How can tool marks on boiler tubes be identified?

The identification of tool marks on boiler tubes is primarily focused on their unique characteristics, which are distinct from other forms of damage or wear. Tool marks are created during machining or maintenance processes and typically do not resemble corrosion effects. Corrosion usually presents as surface degradation with irregular patterns and a lack of consistent definition, while tool marks are often more defined and systematic, indicating a physical alteration from tools rather than chemical or environmental factors.

In contrast, markings caused by corrosion often result from moisture, chemical reactions, or prolonged exposure to extreme conditions, leading to a more generalized and uneven appearance. Tool marks can be recognized by their linear features, which stand out in comparison to the pitted or discolored characteristics of corrosion.

This distinction is critical for maintenance personnel and engineers, as identifying tool marks accurately helps assess the integrity of the boiler tubes and prevent misdiagnosing the cause of wear or failure. Understanding these differences aids in better decision-making regarding repairs and maintenance protocols.