Which component is typically used to safely contain oil spills onboard a tanker?

The slop tank is specifically designed to safely contain oil spills and any oily water mixtures that may accumulate on board a tanker. It serves as a temporary storage solution for surplus oil, washing water, or any residues that cannot be immediately processed or disposed of. This segregation is vital for maintaining safety and environmental compliance, as it prevents pollutants from entering the sea in case of an emergency or accidental discharge.

Unlike the ballast tank, which is used to maintain stability and balance of the vessel, and the inert gas tank, which holds the inert gas used for reducing the flammability of vapors in cargo tanks, the slop tank's primary function revolves around managing waste and ensuring oily substances are contained safely until proper disposal can be arranged. The fuel oil tank is dedicated to storing fuel necessary for the operation of the ship, not for managing spills. Therefore, the slop tank is the appropriate and designated component for dealing with oil spills on tankers.