What is a common safety feature of each supply line in a fuel storage system?

A thermally acute shutoff valve is a critical safety feature in a fuel storage system because it is designed to automatically close the fuel supply line in response to high temperatures. This function helps prevent potential hazards such as fires or explosions that could occur if the fuel were to spill or evaporate in excessive heat. By reacting to temperature changes, the shutoff valve ensures that fuel is contained safely, reducing the risk of a catastrophic incident.

In contrast, while features like an emergency shutoff switch, pressure gauge monitoring, and a weekly inspection log may also enhance safety and operational integrity, they serve different primary purposes. An emergency shutoff switch allows for immediate manual control in an emergency situation, whereas pressure gauge monitoring helps to maintain correct operational pressures and detect leaks. A weekly inspection log is a procedure for documenting safety checks but does not actively prevent incidents like a thermally acute shutoff valve does. Therefore, the thermally acute shutoff valve stands out as a proactive mechanism specifically designed to respond to thermal hazards in the context of fuel storage.