Bacterial contamination of large circulating oil systems in steam turbines, paper machines and similar systems is a growing and expensive problem. The bacterial colonies, once established, will clog control systems, quickly degrade oil quality and oil performance, and produce corrosive byproducts. If not detected early, the problem will manifest itself into expensive repairs, extended downtime, and a significant expenditure of scarce resources. As the United States steam turbine fleet ages and maintenance intervals are stretched, the problem is growing. Since steam turbines generate approximately 60% of the United States' electrical power demand, the potential problem is significant. This paper presents a brief description of circulating oil bacterial contamination, operational risks, problem recognition, types of lubricants and conditions that appear to be most susceptible, methods of treatment, and known methods to clean up and prevent bacterial contamination. A brief case history is also included.
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