Can internal inspection be performed using only a deformation tool if the analysis of the pipeline demonstrates that corrosion is not a primary integrity threat for a specific pipeline segment?
No. The rule requires that internal inspection be performed with a tool or tools capable of detecting corrosion and deformation anomalies. However, after conducting the baseline assessment, it is possible that an operator might determine that the interval between metal loss tool runs could be extended beyond the five year reassessment interval if the assessment results review, data integration, and risk analysis demonstrates the line to be in good condition and corrosion is not a significant threat. In this case the operator would have to notify PHMSA Pipeline Safety of its intent to use an extended interval between metal loss tool runs, provide the technical basis for this determination, and describe the external monitoring activities that are in place to assure the pipe remains in good condition. PHMSA Pipeline Safety will review the technical basis for such assessment intervals during inspections.
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