Germany: At the end of June, Liebherr delivered the first heavy lift offshore crane type MTC 78000 from its manufacturing plant in Rostock.
The MTC 78000 is one of the biggest offshore slewing cranes in the world.
With a maximum dynamic torque of 78,000 tonnes, the MTC 78000 is the most powerful machine within the range of cranes and material handling machines offered by the Liebherr group of companies.
Four units of the new heavy-lift crane have already been ordered to date.
Despite its size, the MTC 78000 has been designed as a slewing crane and is supported by traditional large-diameter anti-friction bearings. With a weight of 70 tonnes, the swing ring has a diameter of approximately nine metres.
The manufacturing of such large mechanical parts can only be accomplished through complicated custom processes as conventional gear cutting machines are only available for large-diameter anti-friction bearings up to a diameter of five metres.
The MTC 78000 achieves a maximum lifting capacity of 1,600 tonnes at up to 35 metres in radius. This corresponds to a maximum dynamic moment of 78,000 tonnes, the crane still being able to slew over 360°. At a maximum radius of 74 metres for the main hoist the crane achieves a lifting capacity of almost 530 tonnes.
The boom length of the crane currently delivered is 87 metres. In addition to the main hoist, the MTC 78000 offers two auxiliary hoists with lifting capacities of up to 500 tonnes and 50 tonnes respectively.
The deadweight of the new heavy-lift offshore crane is 1,420 tonnes without the base column which weighs approximately another 300 tonnes, depending on its design.
The size of the MTC 78000, which is derived from customer requirements, represents a new dimension in product development for Liebherr. The drive concept is based on an electro-hydraulic drive with eight 500kW or 4MW power. The two main winches offer a line pull of 50 tonnes with a rope diameter of 48mm.
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