We depend on various waterways for several daily functions, ranging from transporting goods to commercial fishing and recreation. In coastal areas, sediment accumulation can cause beaches to erode. It can also lead to contamination that poses a threat to aquatic plant and wildlife. For instance, it can reduce the depth of the waterway and prevent the passage of ships. Sedimentation is a naturally occurring process where silt, sand and other debris accumulate on the bottom of rivers, lakes, canals or streams over time. An excessive build-up of sediment can cause a series of issues. Dredges are specialized pieces of equipment that create a vacuum to suck up and pump out the unwanted sediment and debris. This paper describes briefly these two assisting pumping systems.Table Of Contents – Easily Jump To What You’re Looking For:ĭredging means the process of removing accumulated sediment from the bottom or banks of bodies of water, including rivers, lakes or streams. The driving powers of both the systems are high-pressure water. Another method to avoid blockage in the suction side and consequently within the delivery pipeline is to place a peripheral-type educator pump in series with the centrifugal dredge pump between the suction mouth of the dredging system and the centrifugal dredge pump.
This spiral pumping device placed before the centrifugal dredge pump also gives a pre-rotation of the mixture assisting the dredge pump thus increasing overall pumping efficiency of the pumping system. The jets are placed spirally along the inner surface of the pump tube. To reduce abrasion an energy input in the form of high-velocity water jets to the boundary layer was done.
Two types of pumping devices were developed and used in actual dredging. This velocity may sometimes reach the threshold of settling velocity, inducing heterogeneous flow within the pipe that would cause increased abrasion within the inner surface of the suction tube and triggers blockage in the suction side of the centrifugal dredge pump. To reduce suction side losses of an on-board centrifugal dredge pump, normally the suction side velocities are kept comparatively lower. Widely varying particle sizes commonly encountered in dredging situations have a broad range of settling velocities.
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