SELECTING A PROTECTIVE COATING SYSTEM FOR THE TANK INTERIOR SURFACE

Abstract

The article is devoted to the study of the properties of various paint and varnish coatings to ensure optimal protection of the surface of tanks from destruction. The inner surface of the tanks is subject to corrosion due to being in constant contact with an aggressive medium. The greatest danger, from the point of view of possible corrosion destruction of steel, is represented by water (bottom, lower belts of the tank) and gas-air mixture (roof, upper belt) due to saturation with aggressive components: hydrogen sulfide, carbonic acid gas, salt. Failure statistics show that the main reason for the failure of oil reservoirs (about 70%) is corrosive wear of the surface that comes into contact with an aggressive medium. To eliminate this disadvantage, there are a number of methods, including the use of corrosionresistant materials, the use of corrosion inhibitors, surface passivation, and the application of corrosion-resistant coatings. The use of corrosion-resistant materials is economically ineffective and is associated with difficulties in the installation of the tank. The use of inhibitors requires additional costs for their subsequent extraction. The positive experience of using paint and varnish coatings is widely known. The aim of the work is to determine the optimal type of protective coating to prevent corrosion on the inner surface of the tank. To select the paint and varnish coating of the inner surface of the tank, the following tasks were solved: the physical and mechanical parameters were determined and the corrosion rate of the tank walls for the selected paint and varnish coatings were calculated. The use of corrosion-resistant protective materials for the inner surface of the tank bottom is proposed.