Abstract: A subsea variable speed drive apparatus comprising a pressure resistant container (90) comprising a curved wall section having a curved, internal surface (90a); and a variable speed drive comprising at least one power electronics module (50) arranged inside the container and held at a predetermined ambient pressure. The at least one power electronics module is mounted on a heatsink (40) which is mounted on the internal surface, the heatsink comprising a curved surface (40b) contacting the internal surface and having a radius of curvature corresponding to the radius of curvature of the internal surface. A subsea hydrocarbon fluid pumping system comprising such subsea variable speed drive apparatuses and a related method are also disclosed.

Abstract: A subsea variable speed drive apparatus comprising a pressure resistant container (90) comprising a curved will section having a curved, internal surface (90a); and a variable speed drive comprising at least one power electronics module (50) arranged inside the container and held at a predetermined ambient pressure. The at least one power electronics module is mounted on a heatsink (40) which is mounted on the internal surface, the heatsink comprising a curved surface (40b) contacting the internal surface and having a radius of curvature corresponding to the radius of curvature of the internal surface. A subsea hydrocarbon fluid pumping system comprising such subsea variable speed drive apparatuses and a related method are also disclosed.

Abstract: An electric power generating submarine tool is used in the Oil and Gas Industry, for powering submarine equipments applied for combating hydrate and also for feeding electric systems in submarine equipments of production, processing and transporting hydrocarbons. The tool includes a hydraulic engine of axial piston, a mechanical coupling, an electric power generator, an electric box of hydrostatically balanced delivery, a hydrostatically balanced submarine electric cable, a wet-mate-type submarine electric connector, hydraulic hoses, a compensator for allowing equalization of the internal pressure with the external one. The system is interconnected and driven hydraulically by a ROV.

Abstract: An electric power generating submarine tool is used in the Oil and Gas Industry, for powering submarine equipments applied for combating hydrate and also for feeding electric systems in submarine equipments of production, processing and transporting hydrocarbons. The tool includes a hydraulic engine of axial piston, a mechanical coupling, an electric power generator, an electric box of hydrostatically balanced delivery, a hydrostatically balanced submarine electric cable, a wet-mate-type submarine electric connector, hydraulic hoses, a compensator for allowing equalization of the internal pressure with the external one. The system is interconnected and driven hydraulically by a ROV.