Reduced maintenance costs and reduced hull repair bill ($$)
Extended vessel service life by approximately 7 years ($$)
Filling the ballast tanks with inert gas is the optimum way to abate insidious corrosion in ballast tanks of a double hulled vessel, because coatings and sacrificial anodes only partially work in certain conditions. Other factors:
A. Coatings and anodes do not work well to avoid corrosion when the ballast tanks are empty.
B. Addition of steel to compensate for corrosion would be unnecessary, as required by International Maritime Organization (IMO) and International Association of Classification Societies (IACS) guidelines for double hull tankers.
Pdf. File: A method to Mitigate Corrosion in ballast tanks of a double hull tanker – SNAME 2013