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The ship was constructed in 1985 as DB-102 for McDermott International by Mitsui Engineering & Shipbuilding Co., Ltd. In 1997, it was taken over by Heerema Marine Contractors after discontinuation of their joint venture with McDermott, HeereMac , and renamed Thialf .
The vessel is equipped with two revolving cranes built by Huisman Equipment B.V., each with a capacity of 10,000 t (11,000 short tons); the main cranes can be operated in tandem to jointly lift 20,000 t (22,000 short tons). After its completion in 2019, SSCV Sleipnir succeeded Heerema's earlier SSCV Thialf as the largest crane vessel in the world.
A crane has a lift capacity of 5,000 metric tonnes and lowering equipment can reach a depth of 3,500 meters. The vessel is equipped with class 3 dynamic positioning system. The monohull is designed for fast transit speed and optimum motion characteristics in operation. [1] The vessel can accommodate 289 persons.
The Balder was constructed in 1978 as semi-submersible crane vessel by Mitsui Engineering & Shipbuilding Co., Ltd. Balder and sister vessel, Hermod were the world's first semi-submersible crane vessels. [2] In the early 1980s these vessels set several lift records while operating in the North Sea. [3]
The main hoist could lift 92 m (302 ft) above the work deck. The auxiliary hoists could lower to a depth of 3,000 metres (9,800 ft) below the work deck. A tandem lift using the main hoists could lift 9,000 short tons (8,200 t) at a 39 m (128 ft) radius.
The ship shaped crane vessel Challenger was equipped to lift 800 t. [2] The need for large stable crane vessels to operate in the North Sea environment lead the company to develop the first large semi-submersible crane vessels. In 1978, HMC commissioned Mitsui to construct the two sister semi-submersible crane vessels, DCV Balder and SSCV ...
Allseas Group S.A. is a Dutch offshore contractor specialising in pipelay, heavy lift and subsea construction. [2] It was founded in 1985 by owner and president Edward Heerema, employs 4,000 people and operates worldwide.
Weighing 3800 ton, it is the lightest lift operation performed by the vessel. [ 46 ] In June 2019, Pioneering Spirit also removed the Brent Bravo 25,000-tonne topside located 186 km off the coast of Scotland on the way to Norway . [ 47 ]