What is one consequence of allowing scale to build up in the boiler?

Allowing scale to build up in a boiler can significantly hinder its safe and effective operation, leading to an increased risk of overheating and potential boiler failure. Scale consists of mineral deposits that accumulate on the heat transfer surfaces, insulating the metal from the hot gases and reducing the efficiency of heat transfer. This insulation can lead to the metal overheating as the heat cannot effectively dissipate through the scale. Overheating can compromise the structural integrity of the boiler, potentially resulting in failures such as cracks or bursts, which can lead to dangerous conditions, including explosions. Therefore, managing and preventing scale accumulation is crucial for maintaining the boiler's safety and performance.