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Long-term operation of oil and gas transit pipelines causes degradation of as-received mechanical properties what intensifies hydrogen-induced and stress corrosion cracking and finally failure risk increase. From the other hand, it is known [1–4] that the parameters of crack growth resistance (the parameters of fracture mechanics) are the most sensitive to in-service degradation, especially the corrosion crack growth characteristics. Usually, the factor of material degradation does not take into consideration at a modelling of crack growth under the simultaneous action of working stresses and aggressive environments. In this paper, the methods of an evaluation of the residual lifetime of pipes of oil and gas pipelines with taking into account their degradation during operation are presented using corrosion and hydrogen fracture mechanics approaches. The results of such calculations are given for some cases of crack growth across the pipe wall.

Calculation of pipe residual lifetime of the exploited oil and gas pipelines