Article

Journal of Mechanical Science and Technology

, Volume 27, Issue 2, pp 367-374

Mechanical reliability analysis of tubes intended for hydrocarbons

  • Mourad NahalAffiliated withLR3MI, Department of Mechanical Engineering, Badji Mokhtar University Email author 
  • , Rabia KhelifAffiliated withLR3MI, Department of Mechanical Engineering, Badji Mokhtar University

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Abstract

Reliability analysis constitutes an essential phase in any study concerning reliability. Many industrialists evaluate and improve the reliability of their products during the development cycle—from design to startup (design, manufacture, and exploitation)—to develop their knowledge on cost/reliability ratio and to control sources of failure. In this study, we obtain results for hardness, tensile, and hydrostatic tests carried out on steel tubes for transporting hydrocarbons followed by statistical analysis. Results obtained allow us to conduct a reliability study based on resistance request. Thus, index of reliability is calculated and the importance of the variables related to the tube is presented. Reliability-based assessment of residual stress effects is applied to underground pipelines under a roadway, with and without active corrosion. Residual stress has been found to greatly increase probability of failure, especially in the early stages of pipe lifetime.

Keywords

Factor of importance First/second order reliability methods Hardness test Index of reliability Pipeline Tensile test