Under NFPA 407, when are tank-to-tank transfers prohibited?

• A. Only during scheduled maintenance
• B. Prohibited except in emergencies
• C. Allowed at all times
• D. Restricted to authorized personnel

Answer: (B)

Under NFPA 407, tank-to-tank transfers are prohibited except in emergencies to ensure safety and reduce the risk of incidents during operations. This standard is designed to mitigate potential hazards associated with the transfer of fuel and other volatile substances, especially in an airport environment where the risk of fire or explosion is a significant concern.

In normal operating conditions, transferring fuel between tanks could lead to spills, leaks, or unintended reactions that might compromise safety. Thus, this restriction emphasizes the importance of managing and minimizing risks associated with flammable materials, particularly in areas with high traffic and the presence of aircraft.

The provision for allowing such transfers only during emergencies serves to prioritize safety protocols and ensure that all necessary precautions are taken when handling hazardous materials. Authorized personnel must implement specific emergency procedures and have a clear understanding of the risks involved in these situations.