Abstract
Hydraulic dredges are commonly classified as large when the diameter of the pump discharge and discharge pipeline are greater than 12 in. (305 mm). Hydraulic dredges perform both phases of the dredging operations (digging and placement). The basic components of a hydraulic dredge are dredge pumps, digging and agitation machinery, and hoisting and hauling equipment. Hydraulic dredges are categorized as hopper, pipeline, cutter suction, dustpan, bucket wheel, and side casting. The agitation dredge suspends the dredged material and lets the natural currents move the sediments to another location in the dredged channel. A water injection dredge lowers its dredge head into the sediments and injects water into the sediment. Small cutter suction and horizontal auger suction dredges are manufactured by VMI Dredges. The Matchbox dredge is a cutter suction dredge with a modified dredge head called the matchbox.
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