The mixture is then pumped out and the cycle repeated. The inlets are then opened and water and material drawn in. A chamber with inlets for bed material is pumped out with the inlets closed. Pneumatic dredgers work on the evacutor principle. Cutter suction dredgers are suitable to dredge hard soil or to pump o\up large amounts of sand in shallow water.Īugur suction operates in the same manner as the cutter suction, except that the mechanical cutting tool is a rotating Archimedean screw placed at right angles to the suction pipe. When the hopper is full, the ship sails to its destination, the reclamation area.Ĭutter suction has to be towed to their work site by tugboats. The excess water is drained of via the overflow pipes. Sand pumps transfer the sand dredged up by the suction head into the hold or hopper. When the vessel starts dredging, the ship reduces its speed to some 1 to 2 knots and then lowers the suction pipes on both sides of the ship all the way to the seabed. Suction dredging is mostly done in a very dynamic environment,Ī trailing suction hopper dredger is a large ocean going vessel. Then redeposit the stream material back onto the bottom of the Through a separation system to recover valuable minerals, and TheyĪre commonly used to pull material up from a stream bottom, run Suction dredges are essentially underwater vacuum cleaners.
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