Peculiarities of corrosion degradation of steel of oil pipelines

Authors

DOI:

https://doi.org/10.15587/1729-4061.2014.26265

Keywords:

oil pipeline, crack-like defect, diagram of cyclic corrosion crack resistance, stress intensity factor

Abstract

Both domestic and foreign scholars dealt with studying various aspects of corrosion degradation of steels of oil pipelines. At present, there are numerical-analytical methods for calculating stress intensity factors for cracks of various shapes in cylindrical bodies under loads, simulating the operational loads on the oil pipeline, as well as methods for assessing the operational degradation of materials of oil pipelines.

However, it is necessary to take into account the fact that degradation of the material under the long-term action of the operational factors is a multi-stage process, and the effect of each stage ultimately determines the durability of the tube element in predetermined operating conditions.Therefore, the subcritical growth of corrosion or crack-like defects, caused by the combined action of operating loads and media is crucial. In current approaches, these processes have not yet been sufficiently investigated and are not taken into account when predicting the performance of oil pipelines, in particular degradation of physical and mechanical properties of the metal used.

Engineering evaluation of the rate of corrosion failure of oil pipelines, taking into account both mechanical and physicochemical parameters of the interaction of the deformed metal with the working medium was carried out in the paper. The characteristics of the cyclic corrosion crack resistance of the metal of the pipe of oil pipelines taking into account the effect of operational factors.

New data about the features of corrosion-fatigue failure of pipes depending on the original sizes and shape of the defects were obtained. Diagrams of cyclic crack resistance of unexploited and exploited pipe steels 10Г2БТЮ3 and steel 20 were built. It was found that the water corrosive media (soil and distilled water) significantly affect the propagation process of fatigue crack in the studied steels.

Author Biography

Vasyl Luzhetskyy, Ivan Franko Drohobych State Pedagogical University

Dr. Eng., Associate Professor Department of Mechanical Engineering and Technology-based

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Published

2014-08-13

How to Cite

Luzhetskyy, V. (2014). Peculiarities of corrosion degradation of steel of oil pipelines. Eastern-European Journal of Enterprise Technologies, 4(5(70), 52–55. https://doi.org/10.15587/1729-4061.2014.26265

Issue

Vol. 4 No. 5(70) (2014): Applied physics. Materials Science

Section

Materials Science

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Copyright (c) 2014 Vasyl Luzhetskyy

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