August 2011, Vol. 238 No. 8

Features

Advances In ILI Allow Assessing Unpiggable Pipelines

Advances in inline inspection (ILI) tools and other inspection technology today allow for detailed assessment of unpiggable or difficult-to-pig pipelines. In pipe systems considered unpiggable or difficult-to-pig, hydrotesting has been the primary fitness-for-service (FFS) assessment methodology. While regulatory compliance may be achieved by hydrotesting some lines, such testing does not provide a complete picture of the condition of a pipeline. Inline inspection (ILI) now allows operators to gather a large amount of inspection data about systems on which they previously were only able to obtain very little or incomplete information. In addition to collecting information, the

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