Optimal inspection planning for onshore pipelines subject to external corrosion

Author(s)

Gomes, Wellison J. S. ^[1] ; Beck, Andre T. ^[1] ; Haukaas, Terje ^[2]

Affiliation

^[1] Univ Sao Paulo, Dept Struct Engn, BR-13566590 Sao Carlos, SP - Brazil

^[2] Univ British Columbia, Dept Civil Engn, Vancouver, BC V6T 1Z4 - Canada

• Document type: Journal article
• Source: RELIABILITY ENGINEERING & SYSTEM SAFETY; v. 118, p. 18-27, OCT 2013.
• Web of Science Citations: 47

Abstract

Continuous operation of pipeline systems involves significant expenditures in inspection and maintenance activities. The cost-effective safety management of such systems involves allocating the optimal amount of resources to inspection and maintenance activities, in order to control risks (expected costs of failure). In this context, this article addresses the optimal inspection planning for onshore pipelines subject to external corrosion. The investigation addresses a challenging problem of practical relevance, and strives for using the best available models to describe random corrosion growth and the relevant limit state functions. A single pipeline segment is considered in this paper. Expected numbers of failures and repairs are evaluated by Monte Carlo sampling, and a novel procedure is employed to evaluate sensitivities of the objective function with respect to design parameters. This procedure is shown to be accurate and more efficient than finite differences. The optimum inspection interval is found for an example problem, and the robustness of this optimum to the assumed inspection and failure costs is investigated. It is shown that optimum total expected costs found herein are not highly sensitive to the assumed costs of inspection and failure. (c) 2013 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 09/17365-6 - Risk optimization under random fatigue and corrosion processes
• Grantee: Wellison José de Santana Gomes
• Support Opportunities: Scholarships in Brazil - Doctorate