The assessment of unpiggable pipelines, and the decision whether to conduct external wall thickness checks, depends on the available data of how the pipeline has been operated. Lack of information, or information indicating that moderate to significant corrosion has taken place, drives the requirement to further investigate the condition by conducting external wall thickness checks. Ultimately, investing a little up front on monitoring and mitigation measures could save significant cost in the longer term by not having to perform these, often costly, inspections.
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