Materials Performance

NOV 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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15 MATERIALS PERFORMANCE: VOL. 57, NO. 11 NOVEMBER 2018 Information on corrosion control and prevention The manufacturing process for the composite insert. Photo courtesy of Belzona. The completed composite insert. Photo courtesy of Belzona. The finished product after the application of a ceramic epoxy coating for abrasion resistance. Photo courtesy of Belzona. suitable ceramic-f illed epoxy coating, Belzona 1321 † (Ceramic S-Metal), to pro- vide long-term erosion protection in a f luid f low environment. The next step was to bond the insert into the actual pipe. For that application, the surface was grit blasted using an angu- lar abrasive to a near-white metal finish (e.g., NACE No. 2/SSPC-SP 10, "Near-White Metal Blast Cleaning" 3 ). The surface was dry with all contaminants removed. After grit blasting, a paste-grade material was applied as an adhesive between the sleeve and the pipe at a max- imum thickness of 10 mm. Named Bel- zona 1161 † , the material is a solvent-free, surface-tolerant epoxy resin reinforced with silicon steel alloy for metal bonding, repair, and resurfacing. It can be mixed and applied without the need for special- ist tools, the manufacturer explains, and will adhere to wet or oily surfaces due to its surface tolerance. The cold-applied polymeric systems, which do not require hot works, present feasible alternatives to welding repairs for various reasons. Welding often requires post-weld heat treatment, which in some instances may result in the loss of weld metal strength and toughness. Even if the strength is maintained, extensive downtime is often required, as are specialized tools for the applicator or maintenance crew. On the other hand, the manufacturer says its focus on restoring rather than replacing helps reduce downtime to a minimum, simplif ies the installation pro- cess, and optimizes operational eff iciency for clients such as the nuclear power sta- tion in France. "Replacement was not an option, and the client was extremely happy with the solution," Frederic says. Source: Belzona, www.belzona.com. Contact Marina Silva, Belzona Polymerics, Ltd.—email: msilva@belzona.com. References 1 ISO 24817:2017, "Petroleum, petrochemical and natural gas industries—Composite re- pairs for pipework—Qualification and de- sign, installation, testing, and inspection" (Geneva, Switzerland: ISO, 2017). 2 ASME PCC-2, "Repair of Pressure Equipment and Piping" (New York, NY: ASME, 2015). 3 NACE No. 2/SSPC-SP 10, "Near-White Metal Blast Cleaning" (Houston, TX: NACE Inter- national). —Ben DuBose

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