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Effect of Boundary Conditions of Failure Pressure Models on Reliability Estimation of Buried Pipelines

[+] Author Affiliations
Ouk Sub Lee, Jang Sik Pyun, Dong Hyeok Kim

InHa University, Incheon, Korea

Paper No. PVP2003-1984, pp. 15-21; 7 pages
doi:10.1115/PVP2003-1984
From:
  • ASME 2003 Pressure Vessels and Piping Conference
  • Fatigue, Fracture, and Damage Analysis
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4152-9
  • Copyright © 2003 by ASME

abstract

This paper presents the effect of boundary conditions of various failure pressure models published for the estimation of failure pressure. Furthermore, this approach is extended to the failure prediction with the help of a failure probability model. The first order Taylor series expansion of the limit state function is used in order to estimate the probability of failure associated with each corrosion defect in buried pipelines for long exposure period with unit of years. A failure probability model based on the von-Mises failure criterion is adapted. The log-normal and standard normal probability functions for varying random variables are adapted. The effects of random variables such as defect depth, pipe diameter, defect length, fluid pressure, corrosion rate, material yield stress, material ultimate tensile strength and pipe thickness on the failure probability of the buried pipelines are systematically investigated for the corrosion pipeline by using an adapted failure probability model and varying failure pressure model.

Copyright © 2003 by ASME

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