398 January 2007
Innovative ATB From Entech & Associates
One of the more innovative vessels currently being built to a Frank Basile/Entech design is the ATB tug for Brice Construction of Fairbanks Alaska. The 84x36-foot tug will be coupled to a 248x54-foot barge using an Articouple system from Taisei Engineering of Japan (www.articouple.com). The Articouple-coupler is a two-point articulate connection the permits free pitching of the pusher relative to the barge. A model of the tug and barge was tank tested through to sea state 5 by Vison SciTec Inc. at their Ocean Engineering Centre in Vancouver B.C. The tests resulted in slight modifications to the bow rake of the barge.
To achieve the desired ten-knot speed for the combination tug-barge with the required shallow 6.5-foot draft for river operations, three of Cummins' new Tier II complaint QSK19 M engines were selected. Each of the three engines will deliver 660 horsepower continuous duty to one of the three 63x54-inch props in Rice Speed Nozzles with triple rudders. For travel in open waters the 1980-hp tug, with a molded depth of 11.3 feet, will be capable of ballasting down to 8.9-feet.
The tug is currently under construction at the Chiasson Welding facility in Larose, Louisiana, while the barge is being built at a yard in Houma. Delivery is anticipated in the spring of 2007. The owners' representative to the project is James Huffman Sr.
Cummins Marine QSK19 Marine Tier 2
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