Final answer:
Liquid oxygen (LOX) storage tanks should be purged every 12 months to ensure safety and prevent accidents related to oxygen's reactivity with flammable materials.
Step-by-step explanation:
In order to understand how often liquid oxygen (LOX) storage tanks should be purged, it is important to recognize that oxygen is highly reactive and can cause explosions when in contact with flammable materials. The purging process involves removing any potential contaminants from the tank to prevent accidents. The frequency of purging depends on various factors, including the specific application and safety regulations.
Based on industry standards and guidelines, liquid oxygen storage tanks should typically be purged every 6 to 12 months. However, it is crucial to consult the manufacturer's recommendations and adhere to any specific regulations or guidelines in your jurisdiction.
Therefore, the correct answer to the question is B) 12 months.