How can overfill protection be ensured in a fuel oil tank?

Ensuring overfill protection in a fuel oil tank is crucial for safety and environmental protection. Limiting the fill to a set percentage is a practical method for preventing overfilling. By capping the fill level, operators can create a buffer space within the tank, which accounts for temperature fluctuations and liquid expansion that may occur. This strategy minimizes the risk of accidental overfilling, which can lead to spills and leaks.

Utilizing this approach effectively requires systems or procedures that allow for accurate measurement of the tank's fill level, ensuring that the fill percentage adheres to the preset limit. This method aligns with best practices in storage tank management and is often required by regulations to maintain safe operating conditions.

Other options, while potentially beneficial in managing tank levels, may not provide the same level of proactive prevention against overfilling. Continuous monitoring alone does not guarantee that a fill event won't exceed safe levels; it primarily serves as an oversight. Filling a tank to its maximum capacity inherently risks overfilling if not closely monitored. A manual fill system places greater reliance on personnel, which can introduce human error into the process. Therefore, limiting fill to a set percentage is the most effective strategy for ensuring overfill protection.