Threat/Anomaly Mitigation Decision-Making Process

Pipeline operators must excavate and examine anomalies discovered through in-line inspection (ILI) and direct assessment (DA) in a timely manner to assure that critical flaws are repaired before they become severe enough to cause a pipeline to fail at its maximum operating pressure. They must also periodically re-assess their pipelines that are located in or could affect high consequence areas. Prescriptive regulations often require examinations or re-assessments of anomalies to be carried out after specific time periods. Pipeline integrity management standards such as ASME B31.8S and API 1160 provide guidance to operators with respect to identifying threats to pipeline integrity, gathering data for estimating risks associated with different threats, prioritizing pipeline segments, conducting engineering critical assessments, evaluating remaining lives, and scheduling future re-assessments. While these standards have served the industry well, they could be strengthened in two areas, i.e., Interaction of Threats/Anomalies and Guidance for Scheduling of Excavations and Re-Assessments. To specifically enhance these two aspects, this project was supported by the Pipeline and Hazardous Materials Administration (PHMSA) under DOT Agreement DTPH5614H00005 - "Threat/Anomaly Mitigation Decision-Making Process". The work involved reviewing and assessing approaches to flaw interaction and probabilistic evaluation methods. Three categories of anomalies, corrosion, crack-like, and mechanical damage, were investigated in sequential order. Improvements to the above-mentioned pipeline standards were described and demonstrated in each milestone interim report submitted to PHMSA. The findings are summarized hereinafter and detailed in the following individual annex reports: (A) Review of Existing Rules and Methods for Evaluating Interaction, by Jing Ma, Benjamin Zand and Robert Francini; (B) Deterministic and Probabilistic Approaches for Scheduling Mitigations of Corrosion Regions, by Jing Ma; (C) Deterministic and Probabilistic Approaches for Scheduling Mitigations of Crack-like Anomalies, by Jing Ma and M. J. Rosenfeld; and (D) Deterministic and Probabilistic Approaches for Scheduling Mitigations of Mechanical Damage, by Jing Ma, Fan Zhang and Guy Desjardins.

  • Record URL:
  • Corporate Authors:

    Kiefner and Associates, Incorporated

    4480 Bridgeway Avenue, Suite D
    Columbus, OH  United States  43219

    Pipeline and Hazardous Materials Safety Administration

    Department of Transportation
    East Building, 2nd Floor, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Ma, Jing
  • Publication Date: 2016-2-23


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Tables;
  • Pagination: 237p

Subject/Index Terms

Filing Info

  • Accession Number: 01638930
  • Record Type: Publication
  • Report/Paper Numbers: Report No. 16-025
  • Contract Numbers: DTPH5614H00005
  • Files: TRIS, ATRI, USDOT
  • Created Date: Jun 26 2017 5:41PM