A MAJOR modification and maintenance project on the jack up vessel Sea Installer is currently being undertaken by Damen Shiprepair Amsterdam (DSAm), part of Damen Shiprepair and Conversion.

The yard’s primary focus is to upgrade the vessel’s main crane.

With its increased lifting capacity, the 132 metre A2SEA owned vessel, which is used chiefly for offshore wind farm installation purposes, will be able to take on a broader scope of work as offshore wind activities involve heavier and larger components.

In mid-April the vessel arrived at DSAm and the company expects to complete the project within a two month timeframe.

Damen said the project is being facilitated by the prefabrication of key components at nearby Niron Staal Amsterdam, also part of Damen Shiprepair and Conversion.

Niron Staal fabricated and supplied the boom rest, hook block pockets, trolley rail and support stools.

Damen said the advantage of having these parts ready from the outset is that DSAm was able to commence the project at maximum capacity.

To address the project’s lifting challenges, DSAm created a temporary lifting and storage area alongside the vessel’s berth.

Damen project manager Daniel Gerner explained the group will need to remove a total of 569 tonnes from the vessel and lift a further 702 tonnes back on board again.

The yard has calculated a number of plans for the use of an LR1600-2 Mammoet crane to perform the lifts, in order to avoid problems.

With the vessel’s boom, boom rest, A-frame, winch and hook block pockets already removed from the vessel, operations are now in full swing, Damen said.

Ready for lengthening, the boom has been positioned on a support structure consisting of 15 stacked shipping containers.

A2SEA is providing the new a-frame and winch, Damen said.

In terms of capacity, the crane will be upgraded from a single mode 800 tonne crane to a double mode long and short 900 tonne crane.

“We have divers currently in the water to inspect the spud cans – and we are also replacing one of the jacking cylinders,” Mr Gerner said.

“The strong winds that we had here during the first couple of weeks have set us back a bit, but we are still on course for timely completion. If necessary, we can ramp up our work schedule by moving to 24/7 operations,” he added.