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 90 of 116

90 JANUARY 2018 COATINGSPROMAG.COM Science Behind It Containment System By Israel Landaverde, Foreman at Blastco, a TF Warren Company C ontainment is used to keep contaminants, such as spent abrasives and paint, from exiting the jobsite into the surrounding atmosphere as well as keep other contaminants, such as dirt and debris, from entering the jobsite environment. On the Four Points tank project, the main point of the containment was to ensure that the residents in the area were not exposed to any of the project materials. Taking precautions, such as building the containment, helps to keep people out of harm's way. Every asset is a little different, and even more so, every tank is unique, which means that not all containment is created equally. It requires attention to detail with regard to both creation and removal. Determining the Size To deter mine the containment needed on the Four Points tank, Blastco, a TF War ren company, f irst had to deter - mine the size of the space that needed to be contained. Severa l d imensions are needed for this: the height and rad ius of the tank and the d istance the containment needed to be f rom the tank. is tank was 150 feet (45.7 m) tall, and the diameter was around 74 feet (22.6 m). e containment needed to run down the tank within 3.5 and 4 feet (1.1‒1.2 m) from the perimeter. Keeping a minimal distance between the tank and the containment helps to give integrity to the structure and prevent the containment from collapsing. Installing the Containment With everything ordered new and onsite, it was time to build the containment "wall " around the tank. e sheets of tarp that we used on this project were from Eagle Industries. ey were standard sizes at 50 feet (15.2 m) wide by 75 feet (22.9 m) long, and they were made of tightly woven nylon fabric with a silicone coating. is creates a Society for Protective Coatings (SSPC) Class 1A containment, which means that it's made of impermeable materials and is attached to a structure installed on the tank. Containments are hung from the bottom up, meaning they're placed around the ground around the tank and then winched up to the top. We used a 6-ton (5,443.1 kg) air-pow- ered winch to do that here. e winch system was installed by a welding crew, made up of two welders, to complete the task. e system included rigging boots and pulleys. e rigging boots were installed around the perimeter of the tank. On this project, there were a total of 54 outriggers installed. en, to build the contain- ment tree, the pulleys were welded around the center of the tank. e pulleys were used to run the cables to the top of the tank to allow the crew to winch the container to the top. e tarps were connected with big rings for the bonnet, which is the tarping that goes on the top of the tank, and industrial zip ties, vertically connecting the strips of fabric along the sides. On this job, we used a total of about 3,000 ties. On the initial winch up the tank, the crew stopped at certain points that are reachable to bind the remaining tarps together. Once the containment was hung, it was anchored into the ground. is ensured that elements, such as rain and wind, didn't rip the containment off of the tank, and it also helped to keep the tarp from hitting any coatings that might have still been curing. W hen there are high winds, though, the containment is dropped as quickly and safely as possible. Once up, the containment is secured with ground anchors that are installed every 4 feet (1.2 m). is tank needed a total of 54 ground anchors. e 1-inch (2.5 cm) diameter anchors were drilled into the ground 5 feet (1.5 m) deep. Normally, the crew drills the anchors with a Bobcat and an attachment, but on this job, because of the limestone in the ground, we had to bring in a drilling truck. Concrete was poured into the drills to secure the anchors. Taking It Down W hat goes up must come down. For this tank containment, that occurred on a daily basis. e containment was winched up in the morning, and then it was lowered down at the end of the last shift as a part of standard operating proce- dures. At the end of the project, after the crew dropped this containment for the last time, it was disassembled and taken to a project nearby. CP

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