Technician I Corrosion Training Practice Test

When a CP-protected pipeline shows a sudden increase in corrosion rate, the priority is to diagnose and restore the protective balance rather than ignore the issue or take drastic actions. The best course is to verify the protection system and the pipeline condition: measure CP potentials and the current output to confirm the system is delivering the intended level of protection; look for stray currents or interference from other electrical sources that can drive currents onto or off the line; inspect the coating for holidays, damage, or disbondment that expose bare metal and alter current distribution; and then adjust the CP system as needed to bring the potentials back into the protection range and ensure the coating remains effectively isolated. These steps address the common causes of a rise in corrosion rate under CP—insufficient or misapplied current, external electrical interference, and coating defects—so correcting the system and conditions should restore protection.