Cases of corrosion damage caused by improper sealing of metal pipes

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Examples of corrosion damage caused by improper sealing of metal pipes: In production facilities, some pipes need to pass through the floor. To prevent sewage from flowing down through the openings, a water barrier should be placed around them, but this cannot completely stop sewage and debris from falling in. Some operators seal the annular gap between the pipeline and the water baffle with foam insulation material. During subsequent maintenance, it was found that the surface of the carbon steel pipes in the areas sealed with foam material had suffered severe corrosion, while the corrosion level in the rest of the pipes was normal. Comment: Foam insulation materials create sealed areas on the pipe surface, trapping water vapor and thereby intensifying corrosion conditions, leading to accelerated corrosion of carbon steel pipes. If it is a stainless steel pipe, when the foam material contains chlorides, this may lead to chloride concentration and thereby cause stress corrosion cracking, resulting in pipe damage.