What is a key safety feature required for all underground storage tanks handling flammable liquids?

Emergency shut-off valves are essential safety features for underground storage tanks storing flammable liquids. These valves serve a critical purpose by allowing operators to quickly stop the flow of liquid in the event of a leak or spill, significantly reducing the risk of fire or explosion and minimizing environmental damage. Such valves can be activated manually or automatically, ensuring a rapid response to hazardous situations.

While regular maintenance checks are important for overall tank integrity and safety, they do not provide immediate action to mitigate accidents at the moment they occur. Visual inspections are useful for identifying visible issues, but they lack the capability to swiftly terminate dangerous conditions. Sensor alarms play a vital role in monitoring for leaks or hazardous levels of flammable materials, but they require a response from personnel to act. In contrast, emergency shut-off valves offer a direct and immediate solution for preventing disasters. Their presence is a proactive measure that addresses the potential risks associated with storing flammable liquids in underground tanks.