What is dredging and how does it work?

Dredging is a displacement of soil, carried out under water. It serves several different purposes. One of the applications meets the need to maintain minimum depths in canals and harbours by removing mud, sludge, gravel and rocks.

What is a grab dredger?

– Grab dredger – A grab dredger employs a grab mounted on cranes or crane beams. Dredged material is loaded into barges that operate independently.

What is the power output of the dredger?

The dredger is powered by two Wärtsilä 6L32 engines, each of 2760kW MCR output at 750rpm. Each engine drives through reduction gearbox 2500mm diameter CP propeller running at 230 rpm in the nozzle. The maximum power available for propulsion is 2000kW per propeller.

What is a suction dredger used for?

These dredgers are often used to dredge trenches for pipe lines and approach channels in hard soil. Seagoing cutter suction dredgers have their own propulsion.

Equipment: Mechanical dredging involves the use of an excavator or another type of heavy equipment — usually situated on a barge or on the water’s edge — to dig out the bed of the body of water and remove the sediment. The sediment is then hauled away for disposal or reuse.

What equipment is needed for mechanical dredging?

Mechanical dredging projects are typically located near a shoreline. They traditionally require several pieces of support equipment including the primary excavator that mechanically removes the sand and water placing the sand on the shoreline, loaders to move the sand on the shore, and trucks to deposit the sand at a nearby processing plant.

What is the difference between hydraulic and mechanical dredging?

In hydraulic dredging, the sediment is excavated, mixed with water to form slurry which is transported to the dump site. Mechanical dredges use small buckets mounted on a chain to dig, lift, and transport the excavated material.

What are the different types of dredges?

The most common types of dredges are: Plain-Suction: A plain-suction dredge is the most common type of sediment removal equipment. Unlike other dredge versions, it doesn’t contain a tool for penetrating or cutting into the bottom of the water body — it relies on suction to remove loose debris.

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