51313-02063-Direct Assessment of Failure Pressure of High-Strength Steel Pipelines

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Product Number: 51313-02063-SG

ISBN: 02063 2013 CP

Author: Frank Cheng

Publication Date: 2013

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Development of high-strength steel pipeline technology would enable the pipeline industry to realize significant cost-savings by reducing the pipe wall thickness and increasing the operating pressure to satisfy the construction of long-distance large diameter and high operating pressure pipelines. However the pipelines experience severe environmental conditions e.g. significant ground movement resulting in additional stresses/strains exerting on the pipe wall.

In this work several industrial models available for assessment of failure pressure of pipelines were evaluated with respect to various grades of pipeline steel and depths of corrosion defect. Moreover a finite element (FE) model was developed to simulate the complex stress/strain conditions potentially exerted on the high-strength steel pipelines due to the synergism of internal pressure soil strain and local stress/strain concentration at corrosion defects. The corrosion behaviour of the steel was investigated under elastic and plastic strains.

Results demonstrate that the developed FE model is capable of simulating the stress/strain concentration at corrosion defects due to the synergistic effect of internal pressure and soil stress/strain under a wide variety of the steel grades and depths of corrosion defect. Moreover the failure pressure of pipelines can be predicted with considerations of complex stress/strain conditions developed at the corrosion defect. While an elastic strain would not affect the steel corrosion at a detectable level the effect of plastic strain is much remarkable. For optimization of pipeline design the reliable risk assessment of high-strength steel pipelines should consider the corrosion enhancement and stress/strain concentration under the synergism of internal pressure and soil induced stress/strain.