Previous Page Next Page

Products Tech File Liebherr Debuts Heavy-lift Offshore Crane Technical Data Lifting Capacities Max. lifting capacity . . . . . . . . . . . . . . .up to 2,000 t . . . . . . . . . . . . . . . . . . . . . . . . . . . . .currently 1,600 t Dynamic moment . . .78,000 mt and/or 780,000 kNm Dimensions Height . . . . . . . . . . .54 m above base column flange Outer diameter . . . . . . .8,250 mm (slewing column) Main boom . . . . . . . .72.25 m (max. 1,600 t at 35 m) Auxiliary boom 1 . . . . .82.5 m (max. 500 t at 84 m) Auxiliary boom 2 . . . . .87.25 m (max. 50 t at 89 m) Weights (crane only) Total weight . . . . . . . . . . . . . . . . . . . . . . . . . . .1,420 t Boom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300 t Ropes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84 t Slewing bearing . . . . . . . . . . . . . . . . . . . . . . . . . .73 t Hook weights . . . . . . . . . . . . . . . . .64 t (main boom) . . . . . . . . . . . . . . . . . . . . . . . .20 t (auxiliary hoist 1) . . . . . . . . . . . . . . . . . . . . . . . .2.3 t (auxiliary hoist 2) Base column (current orders) Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 m 15 m Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .280 t 310 t Design . . . . . . . . . . . . . . . . . . . . . . . .round to square cylindrical Power Drive concept . . . . . . . . . . . . . . . . .electro-hydraulic Production . . . . . . .8 x 500 kW = 4000 kW = 4 MW . . . . . . . . . . . . . . . . . . . . . . . . . . . .(S1 performance) Type . . . . . . . . . . . . . . . . . . . . .ABB Electro engines Emergency generator . . . . . . . . . . . . . . . . . . .500 kW Hydraulic tanks . . . . . . . . . . . . . . . . . . . . .4 x 2,000 l The new Liebherr offshore crane, type MTC 78000, marks the Liebherr group of companies' entry into a new market segment of heavy-lift cranes for offshore applications. The MTC 78000 is one of the biggest offshore slewing cranes in the world and was designed using conventional anti-friction bearing technology. Featuring a maximum dynamic moment of 78,000 mt the MTC 78000 is the most powerful machine within the extensive range of cranes and material handling machines offered by the Liebherr group of companies. Maximum lifting capacities of up to 2,000 t The MTC 78000 achieves a maximum lifting capacity of 1,600 t at up to 35 m radius. This corresponds to a maximum dynamic moment of 78,000 mt, the crane still being able to slew over 360 degrees. At a maximum radius of 74 m for the main hoist the crane achieves a lifting capacity of almost 530 t. The boom length of the cranes currently ordered is 87 m. In addition to the main hoist, the MTC 78000 offers two auxiliary hoists with lifting capacities of up to 500 t and 50 t respectively. The dead weight of the new heavy-lift crane is 1,420 t without the base column, which weighs approximately another 300 t - depending on its design. The size of the MTC 78000 represents a new dimension in product development for Liebherr. The drive concept is based on an electro-hydraulic drive with 8 x 500 kW or 4 MW power. The two main winches offer a line pull of 500 kN (50 t) with a rope diameter of 48 mm. As the crane is mainly intended for application on mobile installations, the minimization of its dead weight was one of the main design requirements. In order to fulfill this requirement the supporting steel structure is made exclusively of high-strength fine-grained steel with a yield strength of 690 N/mm�. The standard equipment of the MTC 78000 features the proven Litronic control system with integrated display of load and radius as well as automatic load moment limitation. This is completed by special overload protections that are either activated electronically, automatically or manually. The crane's auxiliary hoist is fitted with a constant tension system exerting a tensile force on the hoist rope in case of significant wave height, thus ensuring that the hook follows the moving load. Two of the ordered MTC 78000 units will be used as heavy-lift cranes for the overhaul and/or renewal of existing off- shore platforms. Their main field of application is the assembly and disassembly of main components such as drilling derrick, accommodation module or various production modules. The cranes are also used for converting platforms from oil to gas production or vice versa and, therefore, they are mounted on a crane ship specially designed for these jobs. Approximately 300 of these ships specially designed for crane applications are in operation throughout the world. The design of the ships fulfils the requirements derived from the crane specification. Liebherr shall deliver the remaining two MTC 78000 units currently on order for applications on jack-up barges for assembly of wind power stations of the 5 MW class. The heavy-lift applications include the installation of Tripod foundations weighing up to 1,400 t as well as the assembly of single components with a dead weight of up to 500 t up to a height of 120 m above sea level or 106 m above deck. According to current plans, the first MTC 78000 will be delivered by the end of 2008. www.Liebherr.com June 2008 www.marinelink.com 81