Damen Shiprepair Amsterdam (DMAm), is currently undertaking a major modification and maintenance project on A2SEA’s heavy maintenance and construction jack-up vessel Sea Installer. The yard’s primary focus will be to upgrade the vessel’s main Gusto GLC-900-ED-S electrically driven bogie crane, which is wrapped around one of the jack-up leg. In terms of capacity, the crane will be upgraded to a double mode long 700 tonnes and short 900-tonne crane. The increased lifting capacity will be able to take on a broader scope of work as offshore wind activities involve heavier and larger components.
The Sea Installer was built by Cosco (Nantong) Shipyard, China and delivered in 2012. It was developed specifically for large offshore wind turbine installation work. With a total length of 132.41m and beam of 39m, it has a total net deck load capacity of 5000 tonnes (depending upon stability) equivalent to carrying up to 10 wind turbines simultaneously.
Arriving at DSAm on 10 April, the Sea Installer took her position alongside lay-by berth number 1. Prefabrication of key components will be undertaken at nearby Niron Staal Amsterdam, also part of Damen Shiprepair & Conversion group. They supplied the new boom rest, hook block pockets, trolley rail and support stools.
The Sea Installer project also involved creating a temporary lifting and storage area alongside the vessel’s berth to accomplish these safely and effectively. “We need to remove a total of 569 tonnes from the vessel and lift a further 702 tonnes back on board again,” explains Damen Project Manager Daniel Gerner. The yard will use an LR1600-2 Mammoet crane to perform the lifts. Consequently, the preparations also included calculating the numerous lifting plans
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. 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.
DSAm is also inspecting the Sea Installer‘s jacking equipment. “We have divers currently in the water to inspect the spud cans and we are also replacing one of the jacking cylinders.”
“We are looking at finishing this considerable project within a 2-month timeframe,” states Daniel Gerner. “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.”