What kind of issues can excessive scaling lead to in a boiler?

Excessive scaling in a boiler primarily leads to reduced heat transfer and overheating. Scale develops as a result of mineral buildup from water, which can impair the efficiency of heat exchange processes. When scale accumulates on the heating surfaces, it acts as an insulating barrier, preventing efficient heat transfer from the combustion gases to the water. This inefficiency means that more fuel may be required to achieve the desired temperature and pressure, which can increase operating costs.

Furthermore, the presence of scale can lead to localized overheating of boiler components. Since the scale restricts heat transfer, the metal surfaces may reach higher temperatures than designed, potentially leading to metal failure, leaks, or even boiler shutdown. Hence, reducing heat transfer and overheating due to scaling represents a significant concern for boiler operation and maintenance, ultimately impacting safety and reliability.