Twin City Yard Lays Keel For Seagoing Split-Hull Dredge

Twin City Shipyard, Inc., St. Paul, Minn., recently laid the keel far a seagoing dredge that will join the fleet of Gulf Coast Trailing Company, Kenner, La., late this year. The new dredge—to be launched under the name Mermentau—is a sister dredge of the Atchafalaya, launched last, year for Gulf Coast Trailing, and which is presently in service in East Coast waters.

Ronald A. Rossway, vice president of Twin City Shipyard, said the new vessel, 196 feet 10 inches long and 40 feet 8 inches wide, will feature both a hinged split-hull for the rapid dumping of dredged spoils, and hopper doors for pumping dredged spoils ashore. Propulsion is by deck-mounted twin 850-hp engines with propellers rotatable 360 degrees to provide high maneuverability.

The shallow-draft dredge, with a maximum working draft of 14 feet 7 inches, will be used for diverse dredging operations in shallow rivers or for large coastal projects.

The hinged deckhouse has messing and berthing facilities for 16 men.

The Mermentau will be fitted with two dragarms, or trailing suction pipes, mounted on each side of the ship's forward section, and capable of dredging to depths of 65 feet.

Its hopper, occupying most of the midship area, will have a capacity of about 1,300 cubic yards of dredged material.

Upon arrival at the disposal area, the hinged hull will open hydraulically into two halves and dredged material will fall through the gap thus created. If conditions require, as in beach reclamation projects, the dredge pump may be used to remove material from the hopper and pump it ashore. This operation is particularly useful when environmental considerations preclude the use of bottom dumping, Mr. Rossway said.

Maritime Reporter Magazine, page 44,  Jul 1981

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.