Abstract: The method according to the invention comprises providing a flexible line (18) and a bend limiter axially immobilized around the flexible line (18) by a releasable immobilizing mechanism (46). It includes partially inserting the flexible line (18) through a hollow rigid member (40), immobilizing the bend limiter on the hollow rigid member (40), and deactivating the releasable immobilizing mechanism (46). The releasable immobilizing mechanism (46) is deactivated independently of the movement of the flexible line (18) relative to the bend limiter.

Abstract: A connection assembly allowing a pipe (12) extending from the seabed (14) to be connected to a flexible pipe (26) leading to the sea surface (22). The assembly includes a turret (32) having an upper end (42) connected to a float (20) and a lower end (40) connected to the pipe (12). The turret (32) has a duct (50) extending towards the upper end (42) and having a free end (66) provided with an end fitting (68). The turret includes retaining members (70, 72, 74, 76) that keep the connector (30) between the turret and the end fitting, facing the end fitting (68). The connector (30) is in a fixed position in relation to the retaining members (70, 72, 74, 76) and a drive device (112) drives the end fitting (68) toward the connector (30).

Abstract: The method according to the invention comprises providing a flexible line (18) and a bend limiter axially immobilized around the flexible line (18) by a releasable immobilizing mechanism (46). It includes partially inserting the flexible line (18) through a hollow rigid member (40), immobilizing the bend limiter on the hollow rigid member (40), and deactivating the releasable immobilizing mechanism (46). The releasable immobilizing mechanism (46) is deactivated independently of the movement of the flexible line (18) relative to the bend limiter.

Abstract: The device of the present disclosure comprises a holder (80) fixed to the first element and a connection element (82) borne by the holder (80). The connection element (82) is intended to engage on the second element (24). It is mounted with radial mobility in relation to the holder (80) between a separated placement configuration and a contracted configuration for holding the connection elements (82) on the second element (24). The or each connection element (82) comprises a self-locking system (100) and a mobile catching member (102), the catching member (102) being mounted with the ability to move in the self-locking system (100). The fixing device (22) comprises an actuator (104) for moving the catching member (102) in the self-locking system (100) between a deployed position and a position in which it is retracted in the self-locking system (100).

Abstract: A device includes a hollow rigid member (40) and a curvature limiter (42) movable relative to the hollow rigid member (40). A releasable device (46) for axial immobilization of the curvature limiter (42) on the flexible line (18) in at least one first direction along a travel axis (X-X?). The axial immobilization device (46) includes a locking member (90) axially secured to the flexible line (18), and a member (92) for fitting the locking member (90), axially secured to the curvature limiter (42). Those members (90, 92) are movable relative to each other around the travel axis (X-X?) between a configuration for axial immobilization of the flexible line (18) on the curvature limiter (42), and a configuration for axial travel of the flexible line (18) across the curvature limiter (42).

Abstract: A method and a device for measuring the movement of a subsea pipeline. The measuring device has an accommodating mount anchored in the sea bed to accept the subsea pipeline. The subsea pipeline is liable to be made to move over a determined travel with respect to the accommodating support as the pipelines deforms. The movement has an amplitude that varies according to the deformation of the subsea pipeline. A plurality of frangible elements secured to one of either the deformable subsea pipeline and the accommodating mount. The frangible elements are intended to be broken in succession by the other of either the deformable subsea pipeline and the accommodating mount when the pipeline is caused to move.

Abstract: For regulating the lateral buckling of a section of pipe, at least one device permanently applies a force to a point on the section of pipe. The force is preferably applied substantially horizontally and perpendicular to the axis of the pipe. Preferably, two of the devices that apply equal and opposing forces are positioned at a distance from each other along the section of a pipe. Each device comprises a clamp, a cable, a return device and a buoy or a weight.

Abstract: A device includes a hollow rigid member (40) and a curvature limiter (42) movable relative to the hollow rigid member (40). A releasable device (46) for axial immobilization of the curvature limiter (42) on the flexible line (18) in at least one first direction along a travel axis (X-X?). The axial immobilization device (46) includes a locking member (90) axially secured to the flexible line (18), and a member (92) for fitting the locking member (90), axially secured to the curvature limiter (42). Those members (90, 92) are movable relative to each other around the travel axis (X-X?) between a configuration for axial immobilization of the flexible line (18) on the curvature limiter (42), and a configuration for axial travel of the flexible line (18) across the curvature limiter (42).

Abstract: A method and a device for measuring the movement of a subsea pipeline. The measuring device has an accommodating mount anchored in the sea bed to accept the subsea pipeline. The subsea pipeline is liable to be made to move over a determined travel with respect to the accommodating support as the pipelines deforms. The movement has an amplitude that varies according to the deformation of the subsea pipeline. A plurality of frangible elements secured to one of either the deformable subsea pipeline and the accommodating mount. The frangible elements are intended to be broken in succession by the other of either the deformable subsea pipeline and the accommodating mount when the pipeline is caused to move.

Abstract: An assembly of support buoys for a flexible submarine pipeline which is designed for the transport of hydrocarbons. A plurality of buoys which can be installed gradually on at least one portion of the flexible submarine pipeline. A fixing device blocks translational movement of the buoys on the portion of the pipeline. The fixing device includes a hitching or coupling line which connects each of the buoys successively to one another. The translational movement of each of the buoys is gradually blocked on the coupling line. Connecting devices maintain the coupling line taut at locations along the portion of the pipeline.

Abstract: The invention concerns an assembly for installation of an underwater structure on the sea floor, said sea floor being covered with particles capable of being driven in suspension in the water above said sea floor, the mounting of said underwater installation capable of being implemented by an underwater robot driven by propulsion means, said propulsion means being capable of displacing the sea floor water and said suspended particles around said installation; said assembly comprising means (22, 26) for covering said sea floor surrounding said installation with a protective blanket (10) adapted to confine said particles on said sea floor.

Abstract: A method and a device for installing a sub-sea riser for an offshore operation, between a base installation disposed on the sea bed and a sea installation protruding above the base installation. The sub-sea riser is provided with a first end and a second end. The method comprises the following stages in the following order: a) the first end of the riser is joined to the sea installation; b) the sub-sea riser is deployed; c) the second end of the riser is guided towards the base installation; d) the second end is coupled to the base installation by releasing the second end and the efforts of the recoil force exerted on the base installation are transferred; e) the second end and the base installation are connected to each other.

Abstract: An assembly of support buoys for a flexible submarine pipeline which is designed for the transport of hydrocarbons. A plurality of buoys which can be installed gradually on at least one portion of the flexible submarine pipeline. A fixing device blocks translational movement of the buoys on the portion of the pipeline. The fixing device includes a hitching or coupling line which connects each of the buoys successively to one another. The translational movement of each of the buoys is gradually blocked on the coupling line. Connecting devices maintain the coupling line taut at locations along the portion of the pipeline.

Abstract: For regulating the lateral buckling of a section of pipe, at least one device permanently applies a force to a point on the section of pipe. The force is preferably applied substantially horizontally and perpendicular to the axis of the pipe. Preferably, two of the devices that apply equal and opposing forces are positioned at a distance from each other along the section of a pipe. Each device comprises a clamp, a cable, a return device and a buoy or a weight.

Abstract: The invention concerns an assembly for installation of an underwater structure on the sea floor, said sea floor being covered with particles capable of being driven in suspension in the water above said sea floor, the mounting of said underwater installation capable of being implemented by an underwater robot driven by propulsion means, said propulsion means being capable of displacing the sea floor water and said suspended particles around said installation; said assembly comprising means (22, 26) for covering said sea floor surrounding said installation with a protective blanket (10) adapted to confine said particles on said sea floor.

Abstract: A method and a device for installing a sub-sea riser for an offshore operation, between a base installation disposed on the sea bed and a sea installation protruding above the base installation. The sub-sea riser is provided with a first end and a second end. The method comprises the following stages in the following order: a) the first end of the riser is joined to the sea installation; b) the sub-sea riser is deployed; c) the second end of the riser is guided towards the base installation; d) the second end is coupled to the base installation by releasing the second end and the efforts of the recoil force exerted on the base installation are transferred; e) the second end and the base installation are connected to each other.