The disclosure relates to a screw pump (2) comprising: a casing (3) with an inlet (30), an outlet (31) and a flow chamber (32) between the inlet and the outlet, and at least two screws (4, 5, 6) housed in the flow chamber to force a fluid flow 5 through the flow chamber from the inlet to the outlet, wherein each screw (4, 5, 6) comprises a release coupling (45, 52, 62) to restrict, when in use, the rotation of the screw when it is being extracted from a molding tool.

The disclosure relates to a screw pump comprising: a casing with an inlet, an outlet and a flow chamber between the inlet and the outlet; and at least two screws housed in the flow chamber to force a fluid flow through the flow chamber from the inlet to the outlet; wherein at least one of the screws comprises a lubricated polymer material.

A multiphase pump system includes a pump (10) having first and second screw rotors (4) disposed within a pump body (A), and at least one inlet (3) in fluid communication with the first and second screw rotors, respectively. A discharge casing (B) is coupled to the pump body (A) for receiving fluid discharged from the first and second screw rotors (4). The discharge casing (B) is oriented orthogonally or at a non-zero angle with respect to a longitudinal axis of the pump body (A). The discharge casing (B) includes a separation chamber for separating liquid and gas components of the fluid discharged from the first and second screw rotors (4). The pump body (A) includes at least one opening (9) for directing separated liquid from the discharge casing (B) to a discharge chamber of the pump body (A).