What methods can be used to inhibit corrosion in buried steel pipe?

Methods for controlling corrosion on buried steel pipes:

1. Cathodic protection (Protection is done by dielectric current which neutralizes the corrosion).
2. Coatings and linings (Providing proper coatings)
3. Corrosion inhibitors

Cathodic protection: It is used to control corrosion in the surface of metal. This method of protection is used in steel water pipelines, fuel pipelines, storage

tanks, and water heaters. In this method a metal that has been already protected gets connected to the easily corroded metal which acts as a anode. While doing so the easily corroded metal will gets completely corroded instead of corrosion of the protected metal. The metal which gets corroded is known as sacrificing metal.

Coatings and linings: Polyethylene and poly propylene coating are provided on the outer side of the pipe lines. Three layers of PE and PP coatings are used for heavy industries. Liquid Epoxy coating is preferred for water pipelines to protect it from corrosion. Use of graded epoxies the quality of water can be maintained.

Corrosion inhibitors: It is a chemical compound used with the addition of liquid inorder to decrease the corrosion. Fluid composition, flow regime and the quantity of water influences the effectiveness of the inhibitors. It is the process as same as the coating method.