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SSCV Thialf is a huge semi-submersible crane vessel operated by the Netherlands-based Heerema Marine Contractors; it was the largest crane vessel in the world until the SSCV Sleipnir became the largest in 2019.
In 1978, HMC commissioned Mitsui to construct the two sister semi-submersible crane vessels, DCV Balder and SSCV Hermod. These vessels could lift 5,400 tonnes with the twin cranes, and were later upgraded to 8,200 tonnes. [2] In 1988 HMC formed a joint venture with McDermott called HeereMac. [3] "Thialf" in a Norway fjord
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.
Operated by Shell, with JV partners Chevron (37.5%) and BP (27.5%), the spar acts as a hub for and enables development of three fields Great White, Tobago, and Silvertip. The oil and gas fields beneath the platform lie in a geological formation holding resources estimated at 3–15 billion barrels of oil equivalent according to a report by the BSEE, formerly known as the MMS.
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The Base Tower makes up the first 250 metres of the more than 400 metre high tower. The crane vessel that is partly visible is the Thialf. This is the heaviest compliant tower installed to date and the first outside of the Gulf of Mexico.
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Unlike a submersible, a semi-submersible vessel is not supported by resting on the seabed. Semi-submersible vessels are able to transform from a deep to a shallow draft by deballasting (removing ballast water from the hull), thereby becoming surface vessels. Usually they are moved from location to location in this configuration.