Integrity management of dent and dent associated with metal loss requires knowledge of in-line inspection (ILI) technologies, government regulations and industry codes, prescriptive requirements, and most importantly assessment models to estimate severity of the mechanical damage. The assessment models have greatly relied on the assumed capabilities of current ILI technologies to detect, discriminate and size the mechanical damage. Therefore, an investigation of the current ILI technologies and validation of their capabilities are practically important. In this paper, the current status of ILI technologies for dent and dent with metal loss is reviewed. Validation data provided by ILI inspection vendors and pipeline operators are analyzed in terms of probability of detection (POD), probability of identification (POI), probability of false call (POFC), and sizing accuracy using binomial probability distribution and confidence interval methods. Linear regression analysis is also performed to determine sizing error bands. High resolution pull test data validated with LaserScan 3-D mapping technology is used to demonstrate a better evaluation of ILI performance with minimized in-ditch measurement errors and the effect of change in dent geometry and dimension due to re-bounding and re-rounding. Issues associated with field measurement and improvement are discussed.
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2010 8th International Pipeline Conference
September 27–October 1, 2010
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4420-5
PROCEEDINGS PAPER
Investigate Performance of Current In-Line Inspection Technologies for Dents and Dent Associated With Metal Loss Damage Detection
Ravi Krishnamurthy
Ravi Krishnamurthy
Blade Energy Partners, Houston, TX
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Ming Gao
Blade Energy Partners, Houston, TX
Ravi Krishnamurthy
Blade Energy Partners, Houston, TX
Paper No:
IPC2010-31409, pp. 615-626; 12 pages
Published Online:
April 4, 2011
Citation
Gao, M, & Krishnamurthy, R. "Investigate Performance of Current In-Line Inspection Technologies for Dents and Dent Associated With Metal Loss Damage Detection." Proceedings of the 2010 8th International Pipeline Conference. 2010 8th International Pipeline Conference, Volume 1. Calgary, Alberta, Canada. September 27–October 1, 2010. pp. 615-626. ASME. https://doi.org/10.1115/IPC2010-31409
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