ENERGY Ӏ SECTOR REPORT
monopiles higher, allowing more
sea transports to take place using existing support structures.
COST REDUCTIONS According to Mammoet the system minimises upgrades to grillage and sand bunds, helping customers to reduce costs as Mammoet customers don’t need to build new storage facilities/transport facilities for these larger components. This is particularly pertinent against the backdrop of several high-profile offshore wind projects which have been put on hold recently due to rising supply chain costs. The new jacking and cradle
system adds 60cm of additional stroke over and above the standard SPMT systems. The system comprises two
elements: jacking spacers that sit between SPMT modules to generate greater stroke, and hydraulic, foldable saddles that cradle the monopile so it can be supported at higher points to prevent excessive ovalization. Each jacking spacer has a
capacity of 430 tonnes split across two towers – with multiple units in use per transport configuration. The system slots between SPMT modules, so transport configurations maintain the same minimum ride height. This enables grillages and sand bunds to remain as low as possible – again saving on costs. Each monopile saddle has a
capacity of 1,000t and can handle monopiles up to 12m diameter. By using the system, Mammoet
says its customers can maintain the existing methods of supporting and moving monopiles, even as they grow from 8m to 10m diameter, and beyond. This reduces whole- project costs right through the fabrication, shipping and storage supply chains. Also in offshore wind,
38 CRANES TODAY
Mammoet is ‘making waves’ in Rotterdam with the erection of its 3,200 tonne capacity PTC 210 ring crane at its Schiedam yard. The crane is being used to install the cranes that install wind turbines. Specifically, it is being used to remove the existing leg cranes from two of Cadeler’s jack- up vessels and replace them with new high-capacity ones. More on this in next month’s special report. In the nuclear
(decommissioning) sector Mammoet has achieved a ‘world first’ extracting a reactor and internals in three parts using custom strand jack. It assisted Orano USA with the extraction of a sectioned 540-tonne nuclear reactor vessel (RV) at the shutdown Crystal River Unit 3 pressurised water reactor site in Florida, USA.
The removal of the RV is part of the accelerated decommissioning of the facility, which began generating electricity in 1977. It's not just renewables that the company is active in. In the oil and gas sector, for example, Mammoet was extensively involved in the construction of the Dangote Petroleum Refinery in Nigeria, which has now started production. It has also just entered into a
strategic partnership with Aertssen Machinery Services (AMS), the Belgian heavy-lifting company, to provide heavy lifting and transport solutions to industry sectors, including oil and gas, in Qatar. And in September 2023 Mammoet announced the successfully completion of jacking, loadout and floatover operations for a 19,600 tonne offshore
Monopile
gripper from Huisman
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