Which safety feature is designed to prevent overpressure situations in gas systems?

The feature designed to prevent overpressure situations in gas systems is the excess flow valve. This device functions by automatically closing or restricting flow if the gas flow exceeds a predetermined level, which could indicate a potential leak or abrupt increase in pressure. By limiting excess gas flow, the excess flow valve helps to maintain safe operational pressure within the piping system, effectively mitigating the risk of overpressure and potential hazards associated with it.

Gas detector systems are crucial for identifying leaks or hazardous concentrations of gas, but they do not directly control or contain flow; rather, they serve to alert personnel to unsafe conditions. General ventilation systems and exhaust fans are instrumental in maintaining air quality and removing potentially harmful gases but do not specifically address overpressure situations in the gas delivery system itself. Therefore, while these other options contribute to overall safety and risk management in gas systems, the excess flow valve is specifically designed to address and prevent overpressure.