Pipelines

The analysis may examine integrity-management plans, risk assessments, in-line inspection results, pressure tests, direct-assessment records, corrosion monitoring, defect evaluations, repair decisions, and preventive or mitigative measures. PHMSA describes integrity management as a process that combines condition assessments with other relevant information to identify threats, evaluate defects, prioritize repairs, and reduce pipeline risk. Applicable requirements vary with pipeline type and regulatory classification, so the analysis should be tied to the particular system at issue.

In-line inspection tools can provide information about conditions such as metal loss, deformation, and certain cracking or material anomalies, depending on the technology used. A suitably qualified pipeline expert can compare inspection runs over time, reported anomaly dimensions and locations, excavation findings, repair records, and later inspection results to evaluate how a condition was identified and managed. PHMSA recognizes in-line inspection, pressure testing, and direct assessment among the principal methods used for pipeline integrity assessment.

Useful materials may include SCADA and control-room data, pressure and flow histories, alarm logs, valve and pump or compressor records, integrity assessments, in-line inspection files, corrosion and cathodic-protection records, leak surveys, repair histories, excavation records, maps, photographs and video, failed pipe or components, laboratory reports, operator communications, and regulatory incident reports. Original electronic datasets are especially valuable when timing, pressure changes, anomaly growth, or operator response is disputed.