DEME group’s new installation/decommissioning vessel will be the first of its kind to be fuelled by environmentally friendly liquefied natural gas (LNG)
DEME, whose subsidiary GeoSea has become a well known provider of installation services in the offshore wind industry, is one of a number of companies to have ordered a construction vessel capable of decommissioning and installing offshore structures.
The company’s new vessel, Orion, is being built at COSCO in China for delivery in 2019. Although primarily intended as an installation vessel for the offshore wind industry, it will also be able to undertake decommissioning projects in the offshore oil and gas sector.
With a total installed power of 44,180 kW, Orion will be equipped with a high-capacity crane with lifting capacity of 5,000 tonnes at 35m. The crane will be able to lift loads to a height of more than 170 m. Deck space on the vessel has been maximised to provide exceptionally high transport and loading capacity. At 216.5 m long, Orion will be a dynamic positioning class 3 vessel with accommodation for 131 people.
“The vessel can take the heaviest monopiles, jackets, wind turbine components and structures in a single shipment,” said DEME. “With this unmatched combination of high load and lifting capacity, Orion can transport and install the next generation of multi-megawatt wind turbines.”
Environmental considerations have also been an important element in the design of the vessel. Orion has dual-fuel engines and can run on conventional fuel or LNG. The vessel will have a Green Passport and clean design notation. It will also have other environmental innovations on board, such as a waste heat recovery system that converts heat from the exhaust gases and cooling water to electrical energy.
GeoSea managing director Luc Vandenbulcke said “With Orion, we will be uniquely positioned to meet the future requirements of our customers and the trend towards larger capacity turbines and bigger windfarm projects, delivering energy at lower costs. Orion will be capable of installing mega monopiles in greater water depths. With DP3 technology, the installation vessel can continue operations under the most challenging conditions.”
Offshore crane manufacturer Liebherr is to supply the crane for the installation/decommissioning vessel. It will be the largest crane developed by Liebherr to date. It will be built at Liebherr’s plant in Rostock, Germany. Delivery will be spring 2019.
“It is a great honour to work with DEME and COSCO on such a revolutionary project,” said Liebherr Offshore Cranes sales director Gordon Clark. “We see a promising future in the heavy-lift sector, with growth in both the green energy sector and offshore decommissioning.”
“The extension of our heavy crane range allows us to compete in a sector with only a few players where there has been little competition of late, and we look forward to winning some of that market share,” said Liebherr Maritime Cranes managing director Leopold Berthold.
Apart from the main crane, the deal also includes two of Liebherr’s RL-K 4200 knuckleboom cranes and an offshore crane simulator.
Wärtsilä is to supply engines and other propulsion machinery for the newbuild. In addition to the dual-fuel engines, Wärtsilä will also provide its LNGPac fuel storage and supply system and propulsion systems.
“The decision to utilise clean-burning LNG fuel is based on our commitment to provide environmentally sustainable solutions for our operations,” said Jan Gabriel, head of the newbuilding and conversion department at DEME.
The vessel will be powered by four 9-cylinder Wärtsilä 46DF dual-fuel electric propulsion engines and two 6-cylinder Wärtsilä 20DF dual-fuel engines.
Wärtsilä will also supply two custom-made retractable thrusters, four underwater demountable thrusters and the Wärtsilä LNGPac storage and supply system and is also responsible for commissioning, site supervision and project management services.
The equipment is due for delivery to the yard building Orion in the latter part of 2017.