The critical velocity varies with the density of the slurry, the diameter of the pipe, the shape of the particles (Spherical particles settle faster than irregularly-shaped particles) and the gradation of the solids particles. The flow rate at which solids begin to drop out of the mixture and form a bed on the bottom of the pipeline. A cobbled cutter is ineffective at loosening new material and results in low production. A condition in which a rotary cutter is surrounded by oversize material that will not pass through the cutter openings. The vacuum reading obtained when pumping clear water at the target velocity.Īs in a “cobbled rotary cutter”. The forerunner of the modern Linear Cutter dredge. See Linear Cutter.Ī dredge which has a chain ladder digging device fitted to the suction inlet. Occurs when the pump discharges more flow than can be taken into the suction inlet.įull length chain ladder digging device with a tattered reputation.Old technology.
The formation of vapor bubbles in the eye of the pump impeller and the collapse of those bubbles as they travel to an area of higher pressure. A dredge operator with no velocity meter.
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