CoatingsPro Magazine

NOV 2018

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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COATINGSPRO NOVEMBER 2018 53 Sands, another historic U.S. Nav y unit. It's a oating dry dock that can lift 12 million pounds (5.4 million kg), double the weight of the Turner Joy. As most can imagine, a dry dock of this size is booked up well in advance. Compounding the challenge, with 40,000 visitors a year, the Turner Joy also has a jam-packed schedule, so it was di…cult to †nd a time to take the vessel out of service for several weeks. "Before we even began the work, we had a plan well in advance," said Stebbins. "W hen we saw a window that worked for both organizations to do the work, we sprang into action. We had to execute that plan in very short order." W hen Lake Union †rst worked on the ship in 2001, they crafted an approach for the cleaning and sandblasting, hull repairs, and coating system of the vessel. Žey applied similar principles of that plan again. Working with International Paint Company/AkzoNobel, the vessel owners selected a coating system that is both cost e"ective and able to provide protection over an extended period. Everything was in place. Now, the work could begin. "The dry dock crew was so accommodating," said John Hanson, president of he association. He showed the fundraisers the progress of the work. "Not many people get to walk underneath a Nav y ship." The 50-person crew worked round the clock to get the job done, which included work on manlifts, and they wore safety harnesses and were trained and qualified to operate the lifts. JOB AT A GLANCE PROJECT: Preservation the hull of the 418-foot-long (127.4 m) USS Turner Joy COATINGS CONTRACTOR: Lake Union Drydock Company 1515 Fairview Ave. E Seattle, WA 98102 (206) 323-6400 SIZE OF CONTRACTOR: ~150 employees SIZE OF CREW: ~50 craftsmen PRIME CLIENT: Bremerton Historic Ships Association 300 Washington Ave. #8 Bremerton, WA 98337 (360) 377-4002 SUBSTRATE: Mild steel and HY-80 steel plates CONDITION OF SUBSTRATE: Small holes and numerous thin areas found SIZE OF JOB: 26,250 sq. ft. (2,438.7 m²) of underwater hull, including ~2,000 sq. ft. (185.8 m²) of boottop, plus 6,300 sq. ft. (585.3 m²) of freeboard hull DURATION: 3½ weeks UNUSUAL FACTORS/CHALLENGES: » They had to find a time that worked for the contractor and client. » The six-million-pound (2.7 million kg) ship had to be refloated and shifted to provide access to areas obscured by the blocks. MATERIALS/PROCESSES: » Blasted using Black Diamond Iron Silicate abrasive product, and spot blasted the freeboard using waterblasting » Spray applied underwater coatings: one full coat of Intergard 269 at ~2 mils (50.8 microns) dry film thickness (DFT); one full coat of Intershield 300V bronze at ~8 mils (203.2 microns) DFT; and one full topcoat of Intershield 300V aluminum at ~8 mils (203.2 microns) DFT » Spray applied boottop coatings: the same three coatings as the under- water coatings plus one coat of Interthane 990 black polyurethane, applied at ~2 mils (50.8 microns) DFT » Spray applied freeboard coatings: a spot coat of Intergard 264 red epoxy at ~5 mils (127.0 microns) DFT to bare metal; a spot coat of Intergard 264 at ~5 mils (127.0 microns) DFT; a spot coat of Interlac 2V at ~1 mil (25.4 microns) DFT; and a full coat of Interlac 2V at ~2 mils (50.8 microns) DFT to owner-designated freeboard surfaces SAFETY CONSIDERATIONS: » Wore Occupational Safety and Health Administration (OSHA)-approved personal protective equipment for every step » Were equipped with OSHA-approved safety harnesses and fully trained and qualified on operating man lifts

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