Intent 1:
To remove tanks from the application of Sentence 4.3.1.2.(1) if the tanks are designed and constructed to limit
the probability of the escape of liquid and vapour, but only if there
is a situation of:
- possible contamination of the liquid being stored from
contact of the liquid or its vapour with the tank, or
- possible rapid deterioration of the tank from contact
with the liquid being stored or its vapour, which could lead to the
premature failure of the tank and the escape of its contents.