CoatingsPro Magazine

JUL 2015

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 JULY 2015 63 Using the thickness gage, the crew could tell the coating wasn't going on exactly evenly. "We had some problems getting it right, getting the fnish correct," Johnson said. "But then at the end, we got some power trolls that we were doing much better with, using circular trolls to get the surface smooth." Because the job was so large, the team also had to get special equipment. "We had to get a special mixer to mix that quantity of Belzona," Johnson said. Te team was able to cover 300 to 1,000 feet (91.4–304.8 m) a day. Teir progress was sometimes slowed because the chambers were two to three stories high, which meant setting up and taking down scafolding, Johnson said. Te team also wore fall protection, including harnesses, while working on the scafolding. A ll crew members also wore gloves, hard hats, and protective clothing while applying the coating. And despite the movement of the scafolding, the team gradually made progress. Te inspector would make a report each day for the city on how the progress was going, Johnson said. And it showed that they were slogging along. Another factor for the crew to overcome was the weather, Johnson said. W hile much of the work was indoors, there was still the humidity to factor in. "We had to watch in some areas, because you can't apply coating in over 80 percent humidity," he said. "We had a lot of rain." Tere were some days when the crew just could not work because of the humidity. Te temperature was also a factor on a few days because the team was working in an area that had not been covered yet. "Tey had covers, but they weren't on yet, so we had to put heaters in there," Johnson said. Another challenge came when coating one of the structures called the junction box. It tied together two of the chambers. "It had a big valve, and you could close it of," Johnson said. "W hen it opened up, we had to be careful there wasn't excess hydrogen sulfde gas coming in." The first layer was Belzona 4911 TX, a conditioner primer, and the second layer was Belzona 4111 Magma Quartz. The 4111 was applied at an average of 1-inch (6.35 mm) thickness in one pass. JOB AT A GLANCE PROJECT: Provide coating and protection from abrasion to new concrete contain- ment tanks for a wastewater treatment plant COATINGS CONTRACTOR: Belzona Texoma, Inc. 1216 Executive Dr. W Richardson, TX 75081 (305) 594-4994 SIZE OF CONTRACTOR: 6 consultants SIZE OF CREW: 6–10 crew members PRIME CLIENT: City of Dallas 1500 Marilla St. Dallas, TX 75201 (214) 670-5111 SUBSTRATE: Concrete CONDITION OF SUBSTRATE: New SIZE OF JOB: 62,000 sq. ft. (5,760 m 2 ) DURATION: One year UNUSUAL FACTORS/CHALLENGES: » Texas weather brought humidity, which meant coating couldn't be applied on some days » The structure was more than two stories tall, so scaffolding and fall protection had to be used MATERIALS/PROCESSES: » After concrete cured, substrate was blasted » Applied Belzona 4911 TX conditioner primer by hand » Applied Belzona 4111 Magma Quartz at an average of ¼-inch (6.35 mm) thickness in one pass SAFETY CONSIDERATIONS: » Used gloves, hard hats, and protective clothing when applying coating » Wore fall protection and harnesses when working on scaffolding » Used hydrogen sulfide gas monitors to be sure air was safe

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