There are different types of suction box of vertical pumping system. In order to understand their relations and differences, the control volume method was used to simulate flow pattern of different suction boxes. The standard k-ε turbulent model and SIMPLEC algorithm were applied in solving the N-S equations. The steady calculation results indicated that the flow patterns of different suction boxes of vertical pumping system were similar to each other. The different kinds of suction boxes were evolved from the pump sump. They can be united if they have essentially the same controlled parameters. It is a useful idea for the design of suction box of vertical pumping system.

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