A hydrocarbon transfer system includes a first structure carrying an articulated arm. The system has at a free end a first connector part, and a vessel comprising a second connector part, wherein each connector part comprises a housing with at least two fluid ducts within the housing. The ducts can be placed into sealing engagement along respective sealing faces, and a locking member for locking the housings of the connector parts together, wherein the fluid ducts in either the first or second connector are connected to a respective fluid swivel or flexible duct section to allow at least partial rotation of the ducts along their longitudinal axis, and are connected to a drive member for jointly rotating the ducts along a centreline of the connector parts.