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Liebherr - Heavy Lift Offshore Cranes

The heavy lift offshore crane, type CAL 64000 – 1500 Litronic®, specially developed by Liebherr for the company HGO Infra Sea Solutions GmbH & Co. KG, will be applied from 2012 on the INNOVATION, a special jack-up vessel for the quicker assembly of offshore wind power stations. With this innovative jack-up vessel assembly and maintenance times will be significantly reduced, thus productivity increased.

Maximum lifting capacities up to 1,500 t at a maximum radius of 31.5 m

The CAL 64000 - 1500 Litronic® achieves a maximum lifting capacity of 1,500 t at a maximum working radius of 31.5 m. The boom length of the crane currently on order is 105 m. The dead weight of the new large size crane is 1,500 t at a lifting height of over 120 m above deck.

The special feature of the heavy lift crane is its slewing ring with an outer diameter of 13 m. The slewing bearing alone weighs over 100 t. Moreover, the crane is designed as 'Crane Around the Leg', i.e. it is built around one of the vessel's four legs. Up to now the CAL 64000 - 1500 Litronic® is the first heavy lift offshore crane in the world to be built according to this design.

Advantages and performance characteristics

This specially developed crane type, which is able to rotate 360° around the vessel's leg, offers a relatively small obstruction area of 12 m, which - together with a slewing ring inner diameter of 11 m - allows for ideal positioning of the crane around the vessel's leg. Thanks to the special "Twin" boom design, the boom can even be lowered and parked over one of the vessel's front legs. This solution prevents the crane from obstructing free space on deck which can be used for loading the jack-up vessel.

Besides the powerful electro-hydraulic drive with 4,000 kW, the Litronic® control system developed by Liebherr as well as the integrated power management provide optimum performance in all operating conditions.

As an option a slewing unit (rotator) for loads of up to 600 t is available for the CAL 64000 - 1500 Litronic®.

Flexible application

Per annum the CAL 64000 - 1500 Litronic® will install more than 80 wind turbines with heights of over 120 metres down to a maximum water depth of 50 metres for the joint venture of HOCHTIEF Construction and the project and heavy lift cargo shipping company BELUGA Shipping.

The enormous lifting capacity of the heavy lift crane enables the installation of over 5 MW strong turbines and rotors as well as the loading and subsequent safe installation of the heaviest foundations. Apart from the installation of offshore wind power stations the crane is also suitable for the oil and gas market, e.g. for assembly and disassembly of platforms or other structures.

Production, transportation and set-up

The size and weight of the individual components of the CAL 64000 - 1500 Litronic® partly required the adaptation of the company's own production facilities at Liebherr-MCCtec Rostock GmbH. Not only special machines for mechanical processing were necessary but also the enlargement of clearance heights and widths in the workshops and, to some extent, on internal site roads.

With a dead weight of 1,500 t and a 105 m long boom the innovative heavy lift crane is too big to be transported to the Crist Shipyard in Gdynia/Poland in one piece. For this reason, the crane will be transported to Poland in several parts weighing up to 600 t and will be assembled on site.

Due to the design of the CAL 64000 - 1500 Litronic® around the rear vessel leg of the INNOVATION the assembly of the crane is closely co-ordinated with the completion of the jack-up vessel as the 'Crane around the Leg' must be positioned before the vessel leg.

With the CAL 64000 - 1500 Litronic® Liebherr offers a further representative of its extensive range of offshore heavy lift cranes featuring maximum lifting capacities of up to 3,000 t.

Contact

Tel: +43 50809 41-0
Fax:+43 50809 41-500
E-mai: info.lwn@liebherr.com
URL: http://www.liebherr.com