What is a cathodic protection in storage tanks?
Cathodic protection is a corrosion control technique used to protect underground metallic structures from corrosion and increase their lifespan. Adequate cathodic protection is achieved by shifting the potential of the buried structure to a certain criteria, -850 mv with respect to a Cu/CuSO4 reference electrode.
Why is cathodic protection of tanks?
The common means of supplementing the coating system is to install a cathodic protection system inside the storage tank. Cathodic protection provides electrical current to those areas not isolated from the environment by virtue of being coated, and therefore stops the corrosion cycle.
Does cathodic protection work above ground?
Cathodic protection (CP) is typically applied to all above ground storage tanks built on a ring wall foundation to protect the external tank bottom in contact with the soil/sand foundation. Smaller tanks built on concrete slab foundations typically do not have cathodic protection applied to them.
What is a 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.
Which can be used for cathodic protection?
The simplest method to apply cathodic protection is by connecting the metal to be protected with another more easily corroded metal to act as the anode. Zinc, aluminium and magnesium are the metals commonly used as anodes.
What is the principle of cathodic protection?
The principle of cathodic protection is to connect an external anode to the metal to be protected and to pass a DC current between them so that the metal becomes cathodic and does not corrode.
What are types of cathodic protection?
The Two Types of Cathodic Protection Systems
- Galvanic cathodic protection system. A galvanic cathodic protection system works by utilizing sacrificial anodes.
- Impressed current cathodic protection system.
- Which system do you need?
Is corrosion protection needed for steel tanks?
All metal UST system components that are in contact with the ground and routinely contain product must be protected from corrosion. Tank and piping made of steel having a corrosion-resistant coating and having cathodic protection.
What is required to protect a steel tank from corrosion?
a. Steel tanks can be coated with a corrosion resistant coating and “cathodically’ protected. Cathodic protection reverses the electric current that causes corrosion and comes in two forms: (1) “Sacrificial anodes” can be attached to the UST.
How does ‘cathodic protection’ process work?
Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell . A simple method of protection connects the metal to be protected to a more easily corroded “sacrificial metal” to act as the anode. The sacrificial metal then corrodes instead of the protected metal.
What is the cathodic protection program?
Cathodic Protection Program. A critical component of corrosion mitigation , cathodic protection is an electrochemical process to control the corrosion of a metal surface by transferring the corrosion from the protected structure to a more easily corroded metal.
How can cathodic protection prevent corrosion?
Cathodic protection (CP) is a means to prevent corrosion by applying a flow of electrical current from an external source (anode) through the environment and on to the metallic structure that is being protected. This protective current changes the environment around the metal thus halting the corrosion reaction.
Why do cables need cathodic protection?
Cathodic protection is a defense against the corrosion of metal. For the cable and wire industry, this means ensuring the copper wire does not break down or fault. Corrosion in our industry comes from many different factors: