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COATINGSPRO SURFACE PREP 2018 17 blasting machine. Another flexible product is the Schmidt AmphiBlast from A xxiom Manufacturing, which combines proven controls with innovative moisture injection technology for an easy-to- use wet/dry air blast system. At the heart of the abrasive control system is the Schmidt ompson Valve II, which is capable of metering a wide range of coarse or fine abrasives. Using a patent-pending water flow control process, contrac- tors can quickly adjust and set the wet blast flow parameters while maintaining precise control over air, grit, and water flows to ensure efficient grit and water consumption. Besides the standard single outlet system, AmphiBlast also offers multiple blast outlet units to give users the unique flexible option of switching back and forth between wet blasting and dry blasting from the same equipment. Abrasive blasters are often used in tandem with blast pots, which hold the material to be distributed through the metering valve and into the compressed air stream before entering the blast hose. To that end, Marco offers an entire family of 20-ft.3 (0.6 m3) blast pots. "e Blastmaster abrasive blasting pots are pressure vessels used as part of an abrasive blasting system to deliver a mixture of abrasive and compressed air to a work surface," said Marketing Specialist Cody Lanning. " Typical applications include blast rooms, blast yards, bridges, oil refineries, pipelines, railcar shops, storage tanks, and water towers." Choosing Blast Media As mentioned earlier, selecting blast equipment is only part of the blasting equation. Another part is choosing the blast media. Abrasives Inc., Barton Industries, GMA Garnet, Sponge-Jet, and Winoa's W Abrasives are among the many suppliers of blast media that can be used in surface preparation. "Common abrasives used include aluminum oxide, crushed glass, garnet, mineral abrasives, slags, and steel shot and grit," said Marco's Lanning. According to Barton's Wolf, the critical factors that determine successful blasting are the magnitude and consis- tency of the resulting anchor pattern, the surface cleanli- ness, low salt levels to avoid premature coatings failures, and low dust levels. In response, Barton's garnet abrasives line addresses many of these concerns. "Our garnet line produces a super clean surface finish with a uniform profile that is virtually free of particle embed- ment," Wolf said. "It contains low levels of chlorides and other salts. Extensive environmental testing was conducted under real-world conditions, including dry blasting, and it was determined that when used as intended, Barton's garnet falls below the OSHA standard for respirable crystalline silica." For applicators, Wolf stressed proper particle size distri- bution as a priority. "Inconsistent abrasive grading results in rogue peaks and valleys in the anchor pattern, which can lead to out-of-spec coating thickness and the risk of premature improved worker safety, and flexible mounting options. BlastOne also offers its Ultra High Pressure Blaster as an alternative method when waterjetting is required. "Ultra- high-pressure [UHP] blasting is best used for the removal of heav y rust, scale, resins, chemical residues, and thick or abrasion-resistant coatings," Blackham said. "A UHP water- jet system cuts right through the rust or coating, rapidly disbonding it from the surface, and then rinses it away — stripping it down to a completely clean surface with its origi- nal surface profile." Other benefits include near dustless operation, thus ensuring regulatory compliance, and the removal of soluble salts and other invisible contaminants. Blastrac is another provider in this space. Blastrac's latest 1-8DM Shot Blaster features a new design for a highly portable, lightweight system. Ideal for smaller jobs, the 1-8DM runs on single-phase common power and greatly simplifies close-up work next to walls and other vertical protrusions. With manual travel speed and an 8.75-inch (22.2 cm) blast pattern, the small blast machine is ideal for tight spaces. e machine can be used as a complementary unit for larger jobs, and it can be used to prepare a variety of concrete substrates. e unit prepares, strips, cleans, and profiles in one step, and the profile provides a better surface for adhesion. For contractors needing maximum flexibility, the WetBlast FLEX from Clemco could be a viable option because it allows contractors to switch between wet and dry blast- ing with one piece of equipment. e FLEX is a portable system with a blast machine, water tank, and exclusive pump system to add water to the blast stream outside of the Succeed at Surface Prep Blasting may be wet or dry, and it may include various types of media. There are a variety of machines that offer blasters these options all in one piece of equipment. Axxiom is one.

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