Preservation of petroleum quality and control of microbiologically influenced corrosion (MIC) in storage tanks pipelines and deadlegs are critical issues in the petroleum production industry. A model tank/deadleg system has been developed and used to evaluate biocide efficacy in controlling microbiological growth and MIC in these systems. The model system employs a glass tank reactor containing a dodecane/aqueous phase solution in combination with a 12-position modified Robbins device which serves as the deadleg. The Robbins device includes an integral electrode system to enable continuous corrosion monitoring. In tests using an oilfield consortia of sulfate-reducing acid-producing and general heterotrophic bacteria a long-acting biocide has been shown to effectively control growth of planktonic and sessile bacteria both in the tank and the deadleg segment. The biocide was able to maintain greater than a four-log reduction in viable bacteria while substantially reducing the risk of MIC on carbon steel surfaces. KEYWORDS: Biocide biofilm corrosion MIC storage tank deadleg pipeline electrochemical oilfield consortia Robbins device