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In March 2012, A2Sea signed a brand new contract with COSCO Shipyard Group Co. Ltd., for the construction of yet another jack-up vessel specially designed for installing offshore wind turbines.

The USD 155 million agreement with COSCO Shipyard Group Co. Ltd. was for a vessel identical to Sea Installer. Delivered in March 2014, the vessel has been optimised to operate at depths of up to 60 metres depending on tide and penetration, making it well suited to installing upcoming offshore wind projects in Northern Europe.

With the offshore market in Northern Europe growing quickly, the demand for installation vessels will grow dramatically. With this vessel, A2Sea is well prepared to meet that demand, strengthening our position as a supplier of installation services. And we’ve taken another big step toward shortening installation time, thus bringing down the cost of offshore wind energy.

Download brochure Sea Challenger – Technical specifications and track record


Technical Specifications

Vessel: Sea Challenger
Type of vessel: DP2, self-propelled jack-up vessel
Classification: DNV GL
Flag: Danish

Length: 133.25 m
Breadth: 39 m
Draft: 5.8 m
Leg length: 82.5 m
Deck load: 15 t/m²
Free deck space: 3,350 m² (subject to deck layout)
Total net deck load: Approx. 7,400 t available for cargo/seafastning/ballasting for stability

Service speed 12 kn Max
Operating water depth: 6.5–55 m (depending on tide, penetration)

Jack-leg System
No. of legs: 4
Jacking system: Double hydraulic system
Jacking speed: 0.40 m/min
Spudcan footprint: 106 m²
Wave limit jacking: 1.8 m Hs (subject to site-specific assessment)
Elevated weight: 20,500 t

Main Crane
Type: Gusto GLC-900-ED-S
Crane capacity:
95 m boom length, 900 t @ 24 m outreach (623 t @ 30 m)
115 m boom length, 700 t @ 28 m outreach (632 t @ 30 m)

Cargo Crane
Type: Marine cranes
No. of cranes: 5
Crane capacity:
2 no. 3.4t @ 25 m max 20 t
2 no. 2.5 t @ 25 max 10 t
1 no. 4 t @ 33 m max 30 t

Tank Capacity
Fuel: 1,000 m³
Fresh water: 550 m³
Sewage tanks: 400 m³

Power Sources
Main engines: 6 x 3020 kW
Power supply: 6.6 kV, 400V, 230V, 110V, 50 Hz

Charterers’ Accommodation
Charterers’ personnel: 35 persons
Charterers’ cabins: 35 single cabins
Office facility: 2 offices with 6 desks
Other facilities: Rest lounge (shared with vessel crew)
Mess room (shared with vessel crew)
Gym facilities (shared with vessel crew)

D-value: 22.2 m
T-value: 12.8 t
Can be used both floating and jacked up



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