Materials Performance

MAR 2017

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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43 NACE INTERNATIONAL: VOL. 56, NO. 3 MATERIALS PERFORMANCE MARCH 2017 COATINGS & LININGS ESSENTIALS Continued on page 45 DeFelsko Corporation l Ogdensburg, New York USA Tel: +1-315-393-4450 l Email: techsale@defelsko.com Measures the concentration of soluble salts on metal surfaces using the Bresle method n Displays test duration, sample temperature, conductivity (µs/cm) and surface density n Easy 1-2-3 gage interface guides users through the Bresle method n Includes PosiSoft suite of software for viewing and reporting data NEW 1 -800-448-3835 www.defelsko.com In novative P o siPatch TM n N o adhesive residue n No sharps, no needles! For use with all B resle pat ch t ypes including t he innovat ive PosiPat ch Power Plant Leaks Are Dust in the Wind Photo courtesy of Creative Polymers, Inc. At the Ameren Missouri (St. Louis, Mis- souri) coal-fired power plant, the areas that are used to convey coal into furnaces, called tripper rooms, were fraught by a cloud cov- ering. e facility owners at this plant needed to do something about it. Dust in a power plant is a fire hazard, after all, which meant that regular cleanup was required. To find a better solution, the facility is mov- ing to wash downs, but even that was hav- ing some issues. Leaks were starting to show—until now. Because the coal and dust weren't going anywhere, the facility decided it needed to do something about the leaks. "Water would be dripping down in an area below the application area, but finding where it came from was not easy to determine be- cause the water would sometimes run along a beam for a distance before drip- ping," explains Will Strupp, project man- ager/estimator for Coatings Unlimited, Inc. (St. Louis, Missouri). To be on the safe side, the client contracted Coatings Unlimited to help with a more encompassing solution. But first, they had to gain access. At ~100 ft (30.5 m) in the air, the rooms were far from the ground level where the larger equipment was stationed. e crew had to get their blast hoses and air lines up to the project area before they could start work- ing. "It did prove quite challenging," Strupp says. Luckily, they were able to use a freight elevator for any materials that had to be in the work area, such as the spray pumps. e larger equipment stayed on the ground, so the crew used walkie-talkies to com - municate. e crew, which averaged six people, started by abrasive blasting the ~15,000 ft 2 (1,393.6 m 2 ) of uncoated steel. ey used a fork truck to load all 3,000 lb (1,361 kg) of the abrasive super sacks into the 6-ton (5,443-kg) blast pot. "Abrasive blasting brought the steel back to a cleanliness level sufficient for the coating material to be ap- plied," says Strupp. For this step, they also used a 1,300 CFM (36.8 m 3 /min.) compres- sor, two blast nozzles, and fans perma- nently affixed to the walls of the building "that helped remove dust for clarity while working," Strupp continues. While abrasive blasting, the crew wore air-fed hoods, long-sleeved shirts, and long pants. Although the clothes helped keep the

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