Monopile Feedering

As monopiles (MPs) grow larger, feedering them on supply barges becomes increasingly interesting: some of the older installation vessels only have sufficient deck space left for 1 of 2 XXL piles, and deck space is occupied by additional noise mitigating hardware, larger hammers and other auxiliary tooling.

How to safelift such heavy loads on near capacity cranes?

Rehits versus dynamics

Monopiles with diameters of 10m or larger are huge piles, but still delicate to impact loads on its sides. For example, an impact hit with one of the fastening saddles can cause a pile to dent like a cola can, endangering the structural strength required for the next 30 years the pile forms the foundation of the offshore turbine.

Therefor, quick and sufficient clearance is needed when lifting the pile from a supply vessel. But at the same time, these piles can weigh 2500mT or higher, and contractors sometimes need to lift with cranes where such loads are reaching full capacity.

How to accelerate quickly to get clearance, but still keep your dynamic loading (DAF) lower than 1.1? That's what Seaqualize technology is especifically designed for, and it can do so for the heaviest loads.

How? Learn more here.

"Seaqualize technology makes sure that older Jackup Vessels, can still play a relevant role in foundation installations" - Client tender manager

The Heave Chief keeps the DAF low, cargo and crew safe, and keeps on going

For several clients, we have analysed how to best lift heavy X(X)L monopiles, both with floating and jacked crane vessels. Using our inhouse dynamic simulation software package Vortex, we can show time-based analyses of every lifting phase.

We've modelled a Heave Chief for 3000mT lifting. Using its spead of 1,0m/s, it can create clearance to the deck quickly, even with seafastening saddles that form a vertical collision danger. As we pretension the load up to 90%, while fully compensating all wave motions using the Balanced Heave Compensation technolgy, only the last remaining weight has to be accellerated during the fast lift. Our software can be set to keep your DAF under 1.1, or even lower if needed.