To override the limits in Sentence 4.6.2.1.(2) and permit more liquids in aboveground storage tanks on the basis that certain conditions are met.
This is to limit the probability that a fire involving the storage tanks will spread beyond the point of origin, which could lead to harm to persons.
To exempt the aboveground storage tanks from, and reduce the capacity limits of, Subsection 4.3.2. [as stated in Sentence 4.6.2.1.(1)].