Netherlands-based heavy-lift specialist OOS International is aiming high with its semi-submersible crane vessel OOS Zeelandia, which will be the largest vessel of its type in the world upon completion
The semi-submersible crane vessel OOS Zeelandia is being built to carry out platform removal and installation operations in deep water and will be 225 m long, with a beam of 117 m, a molded depth of 16.50 m, a main deck height of 50.25 m and a deck box height of 15.75 m. It will have a transit draught of 11.50 m, an operating draught of 26 m and a heavy-lift draught of 28 m.
OOS Zeelandia will have a hefty cargo capacity, too. Clear deck space will measure 11,000 m2 with a load capacity of 15 tonnes per m2 and a variable deck load of 20,000 tonnes. It will have capacity for 9,500 tonnes of marine diesel oil (MDO) and 6,000 m3 of LNG for fuel, 1,200 tonnes of potable water and 60 tonnes of lubricating oil, allowing for extended periods of autonomous operation.
The self-propelled vessel will have a speed of 15.6 knots and will be powered by 12 7,100 kW dual-fuel engines, running on LNG and MDO. Propulsion will come in the form of five 5,800 kW stern thrusters, three 6,500 kW forward retractable thrusters and four 2,500 kW tunnel thrusters, with steering capacity from the stern azimuth thrusters. The vessel has a dynamic positioning (DP) rating of DP3.
Up to 500 people can be accommodated aboard, in 250 one-person daylight cabins and 125 two-person cabins. The hotel capacity will be integrated into the deck box, freeing up deck space. In case of emergency, there will be eight 125-person and one 70-person freefall lifeboats, along with life rafts with capacity for up to 500 people.
Main lifting capacity will take the form of two 12,500-tonne main deck cranes with a lifting height of 45 m, offering a combined lift capacity to install and remove platforms and offshore structures weighing up to 25,000 tonnes in a single lift. The aft crane will be fitted with a 360-degree rotating work bridge, upon which DP operators and crane drivers will work alongside each other. The two main cranes will be separated by 112 m. There will also be two 60-tonne provisions cranes with a lifting height of 40 m, a 46.5 m telescopic gangway, and four Smit tow brackets with a safe working load of 500 tonnes. OOS Zeelandia will be capable of undertaking construction and support work in water depths of up to 4,000 m.
ABS has been chosen as class society for OOS Zeelandia and its notations include LNG Ready, Cold Climate and an ice class of A0.
OOS revealed it had agreed a Memorandum of Understanding (MoU) with Hong Kong-headquartered China Merchants Group subsidiary China Merchants Industry Holdings at the EU-China Blue Industry Cooperation Forum on 8 December 2017 in Shenzhen. Signed in July 2017, the MoU confirms the commitment of both parties to establishing a strategic partnership for the engineering and construction phase of OOS Zeelandia. Once both companies’ boards of directors are satisfied, a firmer commitment to proceed together may be made.
Speaking at the time of the MoU, OOS International chief executive and founder Léon Overdulve said: “These immense volumes that go beyond the capacity of our current fleet will be of great value to the decommissioning and subsea installation market, based on client demands concerning the removal and installation of a high number of platforms.
“The new vessel, which will be designed with the highest safety and ecological standards, proves our dedication and persistence to provide the most significant benefits in terms of people, profit and planet to optimally serve the developing oil and gas industry.
“We strongly value sustainable relationships and found a reliable partner in China Merchants Industry Holdings, engaged and highly experienced in building offshore equipment and vessels.”