Pipelines and other carbon steel assets that are exposed to water, mixed phases, or water-laden hydrocarbons are highly susceptible to microbiologically influenced corrosion (MIC). This process, caused by either direct or indirect attack of metallic iron by microorganisms, causes costly damage to carbon steel assets and, in some cases, failure of the asset altogether resulting in loss of primary containment. One approach to reduce and/or mitigate the negative impact of MIC is the implementation of an effective biocide treatment strategy.
In laboratory studies, the impact of multiple biocides and treatment strategies on MIC were evaluated. Several commonly used biocides were applied under anoxic flowing conditions to sessile organisms enriched from anoxic North Sea sediment. This benchmarking study involved both the application of biocides to reduce biofilm formation on clean carbon steel and the application of biocide to established biofilm. The impact of biocide choice and mode of application on effective microbial control and corrosion management in these studies will be discussed.
Key words: MIC, Microbiologically influenced corrosion, biocorrosion, flow loop, biocide