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inline inspection (ILI)

A method used to assess the the integrity and condition of pipelines. It involves the use of specialized tools that are inserted into the pipeline and propelled by the flow of product or an external energy source. The tool is equipped with various sensors, such as ultrasonic sensors, which collect data about the interior surfaces, dimensions (wall thickness), and potential defects such as corrosion, cracks, weld integrity, and other anomalies. This data is later analyzed to evaluate the structural integrity, identify potential areas of concern or damage, and determine the need for maintenance or repairs.

Inline inspections play a crucial role in ensuring the safety, reliability, and operational efficiency of pipelines and other enclosed systems. By detecting and assessing defects and anomalies, it helps operators identify potential risks, prevent leaks, optimize maintenance programs, and extend the lifespan of assets.

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NOTE 1 Also known as pigging.

NOTE 2 See also inline inspection tool.