Remaining Strength of Corroded Pipe Under Secondary (Biaxial) Loading

Project Categories

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• Gas Pipeline
• Leak Detection
• Damage Prevention

Main Objective

To develop simplified guidance to assess corrosion metal loss defects in pipelines that are subjected to external loadings in service. Ongoing analytical work is developing simplified rules and methods to account for the effects of secondary loads on the behavior of corroded pipelines, avoiding the need to resort to complex numerical analysis using non-linear finite element analysis (FEA). Extension of this analytical work to address the full range of combined pressure/secondary loading and pipe/defect geometries, and validation of the simplified rules by conducting selected full-scale tests will provide the necessary information on which to base modifications to extend the current guidance beyond pressure-only loading. This work will also address buckling.

Public Abstract

The Pipeline Safety Research and Development program will: a) Improve an operator's ability to determine the severity of damage from localized corrosion and its effect on pipeline operating pressure margins; b) Develop comprehensive and consistent methods for assessing corrosion in the field; and c) Provide a sound basis for establishing corrosion re-assessment intervals for integrity management protocols.
See also Project No 171, Project No 172, Project No 173, Project No 175 for other projects in this Consolidated Program.