What additional advantage does crude oil washing have compared to water washing?

Crude oil washing offers a significant advantage over water washing due to the solvent action of the splashing crude oil. When crude oil is used for washing, it can effectively dissolve and dislodge residues and contaminants that may adhere to the tank surfaces. This capability arises from the chemical properties of crude oil, which allow it to interact more favorably with certain types of viscous residues and hydrocarbon-based dirt found in the tanks.

Water washing, while effective in many situations, primarily relies on the force of water to dislodge particulate matter. It may not be as effective against stubborn residues, particularly those that are oily or have similar characteristics to the washing medium itself. Crude oil washing, with its solvent properties, enhances the cleaning process by not only removing solids but also emulsifying and breaking down heavier residues, leading to a more thorough clean.

This advantage is particularly valuable in the maintenance of tankers, as it can expedite the cleaning process and improve the overall efficiency of cargo handling operations.