There is no single crack defect detection size and depth target. It varies with application by the yield stress, pipe size, location and orientation on the pipe, and stress level. Material property variability, tool measurement error, class location and inspection reassessment intervals also need to be taken into consideration when developing crack defect detection criteria for inspection tools. The required sensitivity for low strength and moderate toughness steel pipelines is within many ILI tool defect detection capabilities, but the required detection limits for higher strength and lower toughness pipes and very short or very deep crack defects represent a technology development challenge.
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