TRAILING SUCTION HOPPER DREDGES

Hopper dredges are designed to vacuum material from the sea floor through drag arms that load the material into the hold of the vessel. The cargo of mud, or sand, can then be transported to either an ocean disposal site, where the material is dropped to the bottom through openings in the bottom of the hull, or at an upland site such as a beach, or reclamation, where the material is pumped ashore by the ship. This method is most suited when excavating loose material from open areas for delivery to a distant disposal location. These vessels are generally certified to sail in coastal or ocean waters and are suited for working in rougher sea conditions beyond those suitable for other dredging plants.

ELLIS ISLAND

U.S. Coastwise Qualified

Length: 480 ft (146.3 m)
Breadth: 92 ft (28 m)
Depth: 36 ft (11 m)
Draft: 30 ft (9.2 m)
Dredging Depth: 122 ft (37.2 m)
Suction Diameter: 2 @ 36 in (914.4 mm)
Discharge Diameter: 34 in (863.6 mm)
Hopper Capacity: 14,800 yd³ (11,315.4 m³)
Propulsion Power: 13,404 hp (9,995.4 kW)
Dredge Pump Power: 10,000 hp (7,457 kW)
Total Installed Power: 28,625 hp (21,346 kW)

LIBERTY ISLAND

U.S. Coastwise Qualified

Length: 325 ft (99.1 m)
Breadth: 59 ft (18 m)
Depth: 31 ft (9.4 m)
Draft Loaded: 27.5 ft (8.4 m)
Dredging Depth: 108 ft (32.9 m)
Suction Diameter: 2 @ 31.5 in (800 mm)
Discharge Diameter: 30 in (762 mm)
Hopper Capacity: 6,540 yd³ (5,003 m³)
Propulsion Power: 9,920 hp (7,400 kW)
Dredge Pump Power: 8,200 hp (6,117 kW)
Total Installed Power: 15,566 hp (11,612 kW)

TERRAPIN ISLAND

U.S. Coastwise Qualified

Length: 315.6 ft (96.2 m)
Breadth: 68.4 ft (20.8 m)
Depth: 24.2 ft (7.4 m)
Draft: 22.5 ft (6.9 m)
Dredging Depth: 80 ft (24.4 m)
Suction Diameter: 2 @ 33.5 in (851 mm)
Discharge Diameter: 33.5 in (851 mm)
Hopper Capacity: 6,400 yd³ (4,893 m³)
Propulsion Power: 7,453 hp (5,560 kW)
Dredge Pump Power: 2,800 hp (2,089 kW)
Total Installed Power: 15,206 hp (11,344 kW)

DODGE ISLAND

U.S. Coastwise Qualified

Length: 281 ft (85.6 m)
Breadth: 53 ft (16.2 m)
Depth: 21.5 ft (6.6 m)
Draft Light: 9.5 ft (2.9 m)
Draft Loaded: 19.65 ft (6.0 m)
Dredging Depth: 70 ft (21.3 m)
Suction Diameter: 2 @ 27 in (686 mm)
Discharge Diameter: 24 in (610 mm)
Hopper Capacity: 3,600 yd³ (2,754 m³)
Propulsion Power: 4,350 hp (3,245 kW)
Dredge Pump Power: 3,000 hp (2,238 kW)
Total Installed Power: 10,929 hp (8,153 kW)

PADRE ISLAND

U.S. Coastwise Qualified

Length: 281 ft (85.6 m)
Breadth: 53 ft (16.2 m)
Depth: 21.5 ft (6.6 m)
Draft Light: 9.5 ft (2.9 m)
Draft Loaded: 19.65 ft (6.0 m)
Dredging Depth: 70 ft (21.3 m)
Suction Diameter: 2 @ 27 in (686 mm)
Discharge Diameter: 24 in (610 mm)
Hopper Capacity: 3,600 yd³ (2,754 m³)
Propulsion Power: 3,000 hp (2,238 kW)
Dredge Pump Power: 3,500 hp (2,611 kW)
Total Installed Power: 9,395 hp (7,009 kW)

SUGAR ISLAND

U.S. Coastwise Qualified

Length: 281 ft (85.6 m)
Breadth: 53 ft (16.2 m)
Depth: 21.5 ft (6.6 m)
Draft Light: 9.5 ft (2.9 m)
Draft Loaded: 19.65 ft (6.0 m)
Dredging Depth: 70 ft (21.3 m)
Suction Diameter: 2 @ 27 in (686 mm)
Discharge Diameter: 24 in (610 mm)
Hopper Capacity: 3,600 yd³ (2,754 m³)
Propulsion Power: 4,350 hp (3,245 kW)
Dredge Pump Power: 1,700 hp (1,268 kW)
Total Installed Power: 9,395 hp (7,009 kW)

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The Ellis Island

The Ellis Island recently commenced dredging operations on Phase 1 of the MSCIP Comprehensive Barrier Island Restoration Plan in the U. S. Gulf of Mexico offshore of Gulfport Mississippi. With a 15,000 cubic yard capacity Ellis Island is the largest hopper dredge in the U. S..

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