NEWS Ӏ JUNE 2021
170M TuRBINES INSTALLATIoN
Dutch crane contractor M. Verschoor recently used its new Liebherr LG 1750 with SX3 lattice boom system to erect two Vestas wind turbines in North East Germany. Liebherr says the SX3 version
delivers 20% higher lifting capacity and higher wind tolerance compared to the conventional SX version. The turbines, with 170m hub heights, comprised heavy tower components. “The first four tower sections each weighed 120t, which, when combined with the hook block, meant a load case of around 123t. With a radius of 35m, that meant that we use the full lifting capacity of the crane for this job,” said crane operator Johan Bezemer. “This crane with its SX3 boom enables us to increase our capacities, so that we can also erect these very large turbines. Its 165m main boom and 12m jib gives us a lifting capacity of 127t.” With the SX3 boom system, the lower section of the lattice boom has been extended to a width of 6m. Liebherr says the 28m or 42m boom reinforcement delivers greater rigidity in the boom
design, reducing crane downtime due to wind. “The earlier systems used on the LG 1750 were calculated on the basis of a maximum wind speed of 9m per second,” said Jens Könneker, product manager for crawler cranes at Liebherr- Wek Ehingen. “The SX system now allows work to continue in wind speeds of up to ten, or in some cases even 11.2m per second.” Bezemer said three working days were saved because of the greater wind tolerance of the SX3 boom system.
After all the tower segments had been assembled, the lattice jib had to be extended to 15m using an intermediate section, so that the crane could provide the hoist height required for the other components, including the 100t gondola. The time required to lower the massive lattice boom was reduced because of the VarioTray detachable ballast pallet. The 415t of suspended ballast were only required to raise or lower the boom. The centre section of the counterweight was all that was required for the actual hoisting work.
WAvE ENERGY pRoToTYpE LIFTED
A custom-made 50 WLL lifting frame designed by Modulift was used for Mocean Energy’s new Blue X wave energy prototype first ever dip in the cold waters of the North Sea. Mocean Energy has
been working on turning their concept into a reality for the past three and half years. The 20m long, 38t wave machine Blue X is a prototype design. Blue X has now
undergone it’s first wet testing, load tests and ballast testing at Rosyth, Scotland, with the help of Modulift. The Blue X has
been recently transported to Orkney to undergo more testing at the European
Marine Energy Centre. Cameron McNatt, managing director and co-founder of Mocean Energy, said: “Lifting is a critical operation for Blue X – the device is lifted on and off of transport, into and out of the water sometime over steep quaysides. And it is complex – Blue X is a hinged machine that can be lifted in two configurations. Modulift provided a fit-for-purpose solution and delivered not just the lift beam but also the rigging and helped in the design process.”
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