Shipbuilding. Energy. Transport

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Sea Installer at Damen Shiprepair Amsterdam for crane upgrade

Major modification work will bring A2SEA-owned vessel into line with growing demands of offshore wind industry

Damen Shiprepair Amsterdam (DSAm), part of Damen Shiprepair & Conversion, is currently undertaking a major modification and maintenance project on the jack-up vessel Sea Installer. In what is a multidisciplinary project, the yard’s primary focus will be 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.

Arriving at DSAm on 10 April, the Sea Installer took her position alongside lay-by berth number 1. The smooth running of this project is facilitated by the prefabrication of key components at nearby Niron Staal Amsterdam, also part of Damen Shiprepair & Conversion.

Niron Staal fabricated and supplied the new boom rest, hook block pockets, trolley rail and support stools. With these parts ready from the outset, DSAm was able to commence the project at maximum capacity.

Serious lifts
The Sea Installer project also involves some notable lifting procedures: DSAm has created 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. In line with the yard’s high offshore quality lifting procedures, these were compiled in close collaboration with Mammoet.

Planning on schedule
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. 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 (long 700 tonnes and short 900 tonnes).

DSAm is also paying close attention to the state of 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 Mr 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.”

Damen Shiprepair & Conversion
Damen Shiprepair & Conversion has a worldwide network of 15 repair and conversion yards with dry docks ranging up to 420 x 80 metres. Conversion projects range from adapting vessels to today’s requirements and regulations to the complete conversion of large offshore structures. DSC completes around 1,500 repair and maintenance jobs annually.

About A2SEA
A2SEA is the market leader within transportation, installation and service work for offshore wind farms. Since its foundation in 2000, A2SEA has installed approx. 50% of the world’s offshore wind turbines. A2SEA recently completed installing turbines on Gode Wind 2+1 and Borkum Riffgrund 1. Upcoming projects include turbine installation on Burbo Bank Ext., Dudgeon OWF, Race Bank OWF and Arkona OWF. The company is headquartered in Fredericia with subsidiaries in Hamburg and London. A2SEA currently has more than 260 employees dedicated to the offshore wind industry.


Please see Damen Shipyards Group company electronic office

Damen Shipyards Group operates 32 shipbuilding and repair yards, employing 9,000 people worldwide. Damen has delivered more than 6,000 vessels in more than 100 countries and delivers some 180 vessels annually to customers worldwide. Based on its unique, standardised ship-design concept Damen is able to guarantee consistent quality.
Damen’s focus on standardisation, modular construction and keeping vessels in stock leads to short delivery times, low ‘total cost of ownership’, high resale values and reliable performance. Furthermore, Damen vessels are based on thorough R&D and proven technology.

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