Pay attention to small details to prevent pipeline corrosion
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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.
The plug made contact with the metal surface, and electrochemical underscale corrosion occurred under the influence of water vapor and the plug.
Is the outer surface of the pipe unpainted?
The outer surface of the pipe does have a protective layer, but severe corrosion has indeed occurred under such operating conditions. This incident tells us that we must pay close attention to the details of such structures and ensure proper anti-corrosion treatment for the pipes.
Can it be understood then that the foam at the location where the pipe passes through the compartment is causing water to accumulate there, as if it’s submerged in water? In other words, the foam wasn’t sealed properly, so water seeped in. The foam surface isn’t smooth; it’s a bit bumpy, and the water can’t flow away from there So, making this area a conical inclined surface from now on would be better, right, to improve the quality? How to consider thermal expansion and contraction? There will be gaps.
Yes, that’s exactly the reason.