CoatingsPro Magazine Supplements

STEEL 2019

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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8 STEEL SURFACES 2019 COATINGSPROMAG.COM "Equipment on most jobsites consists of many different types of PPE," said Induron's Rowland. "You have pieces that are common to almost all construction projects, such as hard hats, boots, fall protection, and eye and ear protection. With coatings, one of your primary pieces of PPE will be a respira- tor. A respirator is essential, especially in confined spaces." Companies such as 3M, Bullard, MSA Safety, and Guardian Fall Protection are among PPE specialists. Needs can also var y by phase. " With traditional dr y abrasive blasting, we recommend full-face shields, heav y coveralls, gloves, a breathing apparatus, and work boots to protect you from debris," said Belzona's Nisill. "It should be conducted in an appropriate enclosed space w ith filtration and air movement, because it w ill create dust and debris. With wet abrasive blasting or hydroblasting, it's pretty much the same equipment, but those tend to be outdoors more." He also sug gests disposable coveralls as preferable options to reusable ones when possible to avoid potential exposure. Ty vek by DuPont is an option in this area. For coating work, PPE needs often depend on the products and jobsite. "With our products, it depends more on location," Nisill explained. "If you're doing an external coating job, we generally don't require a breathing appara- tus. If spraying, we always recommend a mask and face shield, because it could be carried toward you. With brush- ing products, you do want to protect your eyes and skin, but if you're outdoors, it typically doesn't require a breathing apparatus because it's not airborne." For jobs that are indoors or in enclosed spaces, such as a tank, the PPE selection may hinge on air flow. But if in doubt, err on the side of caution! "If you're unsure, wear the mask," Nisill said. "You're not going to be wearing it for that long, so it's better to be safe than sorry." e height of a jobsite may warrant extra consideration. If access is difficult, companies such as BrandSafway and Safespan are among the providers of scaffolding and platform systems to enable access to hard-to-reach aerial locations. A containment apparatus might also be needed to limit exposure to nearby areas. Testing and Instrumentation Another upfront consideration should be testing and instru- mentation. W hile these products can be used throughout a project, experts say contractors should be diligent in using them as early as possible. "Validation testing should be done enduring the surface preparation and coating application," said Bruce Toews, global market director for oil and gas at Sherwin-Williams Protective & Marine Coatings. "You can do nondestructive testing, a Barcol hardness test and MEK [methyl ethyl ketone] double rubs for linings, and dry film thickness [DFT] readings. But you can't effectively analyze the quality if you start at the end. We want to look at the beginning and during the project so we don't have to do as much verification afterward." "If you wait until you're wrapping up a project and you want to start [testing], you might as well unpack everything because you're going to have a lot of repairs," added Kevin Morris, global market director at Sherwin-Williams. "e QA [quality assurance] and QC [quality control] process should start before the project begins. ings like wet film thickness [WFT] gages should be used to guarantee that you're achiev- ing the specifications so that when you get to that final stage, you don't have a lot of rework to get to specifications. At the tail end of the process, you may be doing some DFT and holiday testing for interior linings." Induron's Rowland concurred regarding the use of a DFT gage. "Most often, what gets used is a dry film gage to ensure the product was applied to the recommended thickness," he said. "You want to verify that the paint film is not too thin or too thick. As far as an objective, quantitative metric, it's often this dry film reading that we're looking at to show that the coating has been applied per the job specification." According to Belzona's Nisill, having a wet coating too thin would dry and expose the blast profile. "It's not just a 'one set of instructions fits all.' It needs to be tailored to each applica- tion and tailored to the product," he said. Elcometer offers its Ultra/Scan coating thickness probe as part of an extensive line of inspection equipment, while DeFelsko and the Paul N. Gardner Co. (Gardco) offer products including the PosiTector 6000 III series of coating thick- nesses gages for metal substrates, as well as the PosiTest Pull-Off Adhesion Tester to measure the hydraulic force required to pull a coating away from its substrate. For extra assistance, Morris advises the use of an independent coatings inspector certified by organizations such as NACE International. "A lot of people say it's expen- sive, but compared to a failure due to something being done incorrectly, it's a cheap insurance policy," he said. Steely Resolve continued on page 10 Throughout the project, testing is usually done, such as for adhesion and coating thickness. The Paul N. Gardner Co. (Gardo) distributes several toolsin this area, such as the PosiTector 6000. Steely Resolve

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