![]() A trailing suction hopper dredger generally stores the dredged material in its own hopper and discharges the left-over water overboard. ![]() A draghead is attached to the end of the pipe and lowered to just above the bed, making it possible to regulate the mixture of sand and water that it takes in. One or two suction pipes run from the vessel to the bed. ![]() The cutter suction dredger discharges the dredged material directly to shore via a floating pipeline or into a barge with a special loading system.Ī trailing suction hopper dredger has large, powerful pumps and engines that enable it to suck up sand, clay, sludge and even gravel from ocean or river beds. Moving the spud carriage causes the cutter suction dredger to move as well (‘stepping’). Steel cables are used to move the ladder or cutter head back and forth, with the spud in the spud carriage as the center of each concentric circle that it describes. One spud pole (the auxiliary spud) passes straight through the vessel, while the other is mounted on a movable spud carriage, which can be moved lengthwise along the vessel or pontoon. On the aft side, the cutter generally has two spud poles. The ladder with cutter head is positioned at the fore of the vessel. The suction tube and cutter head are attached to a ladder. The vacuum force at the suction inlet sucks up the loosened material. A suction inlet located beneath the cutter head (known as the suction mouth) is connected by a suction tube directly to one or more centrifugal pumps. A cutter suction dredger is a stationary or self-propelled vessel that uses a rotating cutter head to loosen the material in the bed (‘cutting’).
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