CRANES AND CARGO HANDLING
Bespoke crane orders for dredger and trans-shipment operations
MONGST recent contracts for Austria- headquartered manufacturer Liebherr was one to supply a special travelling deck crane for installation on the new mega cutter/suction dredger D'Artagnan. This interesting vessel was built by IHC Holland Merwede and is presented in The Naval Architect November 2005, page 30, and in Significant Ships of 2005. The customer, Belgian owner DEME, requested a design for a travelling crane to carry out repairs and maintenance on the dredging equipment as well as the handling of heavy weights. Liebherr provided a tailor-made solution in association with both shipyard and owner. As a basis for the order, Liebherr used its CBW- type electro-hydraulic ram-luffing deck crane. The straight-fix boom was redesigned as a curved-fix boom with an auxiliary hoist, allowing sufficient outreach for, amongst other tasks, replacing the cutter head at the bow. Lifting capacity is 40tonnes, and the crane has a maximum outreach of 23m and a minimum of 18.15m.
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Dredging operations have to be stopped during replacement of the heavy cutter; therefore the jib was designed in the shape of a bow in order to ensure that the distance between the lifting gear for the special cutter and the tip of the jib is kept to a minimum, thus avoiding extensive swing of the cutter during lifting due to heel and trim conditions. An additional remote control system was delivered, allowing the operator to observe the maintenance operations more closely and so increase efficiency and safety.
Meanwhile, in the Ukraine, a Liebherr CBG 25/30 Litronic floating cargo crane, mounted on an eccentric platform on the crane barge Atlas-1, has recently completed its first season transferring coal, sulphur, and grain between Volga and Don river barges and Panamax-sized vessels. This is the first time that Liebherr has installed a CBG 25/30 bulk handling system on a 10m eccentric arm, and the company claims that the design 'fully satisfies the customer's demand for heavy-duty offshore transhipment'. The positioning of the crane, with its 7.5m cabin extension, alongside the vessel, ensures high safety in operation and allows efficient grab handling due to the improved visibility. The configuration allows shortening of the boom from 40m to 30m, which reduces grab swing and consequently increases productivity in transhipment operations, with up to 40 cycles hourly. The floating crane is certified to Lloyd`s Register standards.
For this crane design, Liebherr can offer specific offshore options, including special heavy-duty hoisting winches, a strengthened boom, heel trim alarm systems, and emergency operation functions. These features would allow crane operation under heavy sea state conditions with wave heights up to 2.5m. With a maximum lifting capacity of 25tonnes in grab operation at 30m working radius (plus 10m for the eccentric arm), the crane on Atlas-1 is achieving an average rate of 750tonnes/h in calm seas and approximately 600tonnes/h under more
THE NAVALARCHITECT FEBRUARY 2006
D'Artagnan, believed to be the largest ever self-propelled cutter suction dredger, is installed with a specially modified Liebherr travelling deck crane (seen here) that is able to deal with exchange of cutter heads at the bow.
Pictured here is the Liebherr CBG25/30 Litronic crane at work on the Ukrainian crane barge Atlas-1. Trans-shipment rates of up to 750tonnes/h (40 cycles) are being achieved, and an order has been placed for a second crane to be installed on a new barge.
difficult conditions. For cleaning up ship holds, the Ukrainian owner Transship Ltd uses bulldozers and wheel loaders, which can be lifted onboard with the crane in hook operation (with a maximum lifting capacity of 30tonnes, up to 26m working radius).
As a result of the successful operation with Atlas-1 and the performance of the Liebherr floating cargo crane, Transship, based in Odessa, has placed a second order for a new crane barge Atlas-2, which will start operation in early summer time this year.
New production facility
Liebherr has established an additional production site for maritime cranes, with a total area of
220,000m², in the harbour area of Rostock on the German Baltic coast. Production commenced here in mid-March 2005 and is currently concentrated in one workshop in which steel construction, mechanical assembly, and painting are carried out. A large assembly workshop and the administration building were completed at the end of 2005.
Due to the positive order situation in the maritime market, Liebherr-Werk Nenzing decided to start production in Rostock earlier than originally planned. At the present time, 214 employees are employed there, 50 of which are contractors. Further employees are being trained at the headquarters in Nenzing.
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