15.11.2010

Liebherr delivers second MTC78000

Liebherr has installed its second MTC 78000 heavy lift offshore crane on the OSA Sampson is one of the world’s largest heavy lift vessels destined for platform reconditioning, pipe laying and offshore wind turbine erection.

The 78,000 metre/tonne MTC 78000, the second of four units sold so far by Liebherr, was installed by 50 men working over 23 days at its Rostock facility.
Two Liebherr LHM 600 mobile harbour cranes working in tandem, were used to erect both the 78000 and a smaller CBO3600 also fitted to the vessel.
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The CBO3600 is installed in one piece after the MTC 78000 was completed.

The first and heaviest component was the 370 tonne slewing platform, followed by the machinery compartment and drive components weighing 240 tonnes, the 250 tonne lower mast section and the Upper mast section which weighed a modest 160 tonnes, but had to be lifted 43 metres above the pier.

The final step in the assembly process involved the installation of the 87 metre boom. The sheer size of the boom pivot pins required a specially developed hydraulic pinning machine.

The 100 tonne capacity 3600 was assembled and tested on a test stand in Rostock prior to being mounted in one piece aboard the vessel, substantially reducing the time the vessel spent in dock.

Overload test offshore

Once the two cranes were installed the vessel took to sea in order to conduct overload tests. A 1,760 tonne test weight – a 110 percent overload - consisted of two water filled pontoons which were lifted out of the water and slewed through 360 degrees.
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The MTC78000 lifts a 1,760 tonne test load to 35 metres radius

The MTC 78000 can lift 1,600 tonnes at up to 35 metres radius through 360 degrees. At its maximum main boom radius of 74 metres the crane can lift almost 530 tonnes.