Abstract
Dredge pumps are designed with sufficient clearances to accommodate occasional gravel, rocks, and other debris passing through the pump without jamming. The fluid pumped is called a slurry, which means the water contains suspended solids (gravel, sand, clay, and silt). The slurry has a variable specific gravity and a highly variable viscosity. Dredge pump characteristics typically are described by curves or graphs that show the variation of head, brake horsepower, and efficiency as a function of volumetric flow rate of water. Dimensional characteristic curves require separate curves for each pump speed, impeller diameter, and specific gravity of mixture. The most common parameter used for evaluating cavitation in pumps is the net positive suction head available produced for a given discharge or flow rate. Large laboratory test facilities are needed to test dredge pumps and develop the pump characteristic curves.
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