National Oilwell recently delivered its largest-ever hydraulic telescopic crane, a 300-ton system, for the Solstad Shipping subsea construction vessel Norman Cutter. Hydra tech partnered the company in developing and manufacturing the accumulator and cylinder equipment.
Accumulator in Hydra tech's workshop.
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The 300-ton crane hydraulic package consisted of three 550-mm-diameter main boom cylinders, one 400-mm and two 380-mm-diameter telescopic cylinders, and a four-chamber-active heave-compensation accumulator with a linear positioning system. The package also included numerous smaller cylinders, all DNV certified.
Hydra tech designed the AHC accumulator to allow servicing in very limited confines, as it is being built in under the deck. It is easily separated in the middle, and the sealing can be changed with less than one extra meter of space. The built-in length transducer is of a flexible type that can be changed without having to demount the accumulator. The length positioning system is a new type with profibus, which can be connected directly to the data bus of the vessel.
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Ulstein's yard in Norway converted the state-of-the-art Norman Cutter vessel. During conversion, the vessel's width increased by 3.5 m, and the 300-ton crane was fitted along with a moonpool and carousel for flexilay operations. Conversion was completed in May 2004. The vessel is under long-term contract to Sonsub on deep-sea projects.
For more information, contact Anders Nielsen, phone +45 98980200, email: [email protected]
