What are two safety features commonly designed for above-ground fuel storage tanks?

• A. Retainment dike or double wall allowing for 100-110% of tank capacity; painting tanks white for heat absorption
• B. Fiberglass construction
• C. Cathodic protection
• D. Automatic shutoff valves

Answer: (A)

Containment and heat management are the main safety ideas for above-ground fuel tanks. A retention dike or a double-walled tank provides secondary containment, designed to hold at least the full tank volume plus a little extra (often around 100–110% of capacity). This means that if the primary tank leaks or spills, the fuel is captured in the surrounding barrier, reducing environmental contamination and fire risk.

Painting the tank white helps limit heat buildup by reflecting sunlight, which keeps the contents cooler and reduces vapor generation and internal pressure. Cooler tanks are less prone to thermal stress and fuel vapor ignition, contributing to overall safety.

Other options don’t fit as universal safety features for above-ground storage: fiberglass construction is a material choice rather than a standard safety feature; cathodic protection is typically used for underground components to prevent corrosion; automatic shutoff valves are not a standard, universally applied safety feature for all above-ground tanks.