Journal
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
Volume 87, Issue 10, Pages 587-595Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2010.07.011
Keywords
Pipeline; Metal-loss corrosion; System reliability; Failure modes; Stochastic; Spatial variability
Funding
- Natural Science and Engineering Research Council of Canada (NSERC) [376295-2009]
- Faculty of Engineering at the University of Western Ontario
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A methodology is presented in this paper to evaluate the time-dependent system reliability of a pipeline segment that contains multiple active corrosion defects and is subjected to stochastic internal pressure loading. The pipeline segment is modeled as a series system with three distinctive failure modes due to corrosion, namely small leak, large leak and rupture. The internal pressure is characterized as a simple discrete stochastic process that consists of a sequence of independent and identically distributed random variables each acting over a period of one year. The magnitude of a given sequence follows the annual maximum pressure distribution. The methodology is illustrated through a hypothetical example. Furthermore, the impact of the spatial variability of the pressure loading and pipe resistances associated with different defects on the system reliability is investigated. The analysis results suggest that the spatial variability of pipe properties has a negligible impact on the system reliability. On the other hand, the spatial variability of the internal pressure, initial defect sizes and defect growth rates can have a significant impact on the system reliability. (C) 2010 Elsevier Ltd. All rights reserved.
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