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Stress-corrosion cracking growth profile in compressor outlet lines



Afanasyev A.V. (FGAO VPO Samara State Aerospace University, RF, Samara), Shabanov K.Yu., Vaskov M.I. (OOO Gazprom Transgaz Samara, RF, Samara)

-mail: speleogad@list.ru
   
This paper considers various implications of operating drivers for stress-corrosion cracking development with reference to crack location history across different segments of a major gas pipeline system. It provides analysis summary for compressor stations and highlights research into outlet pipe samples affected by SCC as well as spectral measurements and main metal corrosion product by-element mapping in affected zones. These comprehensive studies helped us propose a presumably viable flaw mechanism specifically addressing SCC aspects. Microscopic analysis of external pipe surface was used for assessment of multiple cracks. It was found that a relationship exists between crack opening width and its length, averaging 1:10.

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