mounted) can comfortably handle continuous operation 24 hours a day. Foot mounted helical geared motors are recommended in paddle mixer drives and despite heavy loads, design life can exceed 100 000 hours. A unique feature of these drives is the Unicase gearbox that accommodates all bearing seats within a rigid one-piece casting so that sealing surfaces are not subjected to torque stress or overhung loads.
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