Micro-organisms in the Great Lakes threaten to damage steel marine structures, disrupting marine commerce. With the invasion of these creatures, the longevity of any metal surface underwater – such as steel sheet piling – has been reduced to just 50 percent of their intended life.

Dock owners all over the Great Lakes are faced with the costly replacement of steel sheet piling in order to keep up with the demands of marine commerce and the stability of their docks.

Marine Tech has developed solutions to control the corrosion and to avoid new construction of our region’s aging docks. Dock owners find these options appealing and effective as opposed to the replacement of these structures.

Coating with Aquapure: Docks with serious corrosion, but whose steel structures are still viable, can have decades added to their life with the application of Aquapure coating either before installation or in situ.

The process is relatively simple, requiring the use of specially designed portable cofferdams. We first place the cofferdam on the dock wall needing repair, dewater then clean and prepare the surface by sandblasting. Once the face of the sheet metal is free of all corrosion, the Aquapure coating is applied using a process involving heating the epoxy-based coating and spraying with an plural component pump.

Because the application process happens in place – below the surface of the water – it requires not only specialized equipment, but also a great deal of innovation.

Repair and Coating: For those docks and other structures with corrosion so severe it has impacted the integrity of the sheet pile dock wall, there is another solution. This innovative, proprietary method involves using Aquapure-coated steel plating and concrete – again with all the work performed in place and in a dry environment with specialty built cofferdams at a much lower cost than replacement. Best of all, the work is done without disrupting the commerce across the owner’s dock.

Working in Place: Marine Coating’s engineers designed and built coffer dams in order to work on steel sheet pilings in place, below the water’s surface. Two coffer dams work side-by-side, to hold back water pressure equaling 1,000 pounds per square foot against the coffer dam walls as well as approximately 100,000 pounds of uplift.

Once sealed against the sheet pilings and the water is extracted from the coffer dams, the repair process can begin, allowing the crews to work in a dry environment, enabling the highest quality repair.

Dock owners find it to be an appealing and effective option to replacement of steel sheet piling.


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Extending the life of sheet pilings below the water’s surface in place – saving millions of dollars.