How to address metal surface corrosion under the insulation layer of petrochemical equipment?
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The images below show the metal corrosion that occurs beneath the insulation layers of heat exchanger equipment in the petrochemical industry. What effective protection methods can be used to prevent corrosion on the metal surface?
The following measures can be taken to prevent corrosion of the metal surface beneath the insulation layer of petrochemical equipment: 1. Add a moisture barrier: Install a moisture-proof or waterproof layer outside the insulation material, such as aluminum foil or plastic film, to prevent moisture from penetrating inside the insulation layer. 2. Use corrosion-resistant insulation materials: Choose insulation materials with better anti-corrosion properties, such as silicate insulation materials and polyurethane foam. 3. Surface coating protection: Apply anti-corrosion coatings to the metal surface, such as zinc-rich paints or epoxy resin coatings, to enhance its corrosion resistance. 4. Regular inspection and maintenance: Regularly check the condition of the insulation layers and metal surfaces of pipes and equipment, and promptly repair any damaged insulation or moisture-proof layers to ensure their integrity. Through these measures, corrosion of the metal surface beneath the insulation layer can be effectively prevented and reduced. .
At the maintenance site, it is extremely important to apply an anti-corrosion coating to the metal surface before restoring the insulation layer. It is generally not possible to achieve Sa2.5 grade rust removal by sandblasting for on-site anti-corrosion coatings. In such systems that require metal surface sandblasting before applying coatings, methods like epoxy-zinc-rich coatings do not yield good results. It is recommended to use a corrosion-resistant coating system with no fine surface treatment on the metal.