The Draft Final Report presents the findings of a two-phased study completed by C-FER Technologies on evaluating the performance capabilities of ILI crack detection tools with regard to detecting and sizing/characterizing crack features. The evaluation of ILI tool performance is based on API 1163 criteria and definitions. C-FER used ILI and corresponding in-ditch data for SCC features from four pipeline operating companies to establish models for POD, POI, POFC, and sizing accuracy.
The results of the models developed for these four (4) parameters were then applied to a crack management process recommended by C-FER that is based on pipeline reliability methods of analysis. Some of the key items addressed in the report include: 1. Estimating inline tool uncertainty; 2. Calculating inline tool performance using field data; 3. Using probability of detection to estimate non-detected defects (what the ILI tool missed); and 4. Field data collection recommendations.
Recommendations are provided in the report to build on the results from the C-FER study, including the continued effort of the industry to collect and analyze data for a more substantial database upon which the reliability methods van be based and verified. Another key recommendation and topic for consideration for PRCI is the development of guidelines for a standard approach for in ditch defect measurement. With additional data collection and consistent methods for collecting field data, the reliability of ILI tools to detect, identify, and size cracks and crack-like features van be improved. These recommendations will be considered in the development of the PRCI 2014 annual research ballot.
The results of this study will also be used in the recently initiated ILI Crack Tool Reliability project. PRCI expects to issue the Final Report for this project in the second quarter of 2013. PRCI Members can view the Draft Final Report in PRIME.