Reliability-based maintenance optimization of pipelines considering space-variant corrosion rate Sahraoui, Yacine; Chateauneuf, Alaa; Khelif, Rabia
The present work aims at developing a procedure for inspection optimization of pipelines subject to corrosion, including predictive degradation modelling, space-variant corrosion rate, time-dependent reliability assessment and inspection uncertainties. The space-variant corrosion is considered by the mean of Karhunen-Loève expansion in order to take account of soil aggressiveness regarding the variability of corrosion rate along the pipe length. The failure probability is evaluated by a series system combination, using Monte Carlo simulations. Then, the maintenance model is developed according to the inspection decision tree, where imperfect inspections are taken into account. Finally, the developed model is applied to gas pipeline under various corrosion rates, in order to show the effects of the main parameters of the system.
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