Overflow Duct

Sanyang Heavy Machinery dredge overflow systems are available for all sizes of trailing suction hopper dredgers. They are hydraulically operated, and their operation can be fully integrated in the automatic dredging control system if desired.

Sanyang Machinery designs the dredge overflow systems to optimize the efficiency of the dredging process by ensuring the maximum retention of solids.

Dredge overflow drains excess process water overboard. An effective overflow system induces little turbulence, allowing the mixture maximum time to settle. All overflows are designed with the needs of a specific vessel in mind. A good overflow system can significantly raise net production.

Dredge overflow system generally consists of a fixed outer part and a sliding inner part, both tubular. At the top of the moving part is a cone or a rectangular shape. Weir, the purpose of which is to obtain a non-turbulent, uniform flow to encourage settling. The moving part is raised or lowered by means of a hydraulic cylinder attached to the fixed part.

If required, a mechanical or electro-mechanical position indicator can be fitted. The range of the moving part corresponds to the desired minimum and maximum overflow levels. The stroke can be enlarged by the use of a telescopic three-part overflow.