CoatingsPro Magazine

MAY 2017

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 68 of 84

68 MAY 2017 COATINGSPROMAG.COM Due to visual observations, the client approved destructive testing. All substrates, including stacks, supports, and tanks, were tested. The Inspection Must Go On e destructive testing was completed per ASTM D5402: Standard Practice for Assessing the Solvent Resistance of Organic Coatings Using Solvent Rubs. We used the double-solvent rub test on the organic coatings using Methyl Ethyl Ketone. We also used a paint inspec- tion gage (PIG) for the evaluation of the multiple coating systems as well as scribing to remove tightly adherent coatings. e scribing was completed in 1-foot by 1-foot (0.3 m x 0.3 m) areas using a razor blade, 3-pound (1,360.8 g) hammer, and poly plastic to catch the paint chips, which were sent off to a laboratory for further analysis. A l l str uctures were tested, such as t wo 17-stor y boi ler str uctures, t wo 15 -stor y Absorber str uctures, stacks, pipes and suppor ts, conveyer rack str uctures, limestone shelters, coa l shelters, and tanks. A f ter testing a l l str uctures using the A STM D5402 method for organic coatings, we found that a l l areas fai led af ter t wo to f ive r ubs. ese coatings had been applied over two years prior to testing per the ASTM D5402 standard. e results from the PIG tests were compelling: Many areas that were coated were not primed with inorganic zinc silicate as the specification called for but were primed with epoxy and polyurethane. Additionally, the dry film thickness readings were either too high or too low, and no areas were consistent. It is essential not only for inorganic zinc silicate to be applied for the galvanic protection of the steel structure, especially in this harsh environment, but it should also be applied in the proper thickness range. We also started gathering delam- inated paint chips at various locations in the plant and started removing paint that was tightly adherent to the structures to send to a laboratory for analysis. Once the lab investigated all of the paint chips, the lab concurred with our findings. Power Plant Coatings Add Life to Your Project with Fiber Reinforced Linings. The FibreCreteâ„¢ family of polymer linings delivers a corrosion-resistant barrier with lower permeability than alternative flake-filled products. Spray application makes it much less labor intensive than matte systems thereby minimizing downtime and expense. FibreCreteâ„¢ is ideal for preserving secondary containment, ducts, stacks and process vessels where chemical exposure and physical demands are extreme. Call Sauereisen for lower permeability, greater flexural strength and longer life. 412-963-0303 160 Gamma Drive, Pittsburgh, PA 15238 Email: F IBRE C RETE TM Wr i te in Re ad e r In q u ir y #170

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