Cathodic protection systems utilize electric currents to safeguard metallic structures from corrosion. It's crucial to comprehend the safety and regulatory aspects associated with these systems and effectively manage electrical safety risks.
For proper installation, it is essential that individuals handling cathodic protection systems undergo appropriate training. If you seek more information, contact the Australasian Corrosion Association.
These systems are governed by Part 13 of the Electrical Safety Regulation 2013. According to this Regulation, all cathodic protection systems capable of delivering a current greater than 0.25A must be registered.
What is a Cathodic Protection System?Cathodic protection devices shield submerged and underground metallic structures, such as ships, pipelines, and tanks, from corrosion. They use electric current or an electrically dissimilar metal to counteract the effects of corrosion.
Two types of cathodic protection systems include:
- Passive galvanic system: Utilizes a zinc coating or a separate zinc anode to protect a steel surface through sacrificial corrosion.
- Impressed current system: Connects the structure to a direct current source to reverse or redirect the electrochemical reaction, providing more comprehensive protection.
Risks Associated with Cathodic Protection Systems:
- The systems may be situated in hazardous environments, posing an increased risk of fire or explosion.
- Improperly installed systems can cause damage to structures or nearby buildings.
- In aquatic environments, malfunctioning systems may create electrical hazards despite the low voltage.
- Systems spanning several kilometers may present risks from remote lightning strikes.
Regulations and Registration Requirements:Specialized technical knowledge is essential for the safe installation and maintenance of cathodic protection systems. The Electrical Safety Regulation 2013 outlines requirements for their installation, design, operation, testing, and registration.
Certain systems are exempt from the Regulation, including fishing equipment, systems on floating mobile structures, and specific offshore structures or internal surfaces covered by the Australian Standard AS2832.4 Cathodic protection of metals – Internal surfaces.