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.