Anti-corrosion coating system for the inner wall of crude oil tanks – inner surface of the floating tank
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It may be because the corrosion on the inner surface of the floating tank is mild, and no relevant standards mention this aspect. However, based on some examples of tank construction, the commonly used coatings for this area include the following: 1. Epoxy coal tar anti-corrosion coating, which was widely used in early tank constructions ； It is characterized by low cost, but it is hardly used these days. 2. Epoxy primer + epoxy intermediate coat. Usually the same as the epoxy primer and intermediate coat used for the outer wall of the tank ； 3. Water-based inorganic zinc-rich primer 4. Water-based epoxy anti-corrosion coating 5. Solvent-free epoxy anti-corrosion coating. The coating thickness is usually between 100-200 microns. These days, it is common to paint the sheets before welding, and then drill holes for repairs after they have been shaped and installed. For repair coatings, I think solvent-free epoxy is the most suitable option, and the reason is simply the enclosed environment.
Although the inner surface of the floating tank is not severely corroded, it is still painted for protection in practical applications. Commonly used coatings include epoxy coal tar pitch (used in the past but now largely phased out), epoxy primer + topcoat, water-based inorganic zinc-rich primers, water-based epoxy coatings, and solvent-free epoxy coatings. The coating thickness is generally between 100 and 200 microns. The common practice nowadays is to paint the sheet metal before welding, and then send someone into the tank to make repairs after it has been assembled. For repairs in a sealed floating compartment, solvent-free epoxy coatings are highly recommended, as they are safe and convenient. .