Mammoet to replace leg cranes in two vessels


Mammoet has been contracted by GustoMSC to carry out leg crane replacements on two offshore wind-farm installation jack-up vessels (Wind Orca and Wind Osprey) for the Danish transport and installation company Cadeler.

Next-gen turbines are growing, and their components are getting larger and heavier. To meet the enhanced installation and maintenance requirements of their components, the equipment used to move, lift, and install them must be upgraded and replaced.

Mammoet’s new leg cranes are fully electrically driven and have a 1,600-ton lifting capacity, (Courtesy: Mammoet)

The new leg cranes are fully electrically driven and have a 1,600-ton lifting capacity, making them ready to install and service next-generation wind turbines with capacity ratings exceeding 14 MW.

This project represented a unique one for Mammoet, using not only one of the biggest cranes in its fleet but also its own yard in Schiedam to perform the job. The location allowed a rare opportunity to schedule projects simultaneously to increase their efficiency.

For the project, Mammoet used its PTC210-DS crane, one of five 5,000-ton class ring cranes in its fleet. The colossal size and stature of the crane belie its greatest strengths – its versatility and ability to operate in areas where space is limited. 

“The PTC210-DS is the perfect crane for this job,” said Dirk Knoester, Mammoet senior adviser. “It has a relatively small footprint combined with 360-degree slewing, with the possibility to switch between fixed and luffing jib mode (as only the PTCs can) resulting in the largest possible working area.”

“Our yard has a unique location in the port of Rotterdam, and this gave us the possibility to position the crane between the two vessels and serve them at the same time,” said Remco Zandstra, Mammoet senior commercial manager. “Not only does this save considerable time, by minimizing movements of cranes in the yard and vessels along the quay, it also creates the safest possible solution to perform this project.” 

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