How long do anodes placed in a water storage tank for cathodic protection usually last?

Anodes used for cathodic protection in water storage tanks play a critical role in preventing corrosion of metal components by employing galvanic action. The expected lifespan of these anodes can vary based on several factors including water chemistry, temperature, flow rate, and the specific type of anode material used.

Typically, anodes are designed to last a significant duration, and when we consider the average lifespan of well-maintained anodes under optimal conditions, they can indeed last around 20 years. This extended lifespan makes them a cost-effective solution for long-term protection against corrosion, reducing the need for frequent replacements and maintenance.

In contrast, the other options represent shorter lifespans that may be typical for less optimal conditions or different types of anodes, but they do not account for the ideal conditions where properly installed and maintained anodes can provide long-lasting protection.