The Ulstein designed GLDD subsea rock installation vessel for US offshore wind.

Rock installation: Awarded ship design contract for U.S. Offshore Wind Industry

Great Lakes Dredge & Dock contracted Ulstein Design & Solutions BV to design the first U.S. flagged Jones Act compliant, inclined fallpipe vessel for subsea rock installation. The vessel is critical in building the future of the U.S. offshore wind industry, including establishing a U.S. based rock supply chain network.
14 December 2020
  • The rock installation vessel will be installing protective layers of rock at offshore wind turbine foundations by means of an inclined fall pipe system.

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"We are extremely proud that Great Lakes Dredge & Dock Co. LLC (GLDD) has entrusted us to develop their new asset", says Edwin van Leeuwen, managing director at Ulstein's Dutch design office.

"We much enjoyed the cooperation with the GLDD team in developing the concept over the last couple of months, even though we never met physically due to the COVID-19 travel restrictions. Our team is eager to continue the further development of the vessel with GLDD."

The vessel will primarily serve the growing needs in US offshore wind, installing protective layers of rock at offshore wind turbine foundations by means of an inclined fall pipe system. Furthermore, its large and strong aft deck area makes the vessel a highly flexible asset to GLDD enabling specialised subsea operations.

Blended design method

"At the start of the design we applied our newly developed 'Blended Design' method, enabling GLDD to co-evolve their business case with the ship concept. This resulted in significant gains in economic performance, at the same time reducing fuel consumption and emissions, by optimising vessel main dimensions, speed and dynamic positioning capability". mentions Ko Stroo, Ulstein's lead naval architect and project manager. "Our design for this US Coast Guard compliant vessel strongly focused on Jones Act compliant shipbuilding in the USA and ease of construction."

The Basic Design will be developed by Ulstein's Dutch design office, with strong engineering contributions from its sister offices in Norway and Poland.

Ulstein Design & Solutions B.V. specialises in the design and development of game changing ships for the offshore energy market. Sometimes brilliantly simple, sometimes necessary complex. We push for sustainable solutions. Besides newbuild designs, Ulstein Design & Solutions is actively involved in consultancy and feasibility studies for upgrading vessels.

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Ulstein Group result 2023

In 2023, Ulstein Group recorded revenues of NOK 1.4 billion and an operating profit of NOK 49 million. The knowledge and experience Ulstein have gained through more than a hundred-year history have created a dynamic and flexible organisation that we now benefit from in the transition to a greener and gradually more fossil-free future.

Edwin van Leeuwen Ulstein 19 comp bw

Edwin van Leeuwen

Managing Director

Ulstein Design & Solutions B.V.

Ulstein Design & Solutions B.V.