OFFSHORE & SUBSEA | APPLICATION REPORT
Most Windfarm towers rise from the seabed. They therefore have to be placed where the anyway soon be a shortage of suitable the seabed. One method of doing so is by as ‘torpedo piles.’ They are essentially long spikes with a pointed tip that are lowered overside from an installation vessel to a embed themselves in it under their own with wire ropes using an ROV. A torpedo pile is necessarily heavy. Until
now the standard method of installing them has required two lifting and handling vessels deep water for Petrobras; they are to hold a unit (FPSO) in 1900 meters of water 150km from the Rio de Janeiro coast. Each torpedo
cranes specifically designed for the ship type; in tandem they can handle cargo items weighting up to 1,600t. “Despite extremely high crane pedestals
of more than 11 m, the overall crane height and thereby the vessel’s air draft remains at just about 38m. This makes it possible for the vessel to pass through the Kiel Canal and enter strategically important ports worldwide,” says SAL’s Sebastian Westphal. “The fully electric cranes have a battery storage system that can be used with conventional gensets in hybrid mode, or in combination with the vessel’s shore power connection for fully electric port operations. That makes them perfect for the vessel’s intelligent energy management and recovery system.” The Orca vessels will have an innovative
propulsion system: the main engines have a diesel-electric booster function. At a service speed of 15 kn, the vessels will consume significantly less than the 20 tons
44 | November 2022 |
www.hoistmagazine.com
a day of similar vessels. Alternatively, the vessels will be able to trade at a slow, ultra- efficient speed of 10 kn at 6 t/day while still being able to reach a maximum speed of 18.5 kn for urgent deliveries – if a windfarm installation vessel is waiting for an urgent component delivery, for example. The vessels are equipped with dual-fuel engines, which means that they can use methanol as an alternative fuel. If green methanol becomes available in key ports - a development that is anticipated towards the end of the decade - the ship will carbon-neutral transport. Still on the subject of lifting vessels,
MacGregor has been chosen to supply cranes for Van Oord’s new generation wind turbine installation vessel being built in China by Yantai CIMC Raffles Offshore. The 175-metre vessel has an advanced jacking system. Four giant legs, each measuring 126 meters in length, allow the vessel to be jacked up and work in waters
up to 70 meters deep. It is considered to be one of the largest such vessels in the world. The main crane lifting capacity is more than 3,000 tons. MacGregor will be supplying two auxiliary offshore telescopic cranes, which are used to support the cargo and load handling during the installation of wind turbines in the offshore environment. They are customized according to the
ship owner’s requirements, with high lifting performance and long outreach but a very compact and robust design and are equipped with an anti-collision system.
LIEBHERR If you want an illustration of the physical size of offshore wind towers, here you have one: the next generation offshore installation vessel ‘Orion’ operated by DEME of Belgium has Liebherr’s HLC (Heavy Lift Crane) 295000 installed on board; and this is actually the largest crane that Liebherr
TORPEDOES AWAY! Instead of an onboard crane lifting the
torpedo clear into the air before lowering method. It used one of its two 900-ton cranes to tilt each torpedo over the side of the vessel before winching it down to the ‘launch’ depth. The technique has been in development to previous campaigns with anchor handling
equipment ourselves. And she has a large when working in the South Atlantic region in working with the piles to a point that we
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