Device for connecting a submerged fluid-transporting line

The present invention relates to the offshore petroleum industry, and it relates more particularly to systems for connecting submerged fluid-transporting lines (all types of "risers") to floating supports (of the following types: floating production, storage and offloading (FPSO) unit; tension leg platform (TLP), submersible pipe-alignment rig (SPAR), buoy, etc.). A connection device for connecting a submerged tubular structure to a floating support structure. The connection device includes first and second tubular connection elements that connect the submerged tubular structure to the floating support structure. The first tubular connection element cooperates with the second tubular connection element to form a first axial abutment in a pulling direction in which the submerged tubular structure is pulled, and a second axial abutment in a direction opposite from the pulling direction. The device further includes a locking and tensioning device that includes at least one actuator secured to the floating support structure and is mounted to pivot on the second tubular connection element about a hinge axis and against the effect of a return spring surrounding the pin so as to enable the first tubular connection element to snap-fasten onto the second tubular connection element.