Assessment of the Residual Lifetime of a Defective Pipeline at Different Hydrogen Concentrations in the Metal

Keywords

pipeline, crack-like defects, residual lifetime, hydrogen concentration

Abstract

The residual lifetime of a pipeline with an axial semi-elliptical crack on the outer surface was estimated. It was established that lifetime significantly decreases with an increase in the hydrogen concentrations in the metal of the pipeline. Similar tendencies are also visible with a change in the a/c relation (defect shape). That is, more elongated semi-elliptical cracks are more dangerous as compared to deeper defects. In general, of all the considered cases, the most dangerous is an elongated (a/c = 0.25) axial semi-elliptical crack on the outer surface of the pipe at a hydrogen concentration in the metal of the pipeline СH = 5.462 ppm.

References

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