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A visual inspection of a subsea field development, transporting wet gas, containing approximately 1.5 to 2 mol% of CO2 to shore, was conducted via ROV (remotely operated vehicle). The pipeline system is largely carbon steel with only short lengths of CRA (corrosion resistant alloy) piping from the wellhead to the production/pigging manifold. Downstream of the pigging manifold the system has 20” carbon steel spools leading to the FTA (flowline termination assembly) and then 20” carbon steel flowlines to the riser platform.
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Protection of steel exposed to high temperature areas, in particular those which are insulated, provides some of the most demanding situations faced by coatings. Systems applied in these areas are required not only to give resistance to high operating temperatures (which are often cyclic) but also provide corrosion protection.
Extensive guidelines have been published for selecting where to search for corrosion under insulation (CUI). The guidelines are based on CUI failures and near misses. Piping CUI inspection programs collect the data outlined as relevant in specific company practices.
保温和防火材料下的腐蚀控制系统方法的推荐做法
DOWNLOADABLE HISTORICAL DOCUMENT. Current technology and practices for mitigating corrosion under thermal insulation and fireproofing materials.
In the late part of the 1980’s, the inventor worked with the reflective coating companies that made “NASA ceramic paints”. During this time that he worked with the reflective companies, he learned that the formulas used for reflective paints were not made from NASA technology and were only good for light reflection. When the coatings became dirty or tarnished, the coatings did not reflect heat.
Corrosion under thermal insulations namely CUI (Corrosion under insulation) is among the key degradations posing integrity risks to the hydrocarbon processing, chemical, and petrochemical facilities. CUI is reportedly known as the reason behind 40-60% of failures in the piping for the oil refineries. Whereas the small-bore piping (i.e., NPS< 4”) is more prone to this damage mechanism where reportedly where up to 81% of failure result from CUI.
Corrosion Under Insulation (CUI) is a well-known industrial problem that has been plaguing asset owners for decades. CUI presents one of the costliest corrosion factors for Oil and Gas, petrochemical and general processing industries and can result in unplanned shutdowns, maintenance, repairs or even explosions while in service. Due to the risk factors present, many methods to prevent CUI have been adopted, trying to find best practices to minimize the risk of potentially catastrophic events caused by CUI.