VIGOR INDUSTRIAL, Ketchikan, AK3,600 LT Capacity Dock with Transfer

See More Floating Dry Dock Design

In 2005, HEGER designed a steel floating drydock based on parameters provided by ALASKA SHIP AND DRY DOCK (now owned by VIGOR INDUSTRIAL). The dock was constructed in China and delivered to Alaska in July, 2007.

The dock is designed to be capable of lifting vessels displacing up to 3,600 long tons. The dock is also designed to accommodate longitudinal transfer of vessels displacing up to 2,000 long tons from the dock to one of two shoreside berths or vice-versa.

To carry out vessel transfers, the dock is floated over and then landed on an underwater support grid. Once on landed on the grid, the dock’s ballast tank flood valves are left open and no further ballast control is required as the tide goes in and out or when the vessel is being moved onto or off of the dock. There is a 23′ tide range at the site and the dock is completely out of the water at low tide.

To submerge the dock, the dock is floated off the grid at a high tide and translated laterally to a dredged submergence berth.

Plan view schematic of Alaska 36000 long ton floating transfer dock — Figure 1 – Dock General Arrangement

Cross section schematic of Alaska 36000 long ton floating transfer dock — Figure 2 – Dock Cross Section

Alaska 36000 long ton floating transfer dock shown landed on grid at low tide — Figure 3 – Dry Dock Shown Landed on the Grid at Low Tide

Transfer dock support grid at low tide — Figure 4 – Support Grid, Shown at Low Tide

Transfer car bogie for floating transfer dock — Figure 5 – Transfer Car Bogie

Vessel in 36000 long ton floating transfer dock — Figure 6 – Vessel on Dock

BATH IRON WORKS, Bath, ME
28,000 LT Capacity Transfer Dock

HEGER DRY DOCK
3,000 LT Capacity Dock

VIGOR INDUSTRIAL, Ketchikan, AK
3,600 LT Capacity Dock with Transfer

Dockmaster’s Training Manual

A Proud Member of