Corrosion is the disintegration of an engineered material into its constituent atoms due to chemical reactions with its surroundings. Common methods used to control corrosion on pipelines are protective coatings and linings, cathodic protection, materials selection and inhibitors. Unprotected pipelines, whether buried in the ground, exposed to the atmosphere, or submerged in water, are susceptible to corrosion. Without proper maintenance, every pipeline system will eventually deteriorate. Corrosion is an ongoing, dynamic process. The keys to effective corrosion control of pipelines are quality design and installation of equipment, use of proper technologies, and ongoing maintenance and monitoring by trained professionals.