An artefact which is a stack or an assembly of heavy-duty valves intended to be attached to the top of the casing to control the well pressure.

A sealless centrifugal pump where both the impeller and the motor rotor are surrounded by the pumped liquid and where a liner (can) is placed between rotor and stator to isolate the stator from the pumped liquid.

A dynamic pump that contains impellers provided with vanes to generate centrifugal force to achieve the required pressure head.

An electric cable intended for transmission of electric power.

A pump that utilizes a liquid annulus held by centrifugal force around the inside of a casing by a single rotor-impeller to compress vapour isothermically.