A passive drag head has no additional power being applied at the head and the material to be excavated is scoured by hydraulic flow induced by the suction at the drag head. The drag head can be either active or passive. Trailers move at low speeds suctioning up the seabed material through the drag heads and pipes to the hopper.
At the end of the drag arm, a drag head is attached. Trailing suction hopper dredgers have articulated dredging pipes, known as “drag arms”, that extend to the seabed. Being self-propelled also means they can easily be mobilised to travel from project to project wherever in the world. They are unique in that they use their self-propulsion during excavation of sediment from a borrow area and then can transport the material to the placement area.
Trailing suction hopper dredgers are classified as hydraulic dredgers, that is, a dredger which makes use of centrifugal pumps. Work method of Trailing suction hopper dredgers
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