TOW OF DRYDOCK NASSCO BUILDERProject SummaryThe 800 ft long drydock NASSCO BUILDER was sold to a shipyard in Everett and needed to be wet towed from San Diego, CA, to Everestt, WA. The rail mounted crane on the dockwall needed to remain in place during the tow, which required lashing the crane to the dockwall and supporting its counterweigth to withstand the anticipated accelerations. Because of the lengthening of the drydock in the early nineties, the wet tow required some severe wave height restrictions. At the end of the summer in 2025, during a favorable weather window, the drydock was successfully towed to its new owner in Everett by the 92 t BP tug DELTA DEANNA. Scope of WorkThe project scope included:Project PhotographsPhotographs courtesy of Everett Ship Repair. |
specialists in marine heavy-lift transportation engineering
naval architects
marine surveyors
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Est. 1992
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Model the drydock hull including all its ballast compartments;
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Determine the design environmental criteria for the tow;
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Calculate design drydock motions and resulting inertia loads on the dockwall mounted crane;
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Provide lashing plan for the dock blocks;
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Check the intact and damaged stability of the drydock in tow condition;
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Survey the drydock and the rail mounted crane on the dockwall.
Drydock NASSCO BUILDER departing San Diego towed by DELTA DEANNA
