Which of the following is a sign of damage when inspecting steel pipes?

Pitting is a critical indicator of damage in steel pipes. This phenomenon involves the formation of small, localized areas of corrosion that can create holes or cavities in the pipe's surface. Pitting typically arises from factors like the presence of moisture, electrolytic action, or the chemical composition of the environment surrounding the steel. Unlike other forms of corrosion that may uniformly affect a surface, pitting is particularly dangerous because it can lead to significant structural weaknesses while remaining visually minimal, making it more challenging to detect until severe damage has already occurred.

Recognizing pitting damage is essential for maintaining the integrity and safety of the piping system, as it can compromise pressure retention and lead to leaks or failure if not addressed promptly. Understanding this type of damage is crucial for professionals working in maintenance and repair within the industry, as it informs their decisions regarding whether a pipe can be repaired or if it needs replacement.