What is the purpose of coating the outer surface of lined container equipment with color-changing paint?
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The picture below shows two vessels (blue) of a petrochemical catalytic device. The inner walls are thermal insulation and wear-resistant linings, and the outer surfaces are coated with color-changing paint. What does it do?
Let me take a guess, is this paint a temperature-sensitive material, and if the lining is damaged, can it be detected in time based on the color change?
Yes, it is a temperature-indicating paint. Whenever there is a problem with the lining layer, such as cracks, etc., the temperature of the metal surface changes and the paint changes color, indicating that there is a problem with the lining.
Even if you don't use this temperature-changing paint, regular weekly closed-light inspections can still detect existing internal defects! The addition only makes it easier to judge and analyze!
Hot spots can also be checked using an infrared thermal imager
That surface temperature may be too high.