D. V. Novgorodov, V. G. Rybalko

FEATURES OF THE EVOLUTION OF CORROSION CRACKING IN GAS FLOW LINES

The paper studies gas flow lines and underground gas pipelines of compressor stations which are susceptible to damage by stress corrosion cracking (SCC). Factors of a technological and operational nature governing the conditions of SCC evolution in existing gas pipelines are noted. Defects of a long growth period are investigated. It has been found that, during operation, the evolution of defects can stop, but it resumes under the effect of high off-design loads. Crack evolution may be caused by seasonal soil movements, repair work, and other factors causing overloads at the tips of stable cracks. A solution is proposed to increase the reliability of pipeline operation by monitoring the stability of the stress state in individual sections.

Acknowledgment: The work was carried out within the framework of the state assignment of FANO of Russia (topic "Diagnostics," № АААА-А18-118020690196-3)

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