Ulstein designed subsea rock installation vessel will be America’s first
Tuesday, November 23, 2021

reat Lakes Dredge & Dock Co. LLC (GLDD), U.S. leading dredging company, has ordered the first U.S.-flagged and Jones Act compliant subsea rock installation vessel, an ULSTEIN S211 design. Designed by Rotterdam based Ulstein Design & Solutions BV (PIB USA Member), the first vessel will be constructed by Philly Shipyard and is expected to enter operations by Q4 2024 to serve the U.S. offshore wind market. The contract includes the option for a 2nd vessel. 

World-renowned engineering firm Ulstein Design and Solutions B.V. was commissioned by us to design the vessel using state-of-the-art technology, equipment, and automation”, states Eleni Beyko, Great Lakes Dredge & Dock’s Senior Vice President Offshore Wind. “The design was reviewed and approved by the American Bureau of Shipping (“ABS”) and will be built with best-in-class safety and low emissions standards (LEV, Sustain2).

To reach the low emission and sustainability goals, the vessel design includes EPA Tier 4 engines, plug-in shore power connection for loading in ports and battery packs for peak-shaving. The vessel is also able to run on biofuel to reduce CO2 footprint and is equipped with active emission control technology to minimise NOx emissions.

In the concept phase the Ulstein Blended Design method was used to enhance cargo efficiency, to boost the GLDD business case, and reduce overall fuel consumption.

It is a privilege to work together with the GLDD newbuilding team. Their vast experience in U.S. shipbuilding, combined with our expertise of rock installation vessel design, was essential in creating this unique vessel for U.S. offshore wind sector”, says Ko Stroo, lead designer in Ulstein Design & Solutions B.V.

Main dimensions of the vessel are:

Loa 140,5 m / 461 ft Propulsion thrusters 2 x 2,500 kW
Lpp 134,9 m / 442 ft Retractable thruster 2 x 1,200 kW
Beam (moulded) 34,1 m / 112 ft Tunnel thrusters (fwd) 2 x 900 kW
Depth (main deck) 10,7 m / 35 ft Positioning system DP 2
Draught (operational) 7,0 m / 23 ft Class ABS
Service speed 12 kn Rock hold capacity 20,000 t
Installed power 2 x 3,150 kW
2 x 2,250 kW
Complement 45 P


For more information on this news release please contact
Mr Edwin van Leeuwen at Ulstein Design & Solutions B.V., T: +31 10 475 00 11, E: udsbv.info@ulstein.com
or look on our website www.ulstein.com
 Ulstein Design & Solutions B.V. specializes 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.
ULSTEIN is a family-owned group, headquartered in Ulsteinvik, Norway. ULSTEIN delivers products and services within ship design, shipbuilding and equipment packages to the international market within offshore, expedition cruise and offshore wind segments. For over 100 years, ULSTEIN has been associated with innovation and quality in design and delivery, meeting the demanding marine challenges by embracing change and identifying opportunities. ULSTEIN’s vision is to create tomorrow’s solutions for sustainable marine operations.