What is the maximum capacity percentage that overfill alerts should not exceed?

The maximum capacity percentage that overfill alerts should not exceed is 90%. This standard is designed to ensure safety in the handling of underground storage tanks (USTs). At 90% capacity, the tank has enough space to accommodate the expansion of the stored product due to temperature fluctuations, minimizing the risk of overflow.

Maintaining the tank below this threshold is crucial because it allows for emergency procedures to be executed effectively in case of accidental overfilling or unexpected delivery. Additionally, operating at this percentage helps to reduce the potential for environmental contamination, which can occur if spills happen during the filling process when tanks are too full.

By implementing alerts at 90%, operators ensure they are complying with regulations and taking the necessary steps to protect both the environment and public safety. This level aligns with best practices in the industry, reflecting a proactive approach to tank management.