Traditionally, closed system treatment programs have involved adding corrosion inhibitor and periodically testing for the residual. However, to be effective, these treatment programs must also include cleaning (either prior to being put into service or to remove existing corrosion products) as well as monitoring. The systems being protected are generally of very high value and a comprehensive program, which assesses everything from pre-commissioning to ongoing performance, must be considered. This paper will discuss the various aspects that should be evaluated as part of a closed system treatment program.

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