A tether management system (TMS) for subsea operations, said system comprises: an ROV (10) connected to a towable submersible unit (20), said submersible unit (20) having one or more tow cable connections (22) for a tow cable (40) running up to a surface and a tether cable connection for a tether cable (12) running down to 5said ROV (10), and the submersible unit (20) comprises an underwater winch (26), feeding the tether cable (12) in and out according to the need of the ROV (10).Said submersible unit (20) is a towed depressor, without any thrusters, creating downward depressor force in the water, and which comprises depressor flaps (30) for adjustment of the unit's downward depressor force in the water.
Free-swimming and remote-controlled net washer (10) for a fish farm net cage, comprising a framework (12) equipped with several thrusters (14) which control the net washer (10) in the fish farming net cage, and several water nozzles (16) for cleaning a submerged net in the fish farm net cage. Said water nozzles (16) are fixed water nozzles with a mouth opening facing from a side surface (20) of the net washer (10), where an ultrasonic transducer (18) is placed adjacent to each water nozzle (16) and arranged to transmit ultrasound to a water jet coming from the mouth opening.
A01K 63/10 - Cleaning bottoms or walls of ponds or receptacles
B63B 59/08 - Cleaning devices for hulls of underwater surfaces while afloat
B08B 3/02 - Cleaning by the force of jets or sprays
B08B 3/12 - Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
A system for subsea operation is described, comprising a free swimming, submersible garage and docking station (10,10'), and also an associated free swimming ROV (50), where the garage and docking station (10,10') comprises a framework (14) arranged to function as a garage (40) or docking (40') for the free swimming ROV (50), and where the submersible garage and docking station (10,10') comprises at least equipment in the form of several thrusters (16,18) for operation in the vertical and horizontal directions, respectively, units and a steering system for positioning in the water, and also a winch (12) connected to said ROV (50) via a cable (34) for the transfer of electricity and signals. The framework (14) of the garage and docking station (10,10') is manufactured from a material with buoyancy, and where the buoyancy of the framework is determined by the weight of the equipment mounted in the framework (14), so that a neutral or approximately neutral buoyancy in the water is provided for the garage and docking station (10,10').
A chain link testing apparatus (10) for testing links (70) of chains (80) includes a sensor arrangement (60, 100) for inducing one or more eddy current resonances (350, 360) in one or more links (70) of one or more chains (80) and for performing measurements of the one or more eddy current resonances (350, 360) at a plurality of time intervals for determining a mechanical status and/or a temporal change in mechanical status of the one or more links (70). The apparatus (10) is capable of being operated in an underwater environment (20). The sensor arrangement (60) includes a magnetic circuit (210A, 210B) which is magnetically couplable to the one or more links (70) when in a closed state, and movable between the one or more links (70) when in an open state. Moreover, the magnetic circuit (210A, 210B) is implemented to include one or more elements (210A, 210B) which are operable to be actuated to encircle a portion of a given link (70) when being tested.
G01N 27/90 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
A method and a device are described for survey of an ocean floor, and also cables and the like on the ocean floor in ocean areas with strong currents, as a submersible survey platform (10) is lowered from a surface vessel with the help of a winch system (12) on the vessel to a desired distance in relation to the ocean floor. The desired fixed distance from the ocean floor is controlled in real time in relation to the topography of the ocean floor at the same time as the vessel moves forward to drive the platform (10) along a desired trajectory with the help of one or more sensors that register the distance to and possibly direction towards the ocean floor and which are connected to the winch (12) via a control system (14). At the same time, sideways movements of the platform (10) caused by currents are compensated for with the help of one or more sensors that are connected to a number of thrusters (16) on the platform (10) via said control system (12).
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