Evaluation of the residual lifetime of a section of a main gas pipeline after long-term operation

The soil environment of an emergency section of a main gas pipeline is characterized as “near-neutral” (pH < 8) with middle or, in some cases, even high (more than 0.3 mm/year) corrosion activity and can be modeled by the NS4 solution. Long-term operation (23 years) decreases mainly the static cr...

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Bibliographic Details
Published in:Materials science (New York, N.Y.) N.Y.), 2012-09, Vol.48 (2), p.231-238
Main Authors: Andreikiv, O. E., Hembara, O. V., Tsyrul’nyk, O. T., Nyrkova, L. I.
Format: Article
Language:English
Subjects:
Analysis
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion
Gas transmission industry
Hydrogenation
Materials Science
Natural gas
Pipe lines
Solid Mechanics
Steel
Structural Materials
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Summary:The soil environment of an emergency section of a main gas pipeline is characterized as “near-neutral” (pH < 8) with middle or, in some cases, even high (more than 0.3 mm/year) corrosion activity and can be modeled by the NS4 solution. Long-term operation (23 years) decreases mainly the static crack resistance of X60 and X70 steels, whereas hydrogenation under the potential of cathodic protection sharply increases their susceptibility to stress corrosion fracture under both static and cyclic loading. The X70 steel is more sensitive to the negative influence of operation and hydrogenation as compared with X60 steel. We have evaluated the residual lifetime of the section of the “Urengoi–Pomary–Uzhgorod” main gas pipeline with regard for hydrogenation of the pipeline wall.
ISSN:1068-820X
1573-885X
DOI:10.1007/s11003-012-9497-7