What method is commonly used to reduce oxygen levels in a fuel storage tank?

The method commonly used to reduce oxygen levels in a fuel storage tank is nitrogen blanketing. This process involves displacing the air in the tank with nitrogen gas, which is an inert gas and does not support combustion. By filling the headspace of a tank with nitrogen, the concentration of oxygen is lowered, thus minimizing the risk of fire or explosion, as well as reducing the potential for oxidation and degradation of the fuel.

Nitrogen blanketing also aids in maintaining the quality of the fuel by preventing contaminants from entering the tank and reducing the formation of harmful compounds that can occur when oxygen is present. This practice is essential in fuel storage management, as it helps ensure the safety and longevity of the stored fuel.