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The minimum corrosion requirements for an underground container, as outlined in the NFPA 58 code, dictate that the container must be protected or coated to prevent corrosion. This is critical because underground containers are exposed to soil and moisture that can lead to corrosive reactions. A protective coating or an appropriate protective system serves as a barrier against these environmental factors, thereby extending the life of the container and ensuring safety.
Coating systems can include various materials designed specifically to resist corrosion, such as epoxy coatings or other protective finishes. This requirement is based on safety standards that recognize the risks associated with corrosion, which may lead to leaks and compromise the integrity of the LPG system.
The other options provided either do not meet the necessary safety standards or are not sufficient to prevent corrosion. For instance, an uncoated and exposed container would be at high risk of deterioration, while painting alone may not provide the comprehensive protection needed against the specific corrosive elements found underground. Galvanization has its merits but does not address all potential corrosion concerns as effectively as a robust protective coating system designed for this purpose.