What are the two main types of corrosion protection on upgraded steel tanks?

The primary focus of corrosion protection for upgraded steel tanks is on minimizing the effects of corrosion that can compromise the integrity and safety of the tanks. Cathodic protection and internal lining are both effective methods employed to safeguard against corrosion.

Cathodic protection works by applying a small electric current to the tank, which helps to counteract the electrochemical processes that cause corrosion. This method is particularly effective for steel tanks because it prevents the steel from losing electrons and, consequently, prevents rust formation.

Internal lining serves as a barrier between the corrosive substances stored within the tank and the tank's structural steel. This can be a specialized coating that protects the steel from corrosive liquids and vapors, significantly extending the lifespan of the tank and enhancing its usability.

Collectively, these two methods—cathodic protection and internal lining—form a comprehensive approach to corrosion management, ensuring that upgraded steel tanks maintain their structural integrity in the long term. The other options do not encompass the primary methods recognized for corrosion protection in upgraded steel tanks, which is why they are less relevant in this context.