An Examination of Surface Morphology and In-Situ Study on ASTM A106-Gr.B ‘CUI’ Piping in EDC Plant
Journal Title: International Journal of engineering Research and Applications - Year 2017, Vol 7, Issue 8
Abstract
Corrosion under Insulation (CUI) is one form of degradation on process piping and pressure vessels that occurs underneath insulation as a result of condensed steam that has been trapped in to the insulation due to the temperature dissimilarity between the barriers. The water may come from seasonal, leakage through overheads, deluge system, wash water, or sweating from temperature cycling or low temperature operation such as refrigeration units. Unfortunately, because the corrosion is hidden under the insulation, CUI tends to remain undetected until the insulation is removed for inspection or when leak occurs. CUI is a common and also severe problem across many industries including refinery, petrochemical, fertilizer and power plant, onshore & offshore industries. The root cause of CUI is very simple that the interface between the pipe insulation and the substrate to which the insulation is applied there is a temperature differential. Regardless of how tight a pipe insulation material is wrapped around, or applied to, the substrate there is a space where the temperature makes a quick change from higher to lower and that causes a release of moisture and sweating commonly referred to as condensation which leads for the cause of superficial rust formation. CUI is in the form of localized wall loss on carbon steel and 300 series stainless steel. On carbon steel, it‟s evident as localized thickness loss. With the stainless pipes, it is often pitting corrosion and induced stress corrosion cracking (ISCC). Proper wrapping of insulation and providing barricading novel surfactant through Cathodic Protection (CP) are the main sources to control CUI failures.
Authors and Affiliations
A. C. Mariappan, A. Ramesh
Keywords
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