Anti-corrosion coating system for the inner wall of crude oil tanks – middle section of the tank’s inner wall

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In the past, this area was also coated with an oil-resistant, antistatic coating, but in recent years painting is generally no longer applied, leaving it bare. Due to the time interval between the completion of tank construction and the filling with oil, which can be as long as over a year, corrosion occurs rapidly in that area. In marine atmospheric conditions, how much thickness can bare steel lose due to corrosion in one year? The data for low-carbon steel given in ISO12944-2 is 80-200um/year 1 (C5-M). The reason for not applying paint is that thick oils such as crude oil can adhere to the surface and provide rust protection. I have never seen the condition of this part of a tank that has contained oil; I have seen ones that haven’t had oil in them for over a year, and they were quite severely rusted. As for how to paint here, it should be with an oil-resistant, antistatic coating; it can be applied in a thin layer. Using a petroleum resin varnish that is soluble in crude oil to provide rust protection before filling with oil should also work.