If a plastic pipeline segment has a gouge or scratch deeper than what percentage of the pipe wall, it must be repaired?

The correct answer is based on the established standards for maintaining the integrity of plastic pipelines. If a gouge or scratch penetrates deeper than 10% of the pipe wall, it is considered a significant defect that could compromise the structural integrity of the pipeline.

This percentage is crucial because it serves as a threshold that helps identify potential weak points in the pipeline where stress or pressure could lead to failure during operation. Maintaining the pipe's structural integrity is paramount in ensuring safety, efficiency, and longevity of the distribution system. By requiring repairs for gouges or scratches deeper than 10%, the standards ensure that any potential risks associated with defects are addressed before they lead to more serious issues, like leaks or ruptures.

Lower percentages, such as 5% or less, may be considered acceptable under certain conditions, while thresholds of 15% or 20% imply significant degradation that could already endanger the pipeline's performance before action is taken. Thus, the 10% mark serves as a balanced guideline for preventative maintenance in the industry.