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The company developed crane vessels to lift large offshore platforms and modules. 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.
There are specific methods, pieces of equipment, and safety protocol for many different types of loads. Offshore, on rigs or vessels, most equipment and materials will arrive on location, transferred by boat utilising a crane, therefore banksmen play an important role in the marine and offshore industries. [2]
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.
Montco Offshore's MiNO Marine, LLC–designed L/B Robert has a working water depth of 270 feet (82 m), 15,400 square feet (1,430 m 2) of deck area and a 500-ton crane.The legs are 335 feet long (102 m) and it has a main crane and three auxiliary cranes.
Equipped with a large 7,500 tonnes lifting capacity crane, an additional 4,000 tonnes crane and an auxiliary 1,600 tonnes hook, a long stinger [12] and extensive equipment for lifting and lowering exceptionally heavy equipment and oil rigs, Lanjing is the largest crane vessel in the world (as of 2019). [13]
The Saipem 7000, originally named the Micoperi 7000, was conceived in the mid-1980s by its original owners Micoperi as a multipurpose offshore oil platform installation vessel that would be able to install very large oil production platform decks (known as integrated decks) as well as the decks' supporting structures (known as jackets) using its two very large fully revolving cranes.
The auxiliary crane is capable of lifting (or lowering) 70 t (77 short tons) at a radius up to 12 m (39 ft) down to 2,000 m (6,600 ft) below the waterline; capacity reduces to 25 t (28 short tons) at 60 m (200 ft) radius and 8 t (8.8 short tons) at 72 m (236 ft) radius. [7] Huisman provided the auxiliary crane as well. [13]
The crane operator either sits in a cab at the top of the tower or controls the crane by radio remote control from the ground. In the first case the operator's cab is most usually located at the top of the tower attached to the turntable, but can be mounted on the jib, or partway down the tower.
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