Page 62: of Maritime Reporter Magazine (November 2019)

OFFSHORE WIND THE INSTALLATION FLEET 14-meter leg extensions to manage off- transport of higher and heavier turbine Delft Offshore Wind Turbine Concept tion between research partners TU Delft, shore sites with deeper water and higher components. (or DOT), in just one hour, using the ? rst TNO, Van Oord and Sif group, and proj- survival storms, such as the North Sea We also asked Seaway 7 (formerly slip joint connection concept in the in- ect stakeholders Eneco and Heerema basin. Moreover, the cranes’ booms have Seaway Heavy Lifting) and DEME dustry. Marine Contractors in 2016. The concept been upgraded with a 20-meter boom Group for their views, but neither com- The DOT wind turbine had already is based on friction, where the weight en- insert, enabling them to install turbines pany responded. been installed on a monopile connected sures a ? rm and stable connection. This with a higher hub height. Both Brave by the slip joint and was picked up in a means that installation is done by simply

Tern and Bold Tern have replaced the Potential for disruption? single lift by the Aegir from Sif Rotter- sliding the wind turbine over the mono- deck crane to enable lifting of tools and Others are looking for alternative en- dam’s quayside and taken to the instal- pile without the use of grout or bolts, re- equipment to the transition piece, for gineering methodologies to make off- lation site, the Eneco Princess Amalia ducing costs, materials, equipment, per- faster and more ef? cient installations. shore installation easier. Last Septem- Wind Park. There, it was installed by the sonnel and schedule, says HMC.

In addition, the vessels have undergone ber, Heerema Marine Contractor’s Aegir Aegir as a ? oating vessel using dynamic Meanwhile, Spanish ? rm Esteyco is under-deck modi? cations and strength- heavy lift vessel (launched as a kind of positioning. leading the ELICAN consortium which ening, as well as modi? cations to the ‘Swiss army knife’ for the oil industry The slip joint connection was designed has designed and installed a 5MW pro- tank arrangement to enhance the proba- during its boom in 2013) installed a new under the Slip Joint Offshore Research totype Elisa self-installing telescopic bilistic damage stability; both to enable design wind turbine concept, called the project (SJOR), launched by a collabora- tower concept that would reduce need

The new Siemens

Gamesa 10MW offshore wind turbine, artist’s impression.

Source: Siemens Gamesa 62 Maritime Reporter & Engineering News • NOVEMBER 2019

MR #11 (59-65).indd 62 10/29/2019 11:39:14 AM