The performance of a lifting pump is numerically predicted using commercial code. This four-stage lifting pump is designed for deep-sea mining. Pressure distribution, head chart, and streamlines are calculated in this paper. The number of blades of impeller in one-stage is 5 and the number of guide vanes is 6. Solid-liquid flow in a pump is analyzed and compared with the result of clean water.


Since 1960's the advanced countries have tried to develop deep sea mineral resources in preparation for the on-land mineral resource exhaustion. Especially, the successful development of deep sea manganese nodules requires developing exploration, mining and transfer technologies simultaneously, among which mining technology includes collecting and lifting technologies of the manganese nodules (Chung, 1994). Lifting system is crucial to achieve the success of the deep-sea mining project, by which manganese nodules are conveyed from the seafloor to the mining ship. The conveying principle can be classified into the hydraulic pumping system and the air lift system according to the fluid dredging type, the continuous line buckets system of the mechanical type and the modular marine mining automation system (Yoon et al., 2003). Among the lifting methods, the hydraulic pump lifting system is situated between the buffer system and the lifting pipe that is connected to the mining ship. The lifting pump, one of the core parts in the hydraulic pump lifting system, need to be designed with multi-stages because it requires a high hydraulic head. In Japan, an 8-stage lifting pump was developed for its offshore experiment (Chung, 1994). KIGAM had developed a few single-stage lifting pumps for on-shore lifting tests (Yoon et al., 2005). But, the centrifugal type turned out not to be suited as lifting pump with required high capacity and head simultaneously.

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