Page 43: of Offshore Engineer Magazine (Mar/Apr 2019)

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the acquisition of Bohlen Doyen, and a trencher capable of burying cables down to 8 meters depth.

More broadly, Jack Spaan says the market conditions have

To date, most offshore wind turbines have been meant older vessels have been made redundant and reorga- installed using jack-up vessels, due to the need nization has been needed in the industry. “For Boskalis, we for vessel stability during installation. However, have had a combination of new vessels, procurement of ves-

Van Oord has been proving the potential to sels, discarding vessels or possible life extension,” he says. carry out this work from a jack-up vessel in

One of Boskalis’ moves was to convert a former heavy ? oating mode, a methodology that could save transport vessel into a heavy lift vessel, by adding a time. On the Walney Extension offshore wind 3,000-metric-ton Huisman crane and dynamic positioning farm, Van Oord deployed both heavy lift instal- capability. The 220-meter-long, 43-meter-wide Bokalift 1, lation vessel Svanen and offshore installation which entered the market in 2018, is the result. “Before the vessel Aeolus. “The 8,000-metric-ton [capacity] conversion, Boskalis had to hire in external crane capacity,”

Svanen installed the 56 monopile foundations. says Spaan. “The Bokalift 1 is able to transport, lift and in-

The other 31 monopiles, as well as the transition stall platforms and offshore wind turbine foundations.” Bos- pieces, were installed by offshore installation kalis is studying the potential for a second crane vessel and vessel Aeolus,” says Kevin van de Leur, lead has added a construction support vessel to its