Corrosion and stress corrosion cracking (SCC) control programs are elements of pipeline integrity management. These programs often include in-line inspections (ILI’s) to identify, characterize and size anomalies, followed by field excavations to repair defects, remediate coating failures, and establish tool sizing accuracy. The highest priority excavations target anomalies with the lowest predicted remaining strength or deepest flaws. In cases where loss of pipeline integrity is highly consequential, selection of additional excavation sites based on the risk of failure is warranted. As specified in Annex B of CSA Z662-07, the risk of failure combines probability (typically based on the predicted remaining life of known corrosion or cracking features) with an evaluation of consequence along the pipeline length. Consequence evaluation typically considers the impacts of health and safety, environmental, property damage, public disruption, service interruption and financial loss. A practical methodology for evaluating consequence for liquid pipelines was developed for the NPS 10 Alberta Products Pipeline (APPL) in Alberta, Canada. Comprising of three (3) parts, the methodology starts with an evaluation of spill volume along the pipeline based on valve closure times and pipeline inventory drawdown. Combined with soil absorption data and topography, the spill volumes are used to model spill areas along the pipeline. Finally, the spill areas are overlaid on a classification of land use along the pipeline to quantify the relative spill consequence. The land use classification developed for this analysis has commonalities with the definitions for High Consequence Areas (HCA) and Unusually Sensitive Areas (USA) within U.S. Code of Federal Regulations (49 CFR, Part 195). Prioritized segments of the pipeline with elevated consequence levels were identified and used with the probability of failure to calculate risk and prioritize sites for ILI excavation programs.
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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:
978-0-7918-4423-6
PROCEEDINGS PAPER
Spill Consequence Analysis: A Method to Prioritize Integrity Excavations of Liquid Pipelines Available to Purchase
Jana M. Haggins,
Jana M. Haggins
Cimarron Engineering Ltd., Calgary, AB, Canada
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Edgar I. Cote,
Edgar I. Cote
Cimarron Engineering Ltd., Calgary, AB, Canada
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Kristine Morgan,
Kristine Morgan
Cimarron Engineering Ltd., Calgary, AB, Canada
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Ehab Shaheen
Ehab Shaheen
Cimarron Engineering Ltd., Calgary, AB, Canada
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Jana M. Haggins
Cimarron Engineering Ltd., Calgary, AB, Canada
Edgar I. Cote
Cimarron Engineering Ltd., Calgary, AB, Canada
Kristine Morgan
Cimarron Engineering Ltd., Calgary, AB, Canada
Ehab Shaheen
Cimarron Engineering Ltd., Calgary, AB, Canada
Paper No:
IPC2010-31645, pp. 685-692; 8 pages
Published Online:
April 4, 2011
Citation
Haggins, JM, Cote, EI, Morgan, K, & Shaheen, E. "Spill Consequence Analysis: A Method to Prioritize Integrity Excavations of Liquid Pipelines." Proceedings of the 2010 8th International Pipeline Conference. 2010 8th International Pipeline Conference, Volume 4. Calgary, Alberta, Canada. September 27–October 1, 2010. pp. 685-692. ASME. https://doi.org/10.1115/IPC2010-31645
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