Outdoor storage tanks for flammable or combustible liquids shall be kept at least ___ feet from a building.

• A. 20
• B. 50
• C. 60
• D. 300

Answer: (A)

The important idea is to create a safe buffer between outdoor tanks that hold flammable or combustible liquids and nearby buildings. Keeping at least 20 feet away reduces the chance that heat, flames, or vapor from the tank could reach and ignite the building, and it also gives space for responders to access the tank if a fire occurs. This 20‑ft distance is a common minimum for smaller, outdoor storage; when tanks are larger or contain more hazardous liquids, codes typically require greater clearances (such as 50 or more feet). Always check the current fire code and NFPA tables for the exact requirement based on tank size and liquid class.