![]() ![]() The dredge pump must be capable of maintaining flow in the selected pipe. The inside diameter of the discharge pipe largely determines how much and how far solids can be pumped as well as how much energy must be spent to accomplish the task. Dredge PipelineĪlso ignored is the fact that most of the energy consumed by a dredge is expended to overcome resistance to flow in the discharge pipe. ![]() Dredge pump impeller diameter is seldom considered when assessing the worth of a dredge even though it is the working heart of a centrifugal pump and has a large effect on dredge performance. The reason the two different sized pumps are projected to have the same performance is because they have the same impeller. A dredge, outfitted with the larger pump, could be labeled as being a 16” (suction port size) dredge while in fact possessing no more capacity to move solids than a “smaller” dredge labeled as a 12” (discharge port size) dredge. (Ignore the lines labeled “38” VTD”, they refer to a 38” diameter impeller). Note that the two sets of curves are identical they project identical performance for the two pumps despite the difference in their port sizes. These curves project the performance of two standard Metso dredge pumps, one a 12” x 14” pump and the other a 14” x 16” pump. Bigger is usually more impressive so sizing a dredge in reference to its pump inlet port would seem natural. Others will say it is the diameter of the pump discharge port.Ī typical dredge might have a pump with a 12” (discharge) x 14” (suction) x 40” (impeller diameter) and therefore could be called either a 12” dredge or a 14” dredge.ĭredges may have pump ports that are the same size, however, it is more common for the suction port to be one pipe size larger that the discharge port. ![]() When assessing a dredge one of the first questions that comes to mind is, “What size is it?” Some answer with the diameter of the suction pipe or the pump suction inlet diameter. ![]()
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