A method and heave compensator for eliminating snap-load and heave effects at offshore deposition of a load into or onto the sea or seabed involves a heave compensator suspended between the load and the lifting device having a relatively stiff stroke response at small to moderate stroke lengths and then a softer stroke response at larger stroke lengths to avoid exceeding the dynamical amplification factor (DAF)-limitations of the crane/lifting device or on the load.

Ernst-B. Johansen AS

Heave compensator and method for reducing the risk of snap-loads during the splash-zone phase

Method for maneuvering a buoyant body of a wave power converter having a mechanical-electric, mechanical-hydraulic or piezo-electric energy converter which is arranged in the sea under the buoyant body, the buoyant body and wave power converter being connected by a wire, and which buoyant body is provided with at least one ballast tank for controlling the buoyancy of the buoyant body, where the method includes, by means of measuring equipment acquiring information regarding wire tension, filling level/pressure in the ballast tank and stroke of the energy converter, and controlling the buoyancy of the buoyant body by supplying/discharging water/air to/from the ballast tank while at the same time adjusting the tension of the wire by operating a winch arranged in the buoyant body. The invention also relates to a wave power plant for executing the method.

sea/insultas

Heave compensator and method for reducing the risk of snap-loads during the splash-zone phase

Method for operating a buoyant body of a wave power plant and a wave power plant

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