At what intervals should the interior of steel tanks with no corrosion protection be inspected?

The correct choice indicates that the interior of steel tanks with no corrosion protection should be inspected every 3 years. This frequency is established to ensure that any potential corrosion or deterioration can be detected and addressed before it leads to more significant structural issues or leaks. Steel tanks, especially those exposed to moisture or other corrosive elements, are at risk of developing rust and corrosion over time. Regular inspections at this interval help establish a routine maintenance schedule that contributes to the longevity of the tank and ensures safety and compliance with regulations.

Choosing a longer inspection interval might increase the risk of undetected damage, while more frequent inspections, such as annually or bi-annually, may not be feasible or necessary for every facility. Balancing the need for precaution with practicality is essential in maintenance planning for such structures.