Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

What role does cathodic protection play in maintaining elevated storage tanks?

1. Improves tank aesthetics

2. Protects against corrosion

3. Reduces water temperature

4. Enhances water pressure

The correct answer is: Protects against corrosion

Cathodic protection is a critical method used to prevent corrosion in metal structures, including elevated storage tanks. It works by using electrochemical processes to protect the tank's material, generally steel, from oxidation, which is the primary cause of corrosion. By applying this system, a more anodic material is used as a sacrificial anode or an impressed current can be applied, effectively diverting the corrosion process away from the tank wall. This process is especially crucial for elevated storage tanks, as they are often exposed to environmental elements like moisture and atmospheric conditions that can accelerate corrosion. Without effective corrosion protection, the integrity of the tank could be compromised, leading to leaks or structural failure. Therefore, cathodic protection directly contributes to the longevity and reliability of these storage systems by maintaining their physical integrity, and enhancing the overall safety of the water supply. Improving tank aesthetics, reducing water temperature, and enhancing water pressure are not functions or benefits of cathodic protection. These aspects relate more to the design and operation of the water storage system rather than its structural maintenance.