PRE-ASSEMBLY
T he growing scale of turbines is having a huge impact on assembly requirements, with hub heights of up to 175m and nacelle weights pushing 1,000t. This is causing some projects using smaller or container ports to either reinforce the ground or avoid the quay edge entirely in order to perform pre-assembly work. Keeping the installation vessel waiting is never an option. So, components must be stored for easy access and brought to the water’s edge and as few time-consuming transfer or upending maneuvers as possible. These demands have meant that fewer and fewer conventional cranes are up to the task, leaving only the world’s largest cranes – such as Mammoet’s PTC and SK models – suitable for the job. The large radius of these cranes moves lifting away from the quay edge onto surer ground, while their giant hook heights allow turbine assembly to take place on or next to the quay, where it is most efficient. Their huge capacities allow loads up to 6,000t to be placed directly onto barges, which is a much more efficient alternative to SPMT jacket load-out.
JACK-UP UPGRADES Many installation vessels will need to be upgraded in the coming years in order to manage the larger size of components that are becoming standard. Downtime for these upgrades must be kept to a minimum, so specialist help can be required to replace equipment such as cranes as efficiently as possible. Mammoet can do this – removing and replacing legs and the crane itself where needed. FAST MOBILIZATION AND DEMOBILIZATION Installation vessels often need special- ized assets to be moved on and off board in a short space of time to ensure work stays on schedule. Mammoet provides the expertise and equipment for this to be done as efficiently as possible; commonly including cranes, rigging and SPMTs – ensuring your vessels are correctly equipped to return to work as soon as possible. We can also help to maneuver components on deck; for example, by up- ending monopiles using a combination of SPMT, tailing frame and the crane’s hook.
Some of our pre-assembly services typically include, but are not limited to: • Crane lifting and critical lift plans • Lifting tools design • Trained and experienced operators • Co-ordination of lifting and assembly operations with bolting and electrical connections • Full site and facilities management • Assistance with loadout
operations together with jack-up operator
• Co-operation with
mechanical contractor
GREATER LIFTING POWER FOR BIGGER COMPONENTS
SMART CABLE MANAGEMENT
Demand for the world’s largest cranes is growing and creating a potential bottleneck for offshore wind projects given their limited availability. Recognizing the market needed greater lifting capacity, Mammoet has developed the SK6,000. Capable of lifting over 4,000t to a height of 175m and with a maximum reach of 144m , it can turn the quayside into a highly efficient production line by lifting even the heaviest of components directly into assembly position or onto a vessel. Designed to operate with maximum outreach and capacity in the minimum required footprint, the SK6,000 helps to free up valuable space on site whilst delivering a variety of lifts from just one position to execute projects as quickly and efficiently as possible. What’s more, the crane’s propulsion systems can be electrically driven, meaning it can run from connection to mains electricity or hydrogen fuel systems, with no CO 2 emissions. The same is true for our SK190 and SK350 cranes.
Mammoet can provide a flexi- ble, cost-effective alternative to fixed cable carousels. A standard cable basket is placed on SPMTs, which are used in a carousel configura- tion to spool or unspool cable. This means cable winding can take place at the most convenient point on site and can be easily moved when needed. When finished, the bas- ket can then be lifted by crane and stored out of the way.
015
Made with FlippingBook - Online magazine maker