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This paper discusses the design considerations and operation of submersible centrifugal pumps as well fluid lifting equipment. It will describe mainly pump selection for wells with specific conditions and pump operational problems. Theoretical and technical details will not be discussed here. Pump, as it is defined, is equipment to transfer fluid (gas or liquid) from one place to another. A centrifugal pump is one type of such equipment. Its first application to lifting oil well fluids started a few years after World War l. The striking advantage of this pump is that it could produce more fluid, from greater depth, in limited casing sizes than any other type of pump. It is also unique in that the pump is directly coupled to the driving unit operating down in the hole, a sucker rod pump, for instance, has the driving unit on the surface with the pump or plunger down hole being moved up and down with the rods. The capacity of submersible centrifugal pumps in use in oil well and water flood operations ranges from 250 to 48000 BPD at depths to 5000 feet and below.