ABSTRACT
Corrosion mitigation aims at controlling the rate and/or distribution of corrosion to a level that is economically justifiable in the context of pipeline planned life, whilst minimising human and environmental risks. The chapter deals with the methods, approaches and procedures in mitigating both internal and external corrosion in pipelines. It describes the implementation methods and outlines the merits of each technique and their specific requirements. Oxygen removal is a typical method for mitigating corrosion in water injection systems. There are two main types of scavenging chemicals used for corrosion control – these are oxygen scavengers and hydrogen sulphide scavengers. Multi-component chemicals such as those used for hydrotesting or production fluids should be evaluated for their efficacy. Cathodic protection is used to mitigate external corrosion on buried or submarine pipelines. The chapter outlines the pipeline corrosion management (PCM) targets as an integrated part of the overall PCM programme.
