Optimal Inspection Planning for Corroded Pipelines Considering Repair Decision Error
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 15, Issue 2
Abstract
The optimal inspection planning of pipelines is mandatory for safe and economical operation under degradation processes, particularly corrosion induced by soil and environmental aggressiveness. In addition to the random nature of corrosion, the applied inspection tools and procedures provide significant uncertainties related to detecting corrosion defects and measuring the observed defect size. This work aims to consider the imperfect inspection results in terms of defect detection and sizing for optimal planning of pipeline maintenance. The pipeline degradation considers the spatial variability of corrosion in different exposure zones and its autocorrelation using the Karhunen–Loève expansion. Monte Carlo simulations compute the time-variant failure probability of a system formed by components in series. Then, the maintenance model is developed based on the inspection decision tree, where imperfect inspections and repair decision errors are considered. The developed model is applied to a gas pipeline under space-variant corrosion to show the effects of the main system parameters. The results show that defect detection and size measurements play a fundamental role in the optimal maintenance strategy, where improving inspection quality decreases the optimal inspection interval. In contrast, a higher inspection cost increases the optimal interval. Moreover, ignoring the impact of spatial variability and unacceptable error results in significant errors in the expected total cost and optimal inspection interval.
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Acknowledgments
The authors convey their utmost appreciation to the Algerian General Directorate of Scientific Research and Technological Development for their generous support of this project (A01L09UN410120200001).
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Information & Authors
Information
Published In
Journal of Pipeline Systems Engineering and Practice
Volume 15 • Issue 2 • May 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jul 11, 2023
Accepted: Nov 13, 2023
Published online: Jan 27, 2024
Published in print: May 1, 2024
Discussion open until: Jun 27, 2024
ASCE Technical Topics:
- Architectural engineering
- Building management
- Chemical degradation
- Chemical processes
- Chemistry
- Construction engineering
- Construction management
- Corrosion
- Defects and imperfections
- Deterioration
- Engineering fundamentals
- Environmental engineering
- Errors (statistics)
- Geomechanics
- Geotechnical engineering
- Infrastructure
- Inspection
- Maintenance and operation
- Materials characterization
- Materials engineering
- Mathematics
- Pipeline systems
- Pipelines
- Soil dynamics
- Soil mechanics
- Soil-pipe interaction
- Statistics
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