Norskhydro Asa

Hywind As

Dagfinn Sveen

Finn Gunnar Nielsen

Steinar Wighus

Tor David Hanson

A method for coordinating a floating wind turbine installation. The wind turbine installation includes a buoyant body (), a tower () arranged over the buoyant body, a generator () mounted on the tower which is rotatable in relation to the wind direction and fitted with a wind rotor (), and an anchor line arrangement () connected to anchors or anchor points on the sea bed. Static heeling, &#x3c6;, at full wind load on the wind turbine is as low as possible, but preferably less than 8 degrees, and all eigenperiods for the installation are outside the waves' period range. The eigenperiod in pitch, T(roll, T), is preferably less than 80% of the Teigenperiod in heave. Moreover, the ratio between Tand Tis not close to 0.5 or 1.

Floating wind turbine installation

A device for connection or suspension between a detachable flexible or semi-flexible riser pipe (4) and a pipe system (14) on a fixed or floating platform or ship (15) has a rotary connection which is designed in such a way that the connection between the riser pipe (4) and the pipe system (14) is moment-free or mainly moment-free. The rotary connection may appropriately have a swivel housing (3) which, on one side, is fitted with a first tubular shaft (1) which is connected to the pipe system (14) on the platform or ship and, on the other side, is fitted with a second tubular shaft (2) which is arranged in a swivel housing at an angle of 90.degree. to the first tubular shaft (1) and which is connected to the riser pipe (4). The two shafts (1, 2) communicate with each other via a cavity in the swivel housing (3), but are closed to the surroundings at their ends.

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Dagfinn Sveen