Great Lakes Dredge & Dock Other service
Subsea Rock Installation (Acadia)
Precision subsea rock installation for scour, cable and pipeline protection using Acadia, a Jones Act-compliant DP2 vessel with 20,000 t rock capacity.
Description
GLDD's Offshore Energy sector, formed in 2021, provides subsea rock installation for subsea foundations, cable protection and pipeline stabilization. Its vessel Acadia, built at Hanwha Philly Shipyard in Philadelphia, is described as the first and only Jones Act-compliant subsea rock installation vessel.
Key features
- DP2 dynamic positioning, multi-beam survey system and active heave compensated fall pipe
- Accurate rock placement to 65 m water depth
- Rock hold capacity 20,000 t
- EPA Tier 4-compliant engines, battery energy storage system for peak shaving, shore power connection while loading, biofuel-ready
- ABS class with SUSTAIN-2 notation; CFD-enhanced hull
Applications
- Scour protection for offshore wind foundations
- Export and inter-array cable protection
- Pipeline stabilization
GLDD, in joint venture with Van Oord, has performed rock installation for the Empire Wind 1 offshore wind farm off New York. A second SRI vessel is planned with up to 40,000 mT capacity and capability to 600 m.
Specifications
| Loa | 140.5 m / 461 ft |
|---|---|
| Lpp | 134.9 m / 442 ft |
| Beam (moulded) | 34.1 m / 112 ft |
| Depth (main deck) | 10.7 m / 35 ft |
| Draught (operational) | 7.0 m / 23 ft |
| Service speed | 12 kn |
| Installed power | 2 x 3,150 kW – 2 x 2,250 kW |
| Propulsion thrusters | 2 x 2,500 kW |
| Retractable thruster | 2 x 1,200 kW |
| Tunnel thrusters (fwd) | 2 x 900 kW |
| Positioning system | DP 2 |
| Class | ABS |
| Rock hold capacity | 20,000 t |
| Complement | 45 P |
More from Great Lakes Dredge & Dock
- Trailing Suction Hopper Dredging
- Cutter Suction Dredging
- Mechanical Dredging
- Rivers, Lakes & Reservoirs Dredging
- Booster Pumping
- Subaqueous Drilling & Blasting (Drillboat Apache)
- Support Fleet: Tugs, Workboats, Multicats & Auxiliary Vessels
- Channel & Port Maintenance and Deepening
- Coastal Protection & Restoration
- Land Reclamation
Featured services
All services →
Inspection, Survey & Testing
General Dynamics Mission Systems
Submarine Test & Evaluation Services
Dockside and at-sea testing supporting submarine Integrated Combat System certification, weapon system accuracy trials and developmental/operational test.
Other service
Commercial Diving
In-house certified commercial diving including surface/mixed-gas diving to 299 ft and saturation diving 250-1200 ft; ADCI member with company-owned equipment.
Rental / Leasing
ABS Ocean Barge Charter
ABS-classed A-1, Maltese Cross oceangoing deck barges, US-flagged and Jones Act compliant, from 140' x 40' x 9' up to the 400' x 99'9" x 20' MARMAC 400.