CoatingsPro Magazine

MAY 2017

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 MAY 2017 55 machine can't keep up, everything grinds to a halt." So half the crew staged in Speers while the other half geared up on the Belle Vernon side. e equipment list was staggering. It included two Atlantic Design, Inc. (ADI) eight-pot combo grit blast, vacuum, and recycle systems; two ECS 40K dust collectors; six Ingersoll Rand 1600 CFM (45.3 m³/min.) air compressors; two Eagle decontamination trailers; four JLG man lifts; five pressure washers; three WIWA airless spray rigs; and two hazardous waste dumpsters. Spanning the Spans e crew used 45- and 85-foot (13.7 m and 25.9 m) JLG lifts, a Snooper under-bridge access crane, and existing catwalks to install a series of 1,000-foot-long (304.8 m), ⅝-inch-thick (1.59 cm) underdeck support cables that ran the length of the bridge. To the support cables, the crew then attached a Safespan- designed scaffolding system that utilized corrugated decking much like that found on commercial roofs. e crew also rigged a massive containment system to safeguard people, vehicles, streets, buildings, railroad tracks, and the Monongahela River When the Titan crew arrived at the Belle Vernon /Speers Bridge, it wa s in poor condition. There were area s of heav y corrosion and a buildup of various coatings that existed from over the years. With most of the project spanning over a river, access was a major task from the get go. To reach all areas of the bridge, the crew used massive scaffolding. JOB AT A GLANCE PROJECT: Abrasive blast and coat a bridge that spans the Monongahela River COATINGS CONTRACTOR: Titan Industrial Services, Inc. 4054 North Point Rd. Baltimore, MD 21222 (410) 477-1857 SIZE OF CONTRACTOR: 95-135 employees SIZE OF CREW: 55-65 crew members PRIME CLIENT: Pennsylvania Department of Transportation (PennDoT) 400 North St., 5th Floor Harrisburg, PA 17120 (717) 787-2838 SUBSTRATE: Steel CONDITION OF SUBSTRATE: Poor condition with heavy corrosion and existing coatings SIZE OF JOB: ~900,000 sq. ft. (83,612.7 m²) DURATION: ~2 years total UNUSUAL FACTORS/CHALLENGES: » A large mobile crew required 12 homes to provide housing. » Massive scaffolding and containment were required for access. » Planning and coordination were required to minimize bridge lane closures. MATERIALS/PROCESSES: » Abrasive blasted to NACE No. 2/Society for Protective Coatings (SSPC) Surface Preparation (SP) 10: Near-White Metal Blast Cleaning » Used hand power tools to remove caulking from 100+ core box corners » Spray applied one pass of Sherwin-Williams Zinc Clad III primer to achieve 5-6 mils (127.0-152.4 microns) dry film thickness (DFT) » Sprayed Sherwin-Williams Macropoxy 920 with hand pump bottles into core box corners using a flooding technique » Caulked all core box corners, open crevices, open joints, and other areas with Sherwin-Williams Loxon polyurethane sealant » Spray applied one pass of Sherwin-Williams Macropoxy 646 high-build epoxy to achieve 6-8 mils (152.4-203.2 microns) DFT » Spray applied one pass of Sherwin-Williams Acrolon 218 topcoat to achieve 2-4 mils (50.8-101.6 microns) DFT » Pressure washed bridge deck suspension cables » Used painter's mitts to apply two coats of Rust-Oleum Noxyde at 7-9 mils (177.8-228.6 microns) DFT each » Used painter's mitts to apply a single 1.5-2.5 mil (38.1-63.5 microns) topcoat of Rust-Oleum 3700 DTM acrylic enamel SAFETY CONSIDERATIONS: » Wore fall protection, respirators, and blast hoods as required

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