Which statement is TRUE concerning insulating flanges?

The correct statement regarding insulating flanges is that they should be inspected and tested periodically to ensure that the insulation is clean and in good condition. Insulating flanges are critical components used in piping systems to electrically isolate sections of the pipeline. This isolation helps prevent galvanic corrosion by breaking the electrical continuity between dissimilar metals. Periodic inspection and testing are essential to ensure that the insulating material remains intact and effective, as dirt, moisture, or degradation can compromise their function. Regular checks help maintain the integrity of the system and ensure safety and efficiency.

Other options suggest practices that are not appropriate for managing insulating flanges. For instance, substituting the deactivation of a cathodic protection system for using insulating flanges is incorrect since it could lead to corrosion. The resistance value after installation should actually be above a specified threshold to ensure effective insulation, contrary to the suggestion of being less than 1,000 ohms. Lastly, performing hot work on deck after an insulating flange is installed could pose risks, as the presence of flammable materials and the potential for electrical concerns make it dangerous without proper precautions in place.