08224 Evaluating the Corrosion Protection of a Nuclear Submarine Drydock

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A flamesprayed thermoplastic coating was applied in 2000 to the sheet piles of the Delta Pier, located at Naval Submarine Base at Bangor, Washington. That coating system quickly failed. This paper discusses several rehabilitation strategies, the construction restraints, and how these divergent factors were resolved.

Product Number: 51300-08224-SG

ISBN: 08224 2008 CP

Author: Ryan Tinnea and Bruce Ostbo

Publication Date: 2008

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The Delta Pier, located at Naval Submarine Base Bangor at Bangor, Washington, has served as the West Coast dry dock for the US Navy’s Trident submarines since its completion in 1979. A flamesprayed thermoplastic coating was applied to the sheet piles of the pier in 2000 and that coating system quickly failed. In January of 2007, the sheet piles of Delta Pier were inspected for corrosion damage. In concert with the inspection, the Navy requested that a replacement coating system be recommended. Many of the sheet piles on Delta Pier are located behind a section of closely spaced concrete piles that support concrete piers. The proximity of the concrete piles so severely limits construction access that traditional coating systems, such as high performance organic coating systems or thermal spray aluminum with a sealer may be economically infeasible. This paper discusses several rehabilitation strategies, the construction restraints, and how these divergent factors were resolved to allow clear recommendations to be made. Additional strategies include covering the sheet pile tidal and splash zone areas with cast-in-place concrete or cladding with a copper nickel alloy.

Keywords: marine, sheet pile, coating, thermoplastic, pier