Great Lakes Dredge & Dock Announces Shipyard Contracts for an ATB Trailing Suction Hopper Dredge and Two New Material Scows


Great Lakes Dredge & Dock Corporation (GLDD), provider of dredging services in the United States and a major provider of commercial and industrial demolition and remediation services, has announced the execution of definitive contracts for the construction of a 15,000 cubic yard capacity (11,500 m3) Trailing Suction Hopper Barge and 14,000-horsepower Tug.
When delivered in the second quarter of 2014, these vessels will function as an Articulated Tug & Barge ("ATB") Trailing Suction Hopper Dredge and will comprise the largest hopper dredge in the United States.

The Company has contracted with Signal International Inc., operating from Mobile (Alabama), Orange (Texas) and Pascagoula (Mississippi), for the construction of both vessels, with an option to build an additional dredge, should domestic or international market conditions warrant.
Signal International will perform the detail design and construct the dredge in Orange, based on a patent pending engineered design and performance specification provided by Great Lakes.
The aggregate cost of the initial dredge is expected to be approximately $94 million.

Great Lakes' patent pending design for the dredge introduces a new concept for hopper dredging in both deep and shallow waters, providing extensive flexibility.
The new dredge, with a hopper capacity of 15,000 cubic yards (11,500 m3), applies well-known and proven ATB technology to hopper dredging, enabling the Company to continue its leadership in the dredging industry as the low cost provider.
The dredge will feature two 36-inch suction pipes and will be able to dredge at depths of up to 125 feet.
Even with a maximum load it will only have a draft of 28 feet, the best carrying-capacity-to-draft ratio in the U.S. dredging industry.
The new dredge will be well-suited to multi-use applications.
It will be deployed for channel deepening, maintenance dredging, beach nourishment, and coastal restoration projects with long distance transport capabilities.

The tug and barge hull form design was optimized at MARIN, a state of the art leading testing facility in nautical research and development, located in the Netherlands.
The vessel features a proven Articouple interconnect system for the tug and barge.
Its high-tech ATB design includes all of the latest innovations and developments in dredging technology.
MARIN's Senior Project Manager Klaas Kooiker stated, "Having modeled and tested many of the world's modern hopper dredge hull forms, we were very pleased to see the Great Lakes ATB hull achieve similar speed and power results.
We believe this is the first ATB hull to equal ship performance capabilities."
The ATB will be equipped with a direct high power pump-ashore installation, a hybrid power sharing configuration between the tug and barge, dynamic positioning and tracking, EPA Tier III compliant engines, and additional features designed to minimize the impact of its dredging process on the environment.

Source: Great Lakes Dredge & Dock Corporation (GLDD), 3 August 2012