Sea Technology

JUL 2017

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 13 of 68 July 2017 / st 13 environment in which to carry out these kinds of tests," he said. BorWin3 Trelleborg is also delivering a number of unique solu- tions for HVDC BorWin3, a high-voltage link that will al- low power generated by wind turbines in the North Sea to be transmitted to the German mainland. Due to commence operation in 2019, BorWin3 is the third in a series of such links, with each named after the nearby island of Borkum. BorWin3 is significant in that its converter platform is being constructed using "floatover" technology. This is only the third time that this approach, common in the oil and gas industry, is being used on a wind farm project. The converter platform consists of a six-legged base (or jacket) and a separate topside. The base will first be secured in place, and then the topside will be transported by barge to the site and lowered on top of it. Six deck support units will sit between the topside and the deck support frame on the barge used to take the topside to site and absorb impact loads as the topside is mated to the jacket. In addition, six leg mating units (LMUs) will be supplied to reduce impact forces during the mating operation, allow- ing topside movement to be progressively reduced to zero during load transfer. While LMUs are generally welded to the topside prior to the transport operation, the BorWin3 project calls for the external tubular cans to serve as individ- ual supports during the construction phase. This installation will entail immersion in seawater, so Trelleborg creatively proposed that the LMU be delivered in two stages: first the tubular cans and then the internal components. While this satisfied the customer, it created another chal- lenge as the internal components of the leg mating unit are usually bolted and welded to the tubular can prior to its being welded to the topside. Because the cans are being fit- ted to the topside in advance, Trelleborg engineers devised a unique clip system that allows the internal components to be easily fitted once the topside is complete. As well as allowing the BorWin3 project to proceed, the solution has potential for other applications, and there are now plans to use it on other Trelleborg renewable projects. Conclusion Renewable energy has a massive future and could help establish a different culture, different manufacturing meth- ods and a different outlook for the world. Trelleborg is at the forefront of technical evolution that provides the innovative solutions needed to meet the world's growing demand for energy and is committed to supporting the renewables in- dustry. The offshore wind industry can gain insight from the off- shore oil industry through transferrable, proven technologies and experience from offshore applications; a high standard of safety and compliance levels for product design, manu- facture and installation; constant innovation; and working shoulder-to-shoulder with customers' engineers to design the best solution. ST John Deasey is the renewables manager for Trelleborg Offshore (www.trelle He has more than five years of experience in the renew- ables industry. He specializes in wind, wave and tidal opportunities in this grow- ing sector, working on many projects, including floating wind turbines in Europe and the Far East. All-in-one acoustic tracking, navigation and communications for small AUVs Small AUVs need small instruments and they don't get much smaller than our new AvTrak 6 Nano OEM. It measures just 88mm long and 56mm wide yet we've managed to combine USBL tracking, support for LBL and bi- directional communications in one easy-to-fit, easy-to-integrate design. A li-ion battery gives you 10 days standby life to help recover your vehicle if lost and it's compatible with all the Sonardyne 6G systems fitted to ships and unmanned systems in use across the oceans. Enhance the mission capabilities of your marine robotic platforms. Search AvTrak 6 Nano OEM WHY NOT CUT IT OUT AND TRY IT FOR SIZE? Autonomy

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