How many seconds of flame exposure will cause an external fuel tank at 10% load to rupture?

How many seconds of flame exposure will cause an external fuel tank at 10% load to rupture?

• A. 28 seconds
• B. 3.5 minutes
• C. 5 minutes
• D. 20 seconds

Answer: (A)

The correct answer indicates that an external fuel tank filled to 10% of its capacity will rupture after approximately 28 seconds of flame exposure. This is based on the thermal characteristics and structural integrity of the materials used in the construction of the fuel tank. When exposed to flames, the heat transfer causes the tank material to weaken over time. At a 10% fuel load, the tank is less stable than when filled to higher levels because the greater volume of vaporized fuel can create increased pressure and lead to a rupture. The sequence of events under flame exposure typically involves initial heating, followed by a point where the tank material can no longer withstand the thermal stress, leading to a failure or rupture. The other options suggest longer durations of exposure, which do not align with empirical data regarding the time it takes for the tank integrity to fail at a low fuel level. Therefore, selecting the time frame of 28 seconds accurately reflects the critical limits of material failure when subjected to significant thermal stress in a fire scenario.

The correct answer indicates that an external fuel tank filled to 10% of its capacity will rupture after approximately 28 seconds of flame exposure. This is based on the thermal characteristics and structural integrity of the materials used in the construction of the fuel tank.

When exposed to flames, the heat transfer causes the tank material to weaken over time. At a 10% fuel load, the tank is less stable than when filled to higher levels because the greater volume of vaporized fuel can create increased pressure and lead to a rupture. The sequence of events under flame exposure typically involves initial heating, followed by a point where the tank material can no longer withstand the thermal stress, leading to a failure or rupture.

The other options suggest longer durations of exposure, which do not align with empirical data regarding the time it takes for the tank integrity to fail at a low fuel level. Therefore, selecting the time frame of 28 seconds accurately reflects the critical limits of material failure when subjected to significant thermal stress in a fire scenario.