What is a tubercle in the context of water corrosion?

In the context of water corrosion, a tubercle refers to a small protective crust of rust that forms on the surface of pipes and other metal components due to corrosion processes. This phenomenon typically occurs when localized corrosion takes place, leading to pitting or the development of small, protruding masses on the metal surface.

These tubercles can act as a barrier against further corrosion by isolating the underlying metal from water and other corrosive agents. However, they can also lead to reduced water flow and potentially other issues in the piping system over time. Understanding the formation and implications of tubercles is crucial for water operators, as it is essential to manage and mitigate corrosion to maintain the integrity of the water distribution system.