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There are several design factors that need to be considered when specifying coatings in water and wastewater concrete structures. Issues include treating surfaces with exposed aggregate, with a low pH, and exposed reinforcing steel. This paper will present three examples of important design considerations based on field experiences that can avert lining performance problems and impacts on a project schedule or budget. Specific examples from a number of projects will be used to illustrate these design considerations.
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Procedures for repairing existing lining systems that are deteriorating. Cleaning, surface preparation, priming & top coating. Thin, thick and extra thick film linings. Substrates of steel, nonferrous metals, metallizing, concrete, masonry, tile & wood.Historical Document 1991
In case of Off-shore platforms there are operated for more than 25 years in severely corrosive environment. It is necessary to keep high quality coating performance for long-term operation period without maintenance.The performance of a coating is significantly influenced by its ability to adhere properly to the substrate material and steel preparation is the essential first stage treatment of a substrate before the application of any coating.With regard to steel preparation ISO 8501-3 specifies preparation grade of welds edges and other area with surface imperfection. The interpretation of preparation grade vary with depending on requirement level of client because it is visual assessment standard not quantitative.To study the effect of surface imperfection affecting long-term durability of coating performance on offshore coating system the carbon steel surface was prepared by different preparation grade based on ISO 8501-3 type of imperfection about weld profile weld porosity and thermally cut edge.This study will look at the correlation between surface imperfection and coating performance on the basis of NORSOK M-501 and ISO 20340 test method including ageing resistance and sea water immersion test for 6 months.Keywords: Off-shore platform ISO 8501-3 surface imperfection weld profile weld porosity thermally cut edge NORSOK M-501 ISO 20340 ageing resistance sea water immersion
The data produced in this study indicates that there are differences between the ICRI CSP comparator panels and TACM CSP comparator panels. Further, there are differences between taking direct measurements from known surfaces (i.e., the ICRI and TACM CSP panels) and obtaining indirect measurements from an epoxy putty casting of those same known surfaces. Therefore, it is important that the specifier indicate which method is to be used when qualitative or quantitative methods are invoked in the contract documents.
Coating and Lining of Concrete requires an understanding of both new and existing concrete substrate conditions. New concrete must be evaluated for surface strength, cracking, and construction defects. In addition, existing concrete must be evaluated for mechanical damage, chemical contamination, and corrosion. Evaluation methods and equipment will be discussed.
A new water-soluble quaternary ammonium compound, didecyldimethylammonium bicarbonate/carbonate (DDABC), has been evaluated as a corrosion inhibitor via standard electrochemical tests on steel and shown to be highly effective. At the proper dilution, the inhibitor migrates to the metal/solution interface and forms a monomolecular film on the anodic sites.
Selection of coatings for concrete surfaces in nonimmersion and atmospheric services. Chemical properties. Surface preparation. Service conditions. General properties. Testing. Historical Document 1996
Appropriate inspection requirements to verify compliance to a specification. It is not intended to address the selection of a coating or to specify surface preparation and application requirements.
Describe el nivel de limpieza abrasiva que se llama "Metal Blanco". Metodos con aire comprimido (limpieza con chorro de arena o limpieza de la ráfaga) . Uno de cinco niveles: Metal Blanco, Metal Casi Blanco, Comercial, Industrial, Superficial
The objective of this study was to examine the effects of an ultra-high pressure (UHP) waterjetting surface preparation (>25,000 psi) on the performance properties of select marine/offshore coating epoxy systems. Uncoated steel panels had been allowed to rust in an outdoor atmospheric environment and then were subjected to UHP waterjetting