[1] It is an important quality measurement of crude oil.
The TAN value indicates to the crude oil refinery the potential of corrosion problems.
It is usually the naphthenic acids in the crude oil that cause corrosion problems.
TAN values may also be useful in other industries where oils are used as lubricants to determine oxidation and the subsequent corrosion risk to machinery.
[1] TAN value can be deduced by various methods, including