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STEEL 2019

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18 STEEL SURFACES 2019 COATINGSPROMAG.COM the performance," said Sherwin-Williams' Morris. He noted that the water business has seen a slow transition to ultra-high solids products and elastomeric polyurethanes. "In the oil and gas space, when you look at the cost differ- ences, if you upgrade to the polysiloxanes or even the fluoro- polymers, especially on larger projects, the cost difference to the owner is essentially zero," added Sherwin-Williams' Toews. "Our testing shows that you will you get significant extended life cycles by doing that, and the owners are start- ing to look at this." A related consideration is thicker film builds. For example, Induron specializes in epoxies with a ceramic pigment such as its Perma Clean 100 Ceramic Epoxy. "Ceramic, which is an inert pigment that varies in size by three orders of magnitude, imparts some qualities not often found in more commonly used pigments," said Induron's Rowland. "Using ceramic pigments that are light in weight, we are able to build thick paint films that resist sagging. It makes a highly impermeable film where any migration of moisture has to weave its way through these ceramic spheres. e alkaline nature of the pigment also imparts anti-micro- bial properties to the film." Rowland said the coating can build films of anywhere from 25 to 50 mils (635.0–1,270.0 microns) in one coat. "If we can achieve high films in one coat of labor, we're sometimes cutting out an additional one to two coats required to achieve the desired film build, and that's a significant cost savings to contractors and owners. Oftentimes, we can go direct to metal with these coatings without the need for primers." For Belzona, which offers repair composites and coatings such as its two-part, spray-friendly Belzona 1331 epoxy for continuous immersion conditions up to 122 °F (50 °C), Nisill said the selection should incorporate both desired technical features and be suitable for the specific end use. "We factor in what stresses get applied, so we want to know if [the asset] is subject to impact, abrasion, pedestrian traffic, vehicular traffic, or any other details we could receive. en the last one we look at is temperature. What's the normal operating temperature, and what is the minimum and maximum? e normal could call for one coating, but if every week they send the coating to an elevated temperature for [some] time, we may need to pick a coating that is more suitable for the elevated temperatures." Other potential steel coating manufacturers, such as for ships and other vessels, are Carboline, Hempel, and PPG Industries. en there are specialty coatings, including passive fire protection materials; nanocoatings; insulative coatings, such as Tnemec's Series 971 Aerolon Acrylic, which uses aerogel particles that impart insulative properties to control condensation; and National Science Foundation (NSF) 61-rated coatings for potable water. For roofing, Tnemec's Series 1070 Fluoronar is recom- mended as a high-solids fluoropolymer coating providing an ultra-durable finish. National Coatings Corp. and Mascoat are separate suppliers of metal roof coatings. Some steel substrates may also need minor patches and repairs. For this purpose, A lvin Products supplies metal repair and patching compounds under its Lab-metal line. Meanwhile, Denso North America offers products including its Protal 7125 and Protal 7200 repair cartridges, along with PALIMEX protective tapes for pipes and station construction. e cartridges are formulated for patching and repairing liquid-coated pipelines and cadweld areas, while the tapes are used on buried steel and cast-iron pipes. As part of its corro- sion prevention line, Denso also supplies products such as protective wraps, sealing, and molding. Spray, Brush, or Roll? Once a coating is selected, the choice of how to apply it often hinges on the product's technology and what's feasible at the jobsite. "In the oil and gas market, we find that spray is the application method of choice whenever possible," said Sherwin-Williams' Toews. "But inside a refinery or chemical plant, application by spray is normally not allowed. You're limited to brush and roll application inside of plants." With linings, Toews said recent advances in coating and lining technologies are enabling an increased use of airless systems without having to use plural-component equipment. Cost considerations may play a role. "A lot of people would ask whether they get anything extra out of [spraying] based on the cost of setting up containment," said Sherwin- Williams' Morris. "Do you save enough to set up contain- ment? Brush and roll might not get the same thickness as spraying, and you may need an extra coat if you're brushing and rolling." Similarly, the cost from the client keeping an asset out of service could be factored in, since different appli- cation methods work at different speeds. "It's more relevant to the structure being coated," Morris Specialty coatings — such as passive fire proofing (PFP) products; insulative coatings from Tnemec, for example; and nanocoatings — may need to be spray, brush, or roll applied depending on the materials and jobsite location. Steely Resolve continued from page 15 Steely Resolve

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