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Pipeline Corrosion Assessment

Pipeline Corrosion Assessment

Benefits
Atteris performed a probabilistic corrosion assessment utilising historical pipeline operating and inspection data to determine the likely corrosion condition of a gas pipeline. This assessment assured the operator of the pipeline’s integrity for the period up to the next planned in-line inspection.
Background
The pipeline was dewatered and dehydrated following flooding with treated seawater during modification work. An in-line inspection was performed as part of dewatering operations. A subsequent inspection three years later determined that internal and external corrosion had occurred. A standard corrosion assessment using inspection data only was performed by a third-party and had concluded that the pipeline would have unacceptable corrosion within 5 years.
Work Performed by Atteris

Atteris applied its practical and unique approach to corrosion assessments by using inspection and historical operating data as key input variables to present a more credible corrosion model for internal corrosion of the pipeline. The assessment incorporated key variables such as pressure, temperature, flowrates and moisture content. This assessment approach assured the operator of the pipeline’s integrity in the period until the next in-line inspection, thereby allowing the operator to continue operating the pipeline in the interim period.

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