CoatingsPro Magazine

JAN 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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Page 87 of 116

COATINGSPRO JANUARY 2018 87 started on the cone (aka the angled portion leading into the pedestal). e solution was simple: Reblast that area and then paint it. In the end, "It all worked out," according to Winter. Because the DH blew air in and the crew had fans at the top pulling air out, they didn't need any extra ventilation. ey did wear personal protective equipment (PPE), though, such as blast hoods from Bullard, dust masks, steel-toed boots, and cover- alls. According to Winter, Blastco requires that the blast guys wear welding gloves, which go higher on the arm. "It just gets it up a little higher from any ricochet from the blast media," he explained. As with the other interior portions, two crew members spray applied the lining: International Paint Polibrid 705E. ey used Graco plural component equipment with 20-foot (6.1 m) hoses attached to shipping containers mounted outside the tank. e Polibrid 705E is a solvent-free elastomeric urethane, and it was applied to an average thickness of 30 mils (762.0 microns) in one pass. A lthough the crew checked it with a wet film thickness gage that day, Winter assured that the dry film thickness (DFT) is chief. "We checked it the next day with our DFT gages for mil It took four weeks to install the containment, which used panels from Eagle Industries. Each day, it was winched up at the start and dropped back down at the end of the day. Using stages, the crew applied a ~3-mil (76.2 microns) coat of Interzinc 52 using Graco plural component equipment. That layer was then sanded and stripe coated with Interfine 1080 using rollers. JOB AT A GLANCE PROJECT: Coat and line a 1-million-gallon (3,785.4 m³) elevated water tank COATINGS CONTRACTOR: Blastco, a TF Warren Company 1400 Woodloch Forest Dr. Ste. 500 The Woodlands, TX 77380 (832) 299-3200 SIZE OF CONTRACTOR: 120 employees SIZE OF CREW: 10 crew members PRIME CLIENT: City of Austin P.O. Box 1088 Austin, TX 78767 (512) 974-2000 SUBSTRATE: Steel CONDITION OF SUBSTRATE: Good SIZE OF JOB: ~20,000 sq. ft. (1,858.1 m²) each for interior and exterior DURATION: 6 months UNUSUAL FACTORS/CHALLENGES: » The drawings missed the addition of a panel to cover a trough on the outside of the tank; it cost the crew seven weeks (and some blast) by the time the city figured it out and the cover could be added, blasted, and primed. » It took four weeks to install the self-made containment. » The crew dealt with heat. MATERIALS/PROCESSES: » Blasted with ARS Advanced Recycling equipment and AMASTEEL from Ervin Industries to achieve a NACE No. 2/Society for Protective Coatings (SSPC) Surface Preparation (SP) 10: Near-White Blast Cleaning » Used a dehumidifier from Dehumidification Technologies to hold the blast on the inside » Spray applied the interior lining, ~30 mils (762.0 microns) of International Paint Polibrid 705E, using Graco plural component equip- ment with 20-foot (6.1 m) hoses » Spray applied the exterior coatings from two 20-foot-long (6.1 m) stages: ~3 mils (76.2 microns) of Interzinc 52; sanded and stripe coated with Interfine 1080; and ~7 mils (177.8 microns) of Interfine 1080 SAFETY CONSIDERATIONS: » Wore personal protective equipment (PPE), such as Bullard hoods, dust masks, steel-toed boots, coveralls, and welding gloves when blasting » Wore Tyvek suits, paint socks, safety glasses, and rubber gloves when painting » Wore harnesses and lanyards from Web Devices when at heights

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