Abstract: A subsea pump system includes a subsea centrifugal pump with a motor compartment and a process compartment. The subsea pump system further includes a liquid phase separator arranged downstream to the pump or downstream to at least one pump impeller. The liquid phase separator includes an inlet receiving the pressure boosted fluid, an outlet delivering a majority, or a minor part, of the pressure boosted fluid, and a liquid phase outlet, a liquid recirculation line, a flow mixer arranged on the inlet side of the pump, and a liquid lubricant line.

Abstract: The invention provides a subsea pump system, comprising a subsea centrifugal pump with a motor compartment and a process compartment, wherein the motor compartment is separate from the process compartment and comprises an electric motor or stator driving a motor shaft, wherein the process compartment comprises a pump arranged on a pump rotor, an inlet for fluid and an outlet for pressure boosted fluid, and wherein the motor shaft via a coupling preferably drives the pump rotor.