Abstract: A wireline tensioner includes at least one sheave, a first accumulator unit, a second accumulator unit, a hydraulic distribution system, and a hydraulic cylinder unit which is operatively connected to the at least one sheave, to the first accumulator unit and to the second accumulator unit via the hydraulic distribution system. The first accumulator unit receives hydraulic fluid from the hydraulic distribution system at a first hydraulic pressure. The second accumulator unit receives the hydraulic fluid from the hydraulic distribution system at a second hydraulic pressure. The first hydraulic pressure is lower than the second hydraulic pressure.

Abstract: A compensating cylinder unit for compensating relative movements between a stationary frame and a compensated frame which includes parts of a coiled tubing compensation system. The compensating cylinder unit includes a fluid reservoir configured to connect to the stationary frame, and a compensating cylinder configured to connect to the compensated frame, to at least partly enclose the fluid reservoir, and to be in a fluid communication with the fluid reservoir to allow for an axial displacement of the compensating cylinder relative to the fluid reservoir.

Abstract: A hydraulic cylinder unit for connection to a wire line riser tensioner system includes a hydraulic cylinder comprising a cylinder piston separating a first cylinder chamber from a second cylinder chamber. A low pressure tank is arranged as a closed cylinder. A first conduit is inserted into the closed cylinder and provides a fluid communication between the low pressure tank and the first cylinder chamber. A second conduit provides a fluid communication between a high pressure fluid reservoir and the second cylinder chamber. A feedback conduit provides a fluid communication between the first cylinder chamber and the second cylinder chamber. A valve element comprising at least one valve is configured to be in a fluid communication with the at least one first conduit and the at least one feedback conduit. The valve element is configured to provide a reversible switching between a first alternative configuration and a second alternative configuration.

Abstract: A hydraulic cylinder unit for connection to a wire line riser tensioner system includes a hydraulic cylinder comprising a cylinder piston separating a first cylinder chamber from a second cylinder chamber. A low pressure tank is arranged as a closed cylinder. A first conduit is inserted into the closed cylinder and provides a fluid communication between the low pressure tank and the first cylinder chamber. A second conduit provides a fluid communication between a high pressure fluid reservoir and the second cylinder chamber. A feedback conduit provides a fluid communication between the first cylinder chamber and the second cylinder chamber. A valve element comprising at least one valve is configured to be in a fluid communication with the at least one first conduit and the at least one feedback conduit. The valve element is configured to provide a reversible switching between a first alternative configuration and a second alternative configuration.

Abstract: A motion compensation system is provided for controlling relative movements between a floating vessel and an elongate element, where the elongate element is suspended by the vessel at a first end and extends into a body of water below the floating vessel. An active motion compensator is connected to the elongate element first end via an element arranged in an upper region of an erect support structure and a passive motion compensator is connected to the elongate element first end via the element. The motion compensators are structurally and operationally separate and independent units and are configured for separate and mutually independent operation.

Abstract: A motion compensation system is provided for controlling relative movements between a floating vessel and an elongate element, where the elongate element is suspended by the vessel at a first end and extends into a body of water below the floating vessel. An active motion compensator is connected to the elongate element first end via an element arranged in an upper region of an erect support structure and a passive motion compensator is connected to the elongate element first end via the element. The motion compensators are structurally and operationally separate and independent units and are configured for separate and mutually independent operation.

Abstract: A seafastening apparatus includes a movable frame having an opening configured for receiving and at least partially supporting an equipment unit. A locking device is configured for selective locking and releasing of the equipment unit and hence controlling lateral movements of the equipment unit relative to the apparatus. The locking device includes wires configured for connection to the equipment unit and tensioners configured for controlling the tension in each wire, and a pair of extendible and retractable arms are configured for conveying and guiding at least on of the wires.

Abstract: An apparatus for controlling movements of a free-hanging tubular suspended via at least a connector element by at least one compensator member connected to a buoyant vessel, the tubular extending into a body of water below the vessel. The apparatus includes a motion sensing device configured to sense movements of the compensator member and thus that of the vessel, and a position indicator device configured to sense the position of the connector element, and thus that of an upper region of the tubular, with respect to the compensator member. The apparatus further includes a data processor configured to determine one or more parameters regarding the movement between the vessel and the upper region of the tubular; and an adjusting device configured to control at least the stiffness and dampening of the compensator member; whereby the axial loads which are transferred between the compensator and the tubular may be controlled.