Circular settlement tanks

The most common form of circular tank scraper is the rotary half bridge This is mounted on a central slewing bearing supported on a tripod assembly and is driven by an end carriage travelling around the periphery of the tank. In addition to the standard half bridge scraper, EWT manufacture twin and triple arm rotary machines. Small bridges are manufactured using a beam structure whereas larger bridges require a lattice or girder structure which gives the required strength without excessive weight. All bridges are manufactured in either steel, which can be finished to customers specification, or aluminium. The end carriage unit incorporates a small electric motor and gearbox which drive onto the peripheral wall via a cast iron wheel fitted with a polyurethane tyre. The unit is designed to give a peripheral speed of between 1.0 and 2.0 metres per minute depending on machine design.

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