Which safety feature prevents explosion hazards in a boiler?

The pressure relief valve is designed as a crucial safety feature in a boiler system to prevent explosion hazards. It automatically releases excess pressure that builds up within the boiler, thereby maintaining a safe operating pressure. If the pressure exceeds the predetermined limit set for the boiler, the relief valve opens, allowing steam or water to escape, thus averting the risk of a catastrophic failure or explosion.

This function is vital for ensuring the safe operation of the boiler, as excessive pressure can lead to severe damage and significant safety risks. In contrast, other options serve different purposes; for instance, a flame arrestor is used to prevent flames from traveling backward into the fuel supply line, while a water level indicator provides critical readings of the water level within the boiler. A combustion analyzer is utilized to ensure proper combustion efficiency and safety by analyzing flue gases. These devices contribute to the overall safety and efficiency of a boiler but do not directly prevent explosion hazards related to pressure buildup.