Page 5: of Maritime Reporter Magazine (September 1986)

Artist's rendering shows dredge Chicago in clamshell mode with barge alongside

World's Largest Clamshell/Dipper

Dredge To Be Delivered This Year

To Great Lakes International

The dredge Chicago, said to be of future dredging requirements, ac- the world's largest and most power- cording to Mr. Colnon. The Chica- ful combination clamshell/dipper go has been designed specifically for dredge, is scheduled for completion work in the ports of the U.S., includ- and assignment by the end of this ing the deepening of proposed deep- year, according to Great Lakes In- water ports, as well as in the ports of ternational, Inc., the vessel's owner, the rest of the world. The invest-

William L. Colnon, president of ment of $30 million in the new

GLI, announced that when the Chi- dredge and the two barges is the cago is completed, it will provide largest single appropriation in the unequaled capabilities and versatili- company's 100-year history, ty for the dredging industry in both The first design criterion for the the clamshell and dipper modes. Chicago was to double the capabili-

In order to effectively utilize the ty of any clamshell or dipper dredge unprecedented production capacity in existence. The P & H model 5700 of the new dredge, two large split- electric excavator was selected as hull, hopper dump barges have been the most efficient digging machine designed and are also presently un- available for that purpose. This re- der construction. This bold ad- volving unit, weighing nearly 100 vancement in the bucket dredge tons, is under construction at Har- field was based on a careful analysis nischfeger Corporation in Milwau-

DREDGE 'CHICAGO' kee' The dredSe wil1 have a 50-Cub-

Maior Suppliers ic-yard clamshell bucket, whereas

Main engine EMD-GM the largest clamshell currently in

Auxiliary generators Caterpillar operation uses only a 26-cubic-yard

Hydraulics Heath Engineering bucket.

Electrical instrumentation GE The Chicago will develop a dipper

Dredge computer . . Dredge Technology hoist pull of 480,000 pounds at a line

Gyrocompass Sperry speed of 240 feet per minute, about

Fuel separator ... Alfa-Laval twice that of the next largest dipper

Coo ,ngwater/b,lge/f,re pumps Goulds currentl in operation anywhere in

Heating/a^conditioning ' ! ! the world In addition, the dredge

Firefighting system Kidde has been designed to operate with a

Watermaker Alfa-Laval 27-Cubic-foot dipper bucket, com-

Sewage treatment Microphor pared with the 14-cubic-yard dipper

Crane Harnischfeger that is the biggest presently in use.

Service Crane Unit Crane The hull of the Chicago, being

Spud winches Falk built by Southern Shipbuilding Cor -

Deck winches Mobile Pulley & p0ration in Slidell, La., will be more n t . t .. MachineWorks than twice the size, by volume, of Quarters International Building Systems . , , hWest clamshell and dinner

Paint International Paint ™day JP ciamsneii ana cupper dredges. Ihe cross-sectional area of the new vessel's spuds (a measure of the ability to work in rough seas) will be 2Vz times that of similar existing dredges. Its total installed output of 8,650 horsepower is al- most four times greater than that of today's largest dipper, and seven times more than that available in clamshell dredges at present.

The two new barges are being constructed by Bay Shipbuilding

Corporation in Sturgeon Bay, Wise.

With a 6,000-cubic-yard capacity, they are IV2 times the size of the next largest barge of this type in use, and have an overall length of 277 feet and beam of 63.5 feet. They will be towed by 5,600-bhp tugs of twin propeller, Kort nozzle design.

Working in either the clamshell or the dipper mode, the Chicago will provide a continuous operation, dredging the material and disposing of it without interruption, even if the disposal area is far removed from the dredge site. The exception- al dipper power also enables the dredge to excavate extremely diffi- cult material that might have other- wise required blasting.

For additional information in- cluding detailed literature on the services offered by Great Lakes In- ternational,

Circle 32 on Reader Service Card

For copies of free color literature being offered by Bay Shipbuilding on their facilities and capabilities,

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September, 1986 7