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Carbon steel storage tanks are used for containing non-corrosive powdery materials, industrial concentrated sulfuric acid, industrial caustic soda, neutral water solutions, oil substances, etc., and are now widely used in various industries such as sanitation, chemicals, and food.
Storage Tank Types: Vertical, Horizontal, Flat-end, Elliptical-end, Round, Square, Conical, Flat-bottomed, Round-bottomed, Sloped-bottom, and Conical-bottom styles.
Regarding carbon steel storage tanks for storing concentrated sulfuric acid:
At certain temperatures, the corrosion rate of carbon steel by dilute sulfuric acid increases with concentration, but after reaching a certain concentration, the corrosion rate sharply decreases with further concentration increases. For concentrated sulfuric acid with a concentration above 80% and a temperature below 60°C, carbon steel and cast iron exhibit good corrosion resistance, but it is not suitable for flowing sulfuric acid. Flow rates exceeding 0.67 m/s can cause turbulent corrosion, particularly at the inlets and outlets of pipelines.
2. Sulfuric acid with a concentration greater than 70% can cause passivation when it comes into contact with iron, oxidizing the steel surface to form an oxide layer. Due to the low water content in concentrated sulfuric acid, there are no free ions. This oxide layer will not be further oxidized and corroded. Therefore, carbon steel tanks are perfectly suitable; however, a certain amount of corrosion allowance should be left.
3. Due to the hygroscopic nature of concentrated sulfuric acid, it is crucial to prevent moisture when storing it in carbon steel tanks. You can add desiccants to the tank's breathing line, and nitrogen blanketing can be applied to large carbon steel tanks to isolate moisture.
