LUXEMBOURG – Jan De Nul has installed nine of the 21 jacket foundations at Taiwan Power Co.’s Changhua Phase 1 offshore wind farm.
Heerema Marine Contractors’ heavy lift vessel Aegir is installing the 1,110-metric ton (1,213-ton) jackets.
Samkang built the jackets that measure between 55 m and 62 m (180 ft and 203 ft) in overall height. Five trips are needed for the two chartered heavy transport vessels to bring all jackets from South Korea to Taiwan.
The jackets include a 7.2 m (24 ft) high transition piece with a diameter of 5.4 m (18 ft) to support the towers carrying the Hitachi 5.2-MW turbines. Each jacket comes with two davit cranes for cargo hoisting and two boat landings to enable personnel access. The jackets are equipped with specialized offshore accessories such as navigation lights, foghorns, and CCTV cameras, the company said.
The jackets are anchored to the seabed by four steel pin piles. Installation of these pin piles started in June. After installing the jackets on the pin piles, the void between these two is grouted to create a firm connection.
In addition, Jan De Nul has completed all onshore civil works needed for the connection of the offshore wind farm to the Taiwanese power grid.
For the connection of the subsea cable at the landfall with the onshore substation of Changhua County, the company constructed 13 km (8.1 mi) of duct banks in collaboration with Star Energy Corp.
Consortium partner Hitachi Ltd. continues to mobilize the turbine components to the marshalling port of Taichung, to allow preparation for offshore installation this month with Jan De Nul’s jackup vessel Taillevent.