What does "scaling" refer to in relation to boiler operation?

Scaling in boiler operation refers to the accumulation of mineral deposits on heating surfaces. This typically occurs when water evaporates, leaving behind dissolved minerals such as calcium, magnesium, and silica. Over time, these minerals build up and form a hard layer on the surfaces where heat is transferred, which can significantly affect the boiler's efficiency and performance.

The presence of scale reduces heat transfer efficiency, leading to increased fuel consumption, overheating of metal components, and potentially causing boiler failures. Regular maintenance and water treatment processes are implemented to minimize scaling and ensure optimal boiler operation.

In contrast, cleaning boiler components is a separate maintenance activity aimed at removing any buildup or deposits, and it does not define scaling. Mechanical wear of joints pertains to physical deterioration due to movement and stress, rather than accumulation of deposits. Periodic inspection of pressure levels is related to safety checks of the boiler's operational parameters, which, while important, does not directly pertain to the concept of scaling on heating surfaces.