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COATINGSPRO SURFACEPREP 2015 17 Concrete and Steel Concrete and Steel continued on page 38 mar ine fabr ication, and repair. On t y pica l pipeline steel, it can achieve a near-white meta l c lean and a sur face prof i le rang ing f rom 2.5 to 3.3 mi l [64 – 8 4 microns]," said Lock ard of Montipower, Inc., the Nor th A mer ican and master d istr ibutor for the Br ist le Blaster. Blasting Steel: Many Options Many coatings industry experts view abrasive blasting as one of the best and fastest methods to obtain the correct surface preparation on steel surfaces, especially before applying high-performance coatings that require a near-white or white metal surface. W hen it comes to abrasive blasting steel, there are many diferent options for media-delivery systems as well as the actual media itself. According to Joe Craig of W heelabrator, both air blast and wheel blast technology prepare the substrate for coating by propelling abrasive at the surface to remove contami- nants and create a defned anchor profle. Air blast does this by pressurizing blast media in a blast tank and propelling it through one or multiple nozzles. W heel blast equipment uses centrifugal force to propel the abrasive and direct it at the surface in a controlled blast pattern. "Higher demands on coating quality have made blast cleaning much more preva- lent across industries. It reliably ensures that the surface before painting is free from rust and scale, which could form kernels for corrosion underneath the coating. We ofer both air blast and wheel blast equipment for the preparation of steel surfaces," said Craig. A xxiom also manufactures blasting equipment that can be used on steel substrates. Te RotoTeX X division of A xxiom has developed a new line of pipe blasting containment systems for surface preparation of small to large pipe diame- ters, in horizontal, vertical, or angled positions. It's All About the Media Tere are many types of abrasive media on the market today, and making the right choice for a specifc steel substrate coating job will depend, once again, on the condition of the steel and the requirements of the coating system that is to be applied. Barton International is a manufacturer and distributor of garnet abrasives. According to Scott Trom, "Carefully sized and graded abrasive provides a consistent anchor pattern that assures maximum adhesion while optimizing the use of expensive coating materials. Barton produces high-quality, high-performance mineral abrasives. Our primary product line is almandine garnet. Barton has also recently introduced a new cost-efective mineral abrasive called GTX." Tis blast abrasive is comprised of primarily hornblende, feldspar, and garnet, and as stated by Trom, "produces a consistent, smooth, white metal fnish." Sponge Media abrasives are another abrasive media option. According to Anni of Sponge-Jet, Sponge Media can achieve the same levels of surface cleanliness (as authored by SSPC-VIS 1 guide) and profle as an ordinary abrasive on metal substrates. "Sponge-Jet recently released GMA Garnet Sponge Media abrasive as well as the Sponge-Jet Feed Unit abrasive delivery system that include features that allow the blaster to precisely control the blast pressure and the air/abrasive concentration, which ultimately expands the capability to clean, decontaminate, selectively strip coatings, and/or profle to specifcation," said Anni. AGSCO is a distributer of surface preparation equip- ment and abrasives used in air and water blasting. Tey ofer a wide variety of abrasive media that is appropriate for steel, including steel shot and grit, which are made from waste scrap steel that is melted and reformed, and recycled glass When prepping surfaces, it is important that contractors consider the proper safety gear. Shown here is one of Clemco's supplied-air respirators used during the surface prep of a steel pipe. Various types of materials can be used for abrasive blasting, including garnet, glass, and sponge. Shown here is Sponge Media, which uses "high-quality abrasives with a synthetic sponge-like material," said Tony Anni of Sponge-Jet.

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