![]() The main hoist, in a reduced reeving, can lift 1,000mt to 1,000m water depth and is fitted with active heave compensation. The cranes further feature a 2,500mt aux hoist and a whip hoist with a maximum reach of 155m. 3 Conversion to a DCV was carried out in 2001. 2 In the early 1980s these vessels set several lift records while operating in the North Sea. Balder and sister vessel, Hermod were the world's first semi-submersible crane vessels. The vessel has unique capabilities to work at water depths from 70 feet and beyond, and the cranes provide for a depth reach lowering capability as well as a. The slew bearings of these cranes have a diameter of 30m. The Balder was constructed in 1978 as semi-submersible crane vessel by Mitsui Engineering & Shipbuilding Co., Ltd. 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. This crossing is the first time a Heerema crane vessel has accessed the region and is the result of innovative crane alterations that enable passage below the bridge. It is named for Sleipnir, the eight-legged horse ridden by Odin in Norse mythology. Heerema Marine Contractors’ semi-submersible crane vessel Thialf has crossed the Storebaelt Bridge, known as the gate to the Baltic Sea. Especially on semisubmersibles this is an important feature. SSCV Sleipnir is a semi-submersible crane vessel (SSCV) owned and operated by Heerema Marine Contractors. Another large benefit of using a bearing is a very significant weight saving. ![]() ![]() The use of bearings on the 2x10,000mt Heerema cranes instead of the traditional slew systems allows for very accurate control of the slewing motion of the crane and requires very little maintenance. This technique represents a step change in the crane industry, and was previously used successfully on the 5,000mt Offshore Mast Crane for the ‘Seven Borealis’ and the 4,000mt Offshore Mast Crane for Heerema’s ‘Aegir”. These decommissioning activities will be carried out by Heerema Marine Contractors’ second largest semi-submersible crane vessel (SSCV), Thialf. Unlike traditional Tub Cranes which make use of either bogies or large wheels for their slew system, the Huisman cranes make use of large bearings of own design which are manufactured in-house. Ireland-based PSE Kinsale Energy, a Petronas subsidiary, is preparing to kick off its platform removal campaign for the Kinsale Head gas field, located in the Celtic Sea, in late May. The two cranes are able to lift 10,000mt at 48m radius in offshore conditions. The new build 2x 10,000mt TMC Cranes are the world’s largest Tub Cranes. Huisman developed 2x 10,000mt Tub Mounted Cranes for Heerema’s Sleipnir, a semi-submersible crane vessel.
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