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The Characteristics of a Vertical Submersible Slurry Pump in Transporting Dredged Slurry

The performance of vertical centrifugal slurry pump is quite different from clear water pump due to presence of solid particles in water. An approach to derive the performance behaviour of a vertical centrifugal pump used for transporting dredged slurry based on detail hydraulic loss analysis has been presented in this paper. The derived analytical data has been compared with experimental results. Performance analysis of a vertical submersible centrifugal slurry pump has been accomplished in two stages. At first, performance characteristics of the centrifugal pump with clear water have been investigated considering an indepth hydraulic loss analysis. Depending on the particle size distribution, the effect of solid particles on the performance characteristics of centrifugal slurry pump has been investigated considering volume fraction of particle size. The homogenous slurry with fine particles has been treated as Newtonian fluid with slurry viscosity and specific gravity. Additional hydraulic losses due to coarse solid particle have been considered for coarse slurry fraction. The performance of the vertical centrifugal slurry pump has been predicted with the accuracies of about 87% and 90 % for respective solid concentration of 18% and 10% by volume near the maximum efficiency point. The drooping performance characteristics at low flow operation have been found deteriorating further with the increase of solid concentration.