Local buckling reliability assessment of corroded subsea pipelines under combined loads

Bhardwaj, U.; Teixeira, A.P.; Guedes Soares, C.

Key information

Authors:

Bhardwaj, U. (Utkarsh Bhardwaj); Teixeira, A.P. (Ângelo Manuel Palos Teixeira); Guedes Soares, C. (Carlos Guedes Soares)

Published in

2022

Abstract

This paper assesses the structural safety of subsea corroded pipes subjected to combined loads. The reliability problem is formulated in terms of bending moment capacity criteria of corroded pipelines subjected to bending moment, axial loads, and internal and external pressure. First, the analytical solutions for ultimate bending load carrying capacity of corroded pipes are adopted under four loading scenarios. Reliability calculations are conducted for bending moment, burst and collapse capacity limit states using the case study of a subsea pipeline under operating conditions. Adequate probabilistic models are adopted for the basic variables and the reliability of the pipes are calculated by Monte Carlo simulation. Results of reliability variation with increasing corrosion defect parameters for the four cases are presented. Parametric studies are also conducted to assess the effect of axial loads, operating pressure and water depth on the reliability of corroded pipe using the bending moment capacity criteria of corroded pipelines.