OFFSHORE AND SUBSEA LIFTING | APPLICATION REPORT
P Bold Tern at work “Satisfying though it has been to
process these recent orders, we are not surprised,” says Sarah Spivey, managing director, Modulift. “We have been aware of the potential at the super-heavy end of the market for a long time—the middle remains quiet. I don’t expect this to be our highest capacity beam for the long term. We have the engineering capability to go to 5,000t and the boundaries will continue to be pushed.” Modulift is already looking at upgrading to 3000t for an upcoming project with a client. Increasing size is affecting lifting vessels
also. Fred. Olsen Windjammer installs wind farms, and its Brave Tern and Bold Tern are purpose-built heavy-lift specialist lifting vessels designed to jack themselves off the seabed while they crane the towers and rotors into place. They also carry both towers and rotors on their decks from the loading ports to the site of installation. The Bold Tern is currently working on the world’s largest offshore windfarm, the Hornsea One off the Yorkshire coast. The project is the first to have more than 1GW of capacity; it will power more than a million homes. Its sister ship is currently in Taiwan working on the new Yunlin windfarm but is shortly to be upgraded to include in her superstructure the highest crane on the market. When the work is completed in February 2022, she will be one of the few vessels capable of installing foundations and towers of next generation wind turbines. Such turbines will have tower heights of 138m to the nacelle, and rotors reaching 220m above sea level. The Brave Tern, when raised on her four legs above the surface, will be able to reach 238m with the main hook and 256m with fly-jib. Her new and unique crane will be a 1600t LEC 65500 leg-encircling crane from
Huisman. It will be fitted around the aft port leg of the Brave Tern; the lambda-shaped boom is very stiff, giving reduced motions at the tip; the compact size of the crane in combination with its low own weight and high, 1600mt, lifting capacity make it unique and suitable for both the installation of wind turbines – which requires long boom and light weight crane design - and the installation of foundations - which need short boom and strong crane construction. The crane is fully electrically driven, giving reduced power consumption, higher reliability and a more environmentally- friendly machine. “This unique crane has been enhanced with key updates and an even more extreme boom,” says Alexandra
Koefoed, CEO, Fred. Olsen Windcarrier. “The increased outreach capacity of the new crane allows us to stow the wind turbine components in a more flexible way despite the increased crane weight, thus maintaining or exceeding the payload we carry for our clients. This is a considerable lifetime extension for the vessel, as the weight and dimensions of wind turbine components continue to increase.” For lifting engineers a life on the ocean
waves will clearly continue to offer ever- increasing opportunities. ●
SHornsea One is the world’s largest windfarm
34 | May 2021 |
www.hoistmagazine.com
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