What percentage of the diameter of a steel underground tank must the burial depth meet to provide adequate restraint under normal conditions?

To ensure that a steel underground tank is properly restrained and able to withstand external pressures under normal conditions, the burial depth must meet at least 60% of the tank's diameter. This percentage is significant because it helps counteract the buoyancy forces that can occur, especially in areas with high groundwater levels. Adequate restraining of the tank is crucial to prevent it from floating, shifting, or being damaged due to soil movement or water table fluctuations.

When the depth of burial meets this criterion, the external soil pressure provides sufficient weight and stability to keep the tank in place, minimizing the risk of structural failures or leaks that could lead to environmental hazards. Understanding the relationship between a tank's diameter and its burial depth is essential for proper installation and compliance with safety regulations in the context of underground storage.