The Reliability Estimation of Buried Pipeline Using the FAD and FORM

파손평가선도(FAD)와 FORM을 이용한 매설배관의 건전성 평가

  • Lee, Ouk-Sub (Department of Mechanical Engineering, INHA University) ;
  • Kim, Dong-Hyeok (Department of Mechanical Engineering, INHA University)
  • 이억섭 (인하대학교 기계공학과) ;
  • 김동혁 (인하대학교 기계공학과)
  • Published : 2005.12.31


In this paper, the methodology for the reliability estimation of buried pipeline with longitudinal gouges and dent is presented and the limit state of buried pipeline is formulated by failure assessment diagram(FAD). The reliability of buried pipeline with defects has been estimated by using a theory of failure probability. The failure probability is calculated by using the FORM(first order reliability method) and Monte Carlo simulation. The results out of two procedures have been compared each other. It is found that the FORM and Monte Carlo simulation give similar results for varying boundary conditions and various random variables. Furthermore, it is also recognized that the failure probability increases with increasing of dent depth, gouge depth, gouge length, operating pressure, pipe outside radius and decreasing the wall thickness. And it is found that the analysis by using the failure assessment diagram gives highly conservative results than those by using the theory of failure probability.


  1. H. Seo, T.S. Han and H.Y. Lee, 'Failure Assessment Diagrams of Semi-Elliptical Surface Crack with Constraint Effect', Journal of KSME, Vol. 23, No. 11, pp. 2022-2032, 1999
  2. B. Limited, 'Probabilistic methods : Uses and abuses in structural integrity', HSE, 2001
  3. O.S. Lee and D.H. Kim, 'Estimation of Failure Probability Using Boundary Conditions of Failure Pressure Model of Buried Pipelines', Key Engineering Materials, Vol. 270, pp. 1688-1693, 2004
  4. S.L. Kwak, J.B. Wang, Y.W. Park and J.S. Lee, 'Application of FAD on Pressure Tube for the Probabilistic Integrity Assessment', Journal of KSME, Vol. 28, No. 3, pp. 289-295, 2004
  5. Y.C. Lin, Y.J. Xie and X.H. Wang, 'Probabilistic Fracture Failure Analysis of Nuclear Piping Containing Defects Using R6 Method', Nuclear Engineering and Design, Vol. 229, pp. 237-246, 2004
  6. Y. J. Kim, D. J. Shim, N. S. Huh and Y. J. Kim, 'Elastic-Plastic Fracture Mechanics Assessment of Test Data for Circumferential Cracked Pipes', Engineering Fracture Mechanics, Vol. 71, pp. 173-191, 2004
  7. M. Ahammed, 'Probabilistic estimation of remaining life of a pipeline in the presence of active corrosion defects', Int. J. Pressure Vessels and piping, Vol. 75, No. 4, pp. 321-329, 1998
  8. T.L. Anderson, 'Fracture Mechanics; Fundamentals and Applications; Second Edition', CRC press, 1995
  9. S. Mahadevan and A. Haldar, 'Reliability Assessment Using Stochastic Finite Element Analysis', John Wiley & Sons, 2000
  10. S. Mahadevan and A. Haldar, 'Probability, Reliability and Statistical Method in Engineering Design', John Wiley & Sons, 2000