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The paper presents an extensive case study on the application of NACE International, Internal Corrosion Direct Assessment (ICDA)Standard Practices for 22 oil & gas production and transport pipelines owned by two pipeline operators in India. The objective of the paper is to discuss the advantages, the challenges, and the limitations of using an ICDA approach as an integrity validation tool, based on the experience of having performed all 4 steps for every ICDA on the subject twenty-two pipelines. ICDA can be used as an integrity validation tool for both non-piggableand piggablepipelines with no interruption to operations, toidentify the root-cause of internal corrosion, and to provide recommendations formonitoring and mitigation options. However, as discussed in the paper, the success of the ICDA depends on a number of factors including, but not limited to, the availability of comprehensive historical operational data for the pipelines, understanding thelimitations of the Internal Corrosion Prediction Model used, access to prioritized Detailed Examination sites, use of proper NDE tools and training to detect internal corrosion anomalies, and educating the pipeline operators on the requirements and limitations of the ICDA standard practices.
Keywords: internal corrosion, direct assessment, integrity validation, non-piggable pipelines
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The pipeline is the Gibraltar-Bucaramanga Gas Pipeline which is divided in two electrically isolated sections by the use of a monolithic joint. The study concluded that it was necessary to complete additional actions to guarantee pipeline integrity, and to assure low corrosion rates.