With the availability of in-line inspection data, pipeline operators have additional information to develop the technical and economic justification for integrity verification programs (i.e. Fitness-for-Purpose) across an entire pipeline system. The Probability of Exceedance (POE) methodology described herein provides a defensible decision making process for addressing immediate corrosion threats identified through metal loss in-line inspection (ILI) and the use of sub-critical in-line inspection data to develop a long term integrity management program. In addition, this paper describes the process used to develop a Corrosion In-line Inspection POE-based Assessment for one of the systems operated by TransGas Limited (Saskatchewan, Canada). In 2001, TransGas Limited and CC Technologies undertook an integrity verification program of the Loomis to Herbert gas pipeline system to develop an appropriate scope and schedule maintenance activities along this pipeline system. This methodology customizes Probability of Exceedance (POE) results with a deterministic corrosion growth model to determine pipeline specific excavation/repair and re-inspection interval alternatives. Consequently, feature repairs can be scheduled based on severity, operational and financial conditions while maintaining safety as first priority. The merging of deterministic and probabilistic models identified the Loomis to Herbert pipeline system’s worst predicted metal loss depth and the lowest safety factor per each repair/reinspection interval alternative, which when combined with the cost/benefit analysis provided a simplified and safe decision-making process.
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2002 4th International Pipeline Conference
September 29–October 3, 2002
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
0-7918-3620-7
PROCEEDINGS PAPER
Probability of Exceedance (POE) Methodology for Developing Integrity Programs Based on Pipeline Operator-Specific Technical and Economic Factors
Rafael G. Mora,
Rafael G. Mora
CC Technologies Canada, Ltd., Calgary, AB, Canada
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Curtis Parker,
Curtis Parker
TransCanada, Ltd., Regina, SK, Canada
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Patrick H. Vieth,
Patrick H. Vieth
CC Technologies, Dublin, OH
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Burke Delanty
Burke Delanty
CC Technologies Canada, Ltd., Calgary, AB, Canada
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Rafael G. Mora
CC Technologies Canada, Ltd., Calgary, AB, Canada
Curtis Parker
TransCanada, Ltd., Regina, SK, Canada
Patrick H. Vieth
CC Technologies, Dublin, OH
Burke Delanty
CC Technologies Canada, Ltd., Calgary, AB, Canada
Paper No:
IPC2002-27224, pp. 1793-1801; 9 pages
Published Online:
February 24, 2009
Citation
Mora, RG, Parker, C, Vieth, PH, & Delanty, B. "Probability of Exceedance (POE) Methodology for Developing Integrity Programs Based on Pipeline Operator-Specific Technical and Economic Factors." Proceedings of the 2002 4th International Pipeline Conference. 4th International Pipeline Conference, Parts A and B. Calgary, Alberta, Canada. September 29–October 3, 2002. pp. 1793-1801. ASME. https://doi.org/10.1115/IPC2002-27224
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