The Analysis of the Influence of Various Factors on the Development of Stress Corrosion Defects in the Main Gas Pipeline Walls in the Conditions of the European Part of the Russian Federation

• Published in: International journal of corrosion Vol. 2018; no. 2018; pp. 1 - 10
• Main Authors: Vaskov, M. I., Konovalov, S. V., Mel’nikov, A. A., Afanasyev, A.V.
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Publishing Corporation 01-01-2018; Hindawi; Hindawi Limited
• Subjects: Controlled rolling; Corrosion; Corrosion products; Crack propagation; Cracks; Cyclic loading; Cyclic loads; Defects; Gas pipelines; Hydrogen sulfide; Hydrogen sulphide; Inspection; Materials fatigue; Mechanical tests; Metals; Natural gas; Nonmetallic inclusions; Organizations; Parameters; Pipes; Spectral analysis; Steel; Steel pipes; Stress corrosion; Stress corrosion cracking; Submarine pipelines; Sulphides; Walls; X ray spectra; Russia
• ISSN: 1687-9325; 1687-9333
• DOI: 10.1155/2018/1258379

This paper considers the factors influencing the formation and development of stress corrosion defects detected during the inspection and overhaul of the main gas pipeline section. The surveyed gas pipeline is made of large diameter steel pipes made by controlled rolling, produced by various companies, with the predominance of pipes produced by the Khartsyzsk Pipe Plant (KhPP). The correlation between the geometric parameters of defects is described, which makes it possible to estimate the depth of cracks by external parameters. Mechanical tests by cyclic loading of samples containing cracks, based on the site operation data for the last 11 years, showed no crack growth in the absence of a corrosive medium. Micro-X-ray spectral analysis of metal and corrosion products showed no trace of the influence of hydrogen sulphide and nonmetallic inclusions (sulphides) on the development process of SCC. According to the results of the research, the process of development of stress corrosion on the main gas pipelines located in the European part of the Russian Federation is described. The organization operating the gas pipeline is recommended to take into consideration the results of this work during drawing up their repair plan.