If you continue to dredge below the critical velocity you might end up with a complete blockage of your pipeline, resulting in long delays. When you dredge below the critical velocity, the particles will sink out of suspension and they will start to form a bed of material on the bottom of the pipeline. The critical velocity is ‘the velocity below which the grains in the mixture start falling out of suspension and start forming a layer at the bottom of the pipeline’. Velocity is the speed of the slurry in a certain direction. Therefore, it is important to understand the basics of slurry transport.Īn important factor to be considered when pumping mixtures of soil and water is the critical velocity. The particles in the slurry will settle if there is not enough turbulence to suspend the particles in the liquid. However, the transport of a mixture of solids and water, is more complicated than the transport of solely water, oil or gas, for instance. Pipelines enable us to continuously transport slurry over long distances, with or without the aid of booster stations. Transport of the dredged material via pipeline is therefore referred to as slurry transport. This mixture of solids and water is known as slurry. To transport dredged material such as sand or clay through a pressurised pipeline, it must be mixed with water. Hopper dredgers also use pipelines to transport the soil from the hopper to shore, for instance, in land reclamation projects. Cutter suction dredgers in particular use hydraulic transport. Pipelines are commonly used in dredging to transport the dredged materials from the dredger to the disposal site.
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