What condition triggers the safety feature of a boiler to operate?

The safety feature of a boiler is designed to prevent dangerous situations, and one of the most critical conditions that triggers this feature is exceeding the maximum allowable working pressure. This pressure limit is established to ensure that the boiler operates safely within its design specifications. When the pressure exceeds this limit, it poses a significant risk of rupture or explosion due to the excessive energy contained in the steam or water inside the boiler.

The safety mechanisms, such as pressure relief valves, are activated to release excess pressure and protect both the equipment and personnel. This ensures that the boiler can safely return to operational conditions without any risk of catastrophic failure.

While other conditions like low fuel supply or high water temperature can also affect boiler operation, they typically do not trigger safety mechanisms in the same direct and immediate way that an overpressure condition does. Insufficient air supply primarily affects combustion efficiency rather than directly triggering a safety feature.