Analytical Collapse Capacity of Corroded Pipes

摘要

Buckling and collapse strength of corroded pipes has been investigated, for cost-effective and safe design of pipelines and risers. Two sets of analytical equations are newly proposed for collapse capacity of corroded pipes, by extending the existing analytical equations for non-corroded pipes: (1) Elastic-plastic buckling of pipes under external pressure (Timoshenko's equation). (2) Collapse of pipes under internal pressure, bending and axial force (Mohareb's analytical equations). The analytical equations agree well with results of finite element analysis and laboratory tests, and may be used in strength assessment and risk-based corrosion allowance design.