What should be done if there is a high current density on a bare foreign line?

When there is a high current density on a bare foreign line, it indicates an increased risk of localized corrosion, which can severely compromise the integrity of the pipeline. High current density suggests that there is a greater flow of electrical current over a particular area, which can accelerate corrosion processes, particularly in spots that are not adequately protected or insulated.

Addressing localized corrosion is crucial because it helps mitigate the potential for more extensive damage. By identifying and treating areas where corrosion is occurring, operators can prolong the lifespan of the pipeline and maintain its safety and functionality. This often involves applying protective coatings, using corrosion inhibitors, or implementing cathodic protection systems tailored to the needs of the specific section of the line that is affected.

Monitoring closely is also an important practice, however, it is primarily a reactive approach where the focus is on observation rather than taking immediate action to address the identified high current density. Similarly, increasing insulation or implementing explains tests could be measures taken to prevent further issues, but they do not directly address the immediate problem caused by localized corrosion.

Thus, the most effective response to high current density is to address localized corrosion to protect the integrity of the pipeline effectively.