A Review of Pipeline Damage Assessment and Lifetime Prediction in China

摘要

In the paper, the status quo and development trend were introduced of Chinese Oil and Gas pipeline industry, the significance of safety assessment for oil and gas pipeline was also expounded. The safety assessment was categorized and the safety assessment methods for defect containing pipeline and the latest progress were generalized. The safety assessment for oil and gas pipeline can be categorized as three aspects: the safety assessment of geological disaster, the integrity assessment for defect containing pipeline, and the effective protective life prediction for protection coating layer. The pipeline integrity assessment methods can be further categorized as remaining strength assessment and remaining life prediction for defect containing pipeline. The defects can be classified as five types for remaining strength assessment and three groups for remaining life prediction. Up to now, we have carried out integrity assessment for over fifteen in-service oil and gas pipelines. In the near future, we should focus a certain extent of attention to the geological disaster assessment and effective protection life prediction for coating layer. In the paper, three typical strength remaining models and three service life prediction methods were also introduced briefly. The another main point is focused on fractal characterization of hydrogen induced cracking which is especially a major problem for pipeline in China. The relationship was developed among general efficiency surface energy, hydrogen induced cracking threshold stress intensity factor and fractal dimension. The recent research status quo in China was also reviewed for soil induced stress corrosion cracking and some new interesting phenomena was also reported here. Finally, one typical application example was introduced, that fully accounted for the importance of safety assessment of oil and gas pipeline.