What is the minimum percentage of the highest operating level for a tank test following delivery?

The minimum percentage of the highest operating level for conducting a tank test following delivery is 10%. This standard is essential to ensure that the tank has sufficient fuel volume to facilitate accurate testing while also accounting for any potential design or operational issues that may not manifest if the tank is underfilled. By maintaining this minimum volume, technicians can check for leaks, structural integrity, and ensure proper operation of the tank's systems without the risk of inaccuracies that can result from insufficient fuel levels. This requirement aligns with safety protocols and operational best practices in tank management.