When should the interior of steel water storage tanks be examined if they do not have corrosion protection?

The recommended practice for examining the interior of steel water storage tanks that do not have corrosion protection is to conduct these inspections annually. This frequency is essential because steel tanks are susceptible to corrosion and degradation over time, particularly if they are exposed to water and moisture without any protective coatings.

Annual inspections allow for the timely identification of any corrosion, leaks, or structural integrity issues before they can develop into more significant problems. This proactive approach is crucial for maintaining the safety and reliability of the water storage system, as well as ensuring compliance with health and safety standards. Additionally, examining the tank interior on an annual basis enables the operator to take corrective actions as necessary, thereby extending the tank's lifespan and improving overall water quality.

In contrast, less frequent inspections, such as every two, quarterly, or five years, may not adequately address the risk of corrosion and its consequences, potentially leading to costly repairs or failure in the system.