APPLICATION REPORT | OFFSHORE
RP Tiger’s low-headroom and ultra-low headroom combination chain blocks and trolleys.
industry. There are estimated to be around 1,300 such vessels worldwide, with around 200 more under construction. Makers of winches, hoists and other maritime or subsea lifting gear have a challenge to rise to. Let us start with static towers and the
vessels that set them in place. Jack-up barges, with legs on which they can raise themselves out of the water, are a staple here, and designing the mechanism that raises them is demanding. They need, among other things, large pinions, large gearboxes and large amounts of power,
all combined with sophisticated control systems to keep the barge level and stable, with precise positioning ability thrown in. In November, offshore lifting specialists Huisman reached an important milestone in the development of a new jacking system tailored specifically for wind turbine installation jack-up vessels. It has teamed up with its long-term supplier of gearboxes for offshore equipment, German-based O&K Antriebstechnik, part of the Bonfiglioli Group, and together they successfully completed a factory acceptance test (FAT) for the first
THERN DAVITS REMOVE POLLUTION
Danish company Desmi make pumps and environmental clean-up systems for oil spills and other pollution. Its oil-skimmers are used to recover oil in ports, rivers, lakes and from the sea. After use, the skimmers handle due to the constant movement of the sea. Safe handling during deployment and recovery requires reliable and heavy- duty lifting solutions that withstand the harsh environment at sea. The Commander series stationary davit crane from US hoist maker Thern gave the combination of portability and power to get a corrosion-resistant layer to protect from harsh environments. Desmi found that the Thern davit cranes were able to lift and lower the oil skimmers with ease, leaving their operatives to fully focus on the task at hand of cleaning up oil spills to keep a clear waterway.
Huisman Jacking Gearbox, which will be part of the system. The jacking system contains a
dedicated proprietary control system that optimises the system’s load distribution, specifically for turbine and foundation installation. Control is by Huisman’s well-known proprietary Variable Frequency Drive Control System. Two gear versions will be available – L and XL – suitable for vessels from various independent design companies and of various sizes: static pinion loads up to 800t in the Large version, or 1,000t in the Extra Large. There is potential to achieve leg preload capacities beyond 30,000t, depending on leg layout and the system’s number of layers. The FAT consists of multiple tests under
motion at O&K’s test facility in Hattingen, in North-Rhine-Westphalia. Upon delivery of the gearboxes to one of its production facilities, Huisman will continue with full- load jacking demonstration trials. The aim of all this effort is, of course, to
reduce the carbon footprint of mankind’s energy demands. It is therefore entirely appropriate that in the same month, November 2022, Huisman announced its intention to launch a sustainable impact assessment to determine the carbon footprint of its products, from design up to and including delivery. The data will be used to provide insight into how the company can further reduce the CO2 footprint of its products. The calculation method is independently verified and performed according to internationally recognised ISO standards. Huisman aims to include the sustainable impact assessment
28 | April 2023 |
www.hoistmagazine.com
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