What is the cathodic protection system?

Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathodic side of an electrochemical cell. Cathodic protection systems are used to protect a wide range of metallic structures in various environments. The most common applications include: Water and fuel pipelines.

How often must cathodic protection systems be recertified?

every three years
The cathodic protection system must be tested by a qualified cathodic protection tester within six months of installation and at least every three years thereafter.

Is cathodic protection AC or DC?

An impressed current cathodic protection system (ICCP) for a pipeline consists of a DC power source, often an AC powered transformer rectifier and an anode, or array of anodes buried in the ground (the anode groundbed). It is sometimes more economically viable to protect a pipeline using galvanic (sacrificial) anodes.

Where is cathodic protection used in the world?

Cathodic protection is often used to mitigate corrosion damage to active metal surfaces. Cathodic protection is used all over the globe to protect pipelines, water treatment plants, above and underwater storage tanks, ship and boat hulls, offshore production platforms, reinforcement bars in concrete structures and piers, and more.

What is the meaning of galvanic cathodic protection?

Galvanic cathodic protection is a protection of the metal surface of a piece of equipment using another metal that is more reactive. The latter metal usually called the galvanic or sacrificial anode which has a less negative electrochemical potential.

How does cathodic protection work in an electrolyte?

By placing an anode or anodes (external devices) in an electrolyte to create a circuit cathodic protection works and to the surface of the structure, current flows from the anode through the electrolyte. To stop further corrosion of the structure, corrosion moves to the anode.

Can you use cathodic protection on epoxy barrier?

While cathodic protection can work great on pipelines that have an epoxy barrier coat it has serious limitations for uncoated surfaces. Experts think of cathodic protection as secondary to the barrier coating. Test panels coated in EonCoat Weldable Coating being welded. With no damage to the coating.