Associate Safety Professional Practice Exam

What is the most economical way to protect an elevated water tank from the damaging effects of corrosion?

1. Galvanization

2. Epoxy coating

3. Cathodic protection

4. Regular painting

The correct answer is: Cathodic protection

To determine the most economical way to protect an elevated water tank from corrosion, understanding the principles behind each method is essential. Cathodic protection is a widely accepted method used to prevent corrosion, particularly in metal structures exposed to moisture. This technique involves using sacrificial anodes or impressed current to create a protective electrical charge around the metal surface, effectively shielding it from corrosive elements. While galvanization provides a sacrificial layer of zinc that can prevent corrosion for a time, it may not be the most cost-effective long-term solution, especially if the initial cost of galvanization is high. Epoxy coatings create a barrier against moisture and chemicals, but they require careful application and maintenance, which can lead to increased costs over time. Regular painting can offer some level of protection, but it generally requires frequent reapplication and maintenance, which can be more expensive in the long run compared to cathodic protection. This method can provide ongoing, effective protection without the need for frequent repairs or upkeep, making it a more economical choice in the context of long-term maintenance and operational efficiency for an elevated water tank.