Abstract: A method of pumping and related arrangement for multi-phase fluid flow wherein a centrifugal pump is used for the suction and delivery of the multi-phase fluid which has a fluid communication providing portion to provide a communication of fluid bled from the outlet at a higher pressure to be injected into the inlet conduit of the centrifugal pump in operation. The centrifugal pump is provided with an impeller which has a plurality of vanes configured to define there between larger passageways when compared to a conventional centrifugal pump which would operate in or near optimum conditions when pumping liquid only.

Abstract: A pumping system including a pump having an inlet and an outlet, an inlet conduit connected to the inlet of the pump for the inlet flow of fluid to the pump. A delivery conduit connected to the outlet of the pump for the outlet flow of fluid from the pump. A point of bleeding at least part of the outlet flow. A mechanism of increasing the velocity head of bleed fluid flow, and a mechanism to inject a flow responsive to the condition of bleed fluid flow into the inlet conduit whereby in operation the injected flow increases at least the velocity head of inlet flow of fluid to the pump.