CoatingsPro Magazine

MAY 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 47 of 92

COATINGSPRO MAY 2018 47 It's physica lly demanding work, too, said Carlisle. W hile w restling a heav y, awkward, and difficult-to-control hose, he sprayed from the bottom up so as not to push the product dow nward, which would promote r uns. Work ing in approxi- mately 5 - by 5 -foot (1.5 m x 1.5 m) squares, he t y pically made four to five 16 - to 20 -mil (406.0‒508.0 microns) passes in a crosshatch patter n, a llow ing the SPI Polyshield HT 100F to set up (approximately 8 seconds) bet ween passes w ith a 50 percent overlap. Just as Carlisle began putting on his Ty veks, a familiar Poly Seal pickup truck pulled up. Nate Morris, his boss, was behind the wheel. "Want me to spray?" Morris asked. Now, Morris has more than 25 years' experience with polyurea and he's the boss, right? Carlisle accepted the offer and shifted gears to begin reassembling weir parts his crew had pressure washed. Morris finished before day's end, and the crew headed home to rest up, knowing full well the next day would be their last — and most difficult — on this project. e following morning, Carlisle switched to a #29 tip on his AP Fusion gun and began spray applying polyurea to the trough, which was approximately 18 inches (45.7 cm) high on the inside wall by 12 inches (30.5 cm) on the bottom area by 36 inches (91.4 cm) on the sloped outer wall. e gutter-like structure was just barely wide enough to stand in, so to keep the Fusion gun aimed downward at the proper distance, Carlisle had to hold it at arm's length. No Small Potatoes "It was one of the most exhausting days I've had," Carlisle said. "I was holding the gun almost overhead and angling the nozzle toward the inside of the trough, working my passes, trying to keep the tip perpendicular to the substrate as much as possible. ere was substantial pitting in the steel, so the trick was to try to find an angle that would force the polyurea into the cavities rather than pushing it down so that it (covered but did not fill) the pits." Fourteen hours later, Carlisle set down his Fusion gun. e trough was done with an average of 100 mils (2,540.0 microns) DFT, significantly above the 80 mils (2,032.0 microns) specified, just to be sure of the outcome. "e Poly Seal crew did a great job and got us back on line in time," said Quenzer. "So far, everything looks good. We're so confident that we're actually considering doing the clarifier concrete floor with polyurea, too." e Poly Seal crew is rightfully proud of this project. ey worked safely, wearing proper personal protective equipment (PPE), such as gloves, air-supplied hooded respirators, dust masks, long-sleeved shirts, eyewear, and ear protection, as necessary. ey also worked under a tight deadline, pitched in to keep the blast crew on track, endured a raging dust storm, and impressed the heck out of a new client, with whom they had daily safety meetings. And that goes to show that this project was no small potatoes! CP Before the crew members could turn the tank back over to the client, they power washed and reassembled the weir parts. The final task was to spray the gutter-like trough. According to Dillon Quenzer, process reliability engineer for J. R. Simplot Co., the coatings client, "The Poly Seal crew did a great job and got us back on line in time." Wastewater Tank VENDOR TEAM Graco Inc. Equipment manufacturer 88 11th Ave. NE Minneapolis, MN 55413 (612) 623-6000 Milwaukee Electric Tool Co. Equipment manufacturer 13135 W Lisbon Rd. Brookfield, WI 53005 (800) 729-3878 Specialty Products, Inc. (SPI) Coatings manufacturer 2410 104th St. S, Ste. D Lakewood, WA 98499 (800) 627-0773 Tyvek by DuPont Safety equipment manufacturer 5401 Jefferson Davis Hwy. Richmond, VA 23234 (800) 931-3456

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