The heart of the ESP is the multi stage centrifugal pump. APC centrifugal pumps are multi stage; each stage consists of a rotating impeller and stationary diffuser and the number of stages required is determined by the lift requirements (TDH) of the application. Pumps are selected to deliver the desired flow rate from the largest diameter pump that can be accommodated by the casing ID.
APC centrifugal pumps can be of either radial or mixed flow stage design and are available in both floater and compression configurations for thrust handling. A variety of diameters (series) is offered, covering a wide range of flow rates.