Ulstein CSOV / SOV / Walk-to-Work Vessel Designs

Ulstein CSOV / SOV / Walk-to-Work vessel designs are purpose-built ships that house technicians offshore and transfer them safely to wind turbines and installations via motion-compensated gangways, for construction, commissioning, maintenance and operations in offshore wind and oil and gas. Ulstein has designed or redesigned 23 walk-to-work vessels, 21 of them in operation, servicing more than 5,000 turbines and over 95,000 gangway connections per year; the first, Seaway Moxie, was delivered in 2014.

Key features

• Motion-compensated gangway systems for safe personnel transfer
• X-BOW®, X-STERN® and TWIN X-STERN® hull designs for improved seakeeping
• TWIN X-STERN®: symmetric hull with four azimuth thrusters (two at each end) for manoeuvrability, lower energy consumption and reduced motions
• Dynamic positioning for station-keeping close to turbines
• High accommodation capacity and onboard comfort
• Hybrid propulsion and energy storage for lower fuel consumption
• Prepared for alternative fuels
• Build in Norway or through Ulstein's global partner shipyard network

Design portfolio

• SX222 – 89.6 m length, 19.2 m beam, 126 POB, 500 sqm deck
• SX226 – 89.6 m length, 19.2 m beam, 120–130 POB, 500 sqm deck
• SX195 – 93 m length, 18 m beam, 80–120 POB, 500 sqm deck
• SX220 – 89.6 m length, 19.7 m beam, 120 POB, 500 sqm deck
• SX234 – 68.7 m length, 17.0 m beam, 47 POB, 125 sqm deck
• SX250 – 47.0 m length, 12.5 m beam, 32–40 POB, 65 sqm deck

References

• Windea Carnot (yard no. 322, 2026), Olympic Notos (yard no. 319, 2024), WINDEA La Cour (yard no. 309, 2016)
• Acta Pegasus (2025), Acta Centaurus (yard no. 313, 2019), ZHI CHENG 60 (2024), Seaway Moxie (2014)