The large port and starboard cranes were fabricated at Huisman's factory in Xiamen, China, and shipped in pieces to Singapore the BigRoll RoRo ships Baffin (now BigLift Baffin) and Beaufort were used to ferry the crane houses, luffing frames, winch frames and booms along with other large pieces in 2018. Įach luffing frame weighs 1,170 t (1,290 short tons), and each boom weighs 1,465 t (1,615 short tons). The crane house is secured to the foundation using 1,100 bolts 82 mm (3.2 in) in diameter, held in place by nuts weighing more than 40 kg (88 lb). Prior to the cranes for Sleipnir, the largest bearings Huisman had used for tub-mounted cranes were only 12 m (39 ft) in diameter. Conventional tub-mounted cranes ride on bogies or wheels, while the Huisman 10,000t cranes use the bearing directly. The slewing system, which allows the cranes to rotate in their tub, uses the world's largest bearings at 30 m (98 ft) in diameter. The two large port and starboard tub-mounted cranes are provided by Huisman overall boom length is 144 m (472 ft). Cranes Sleipnir outside Aibel in Haugesund, Norway Each column is 23.75 m (77.9 ft) tall and has a staircase connecting the deck with the pontoon below. The ship's ballast tanks and LNG storage are contained within the eight columns. The columns are rounded to reduce wave interactions, and the pontoons are streamlined to reduce drag. Typical SSCVs use larger columns under the cranes to provide support, which can lead to severe pitching in rough seas SSCV Sleipnir uses columns that are symmetrical fore and aft for calmer motions under higher sea states. The vessel is essentially a large platform supported by eight columns (four on each side), with one pontoon per side. After its completion in 2019, SSCV Sleipnir succeeded Heerema's earlier SSCV Thialf as the largest crane vessel in the world.
It was ordered in 2015 and built in Singapore by Sembcorp Marine. 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). It is named for Sleipnir, the eight-legged horse ridden by Odin in Norse mythology. SSCV Sleipnir is a semi-submersible crane vessel (SSCV) owned and operated by Heerema Marine Contractors. The 'Alfa Lift' was one of the nominees for the Offshore Renewables Award 2020.12 × 8 MW dual-fuel engines ( MGO or LNG) Ĩ Wärtsilä azimuth thrusters (4 forward, 4 aft), 5.5 MW each
#Semi submersible crane vessel install
Once delivered, OHT 'Alfa Lift' will install the monopile foundations for Equinor's Dogger Bank project, the largest offshore windfarm in the world. We look forward to delivery of the vessel and trust it will bring highly-efficient service to the end client in the near future'. Designed as an efficient vessel with one-stop service for both transportation and installation, Alfa Lift will surely become the favourite of the market for offshore wind installation vessels in the coming years. Mei Xianzhi, General Manager of CMHI added 'The achievement of this important milestone could not be separated from the close teamwork between OHT and CMHI. We have no doubt that Alfa Lift will be a very busy vessel for many years to come'. Torgeir Ramstad, CEO of OHT added ' This is an important milestone that brings Alfa Lift one step closer to entering service and helping to satisfy the ever-growing global demand for custom-built offshore wind installation vessels. The heavy lift crane's slewing column and the A-frame are scheduled to leave Rostock in early March and will arrive in China in April where they will be installed.
Meanwhile, key elements of Alfa Lift's major crane components have been completed in Rostock, Germany. She has been developed for the installation of the next generation big sized offshore wind foundations.Īccording to an OHT update, the vessel will now be moored whilst work continues on the steel and internal fit-out, including the mechanical completion of systems. Based on Ulstein's Alfa Lift concept, this vessel is recognized as the most innovative offshore wind foundation installation vessel in the world and regarded as a game changer to the industry. This semi-submersible offshore wind foundation installation vessel has been designed and developed by Ulstein Design & Solutions BV for Offshore Heavy Transport (OHT).
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