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| The Fitness-for-service Assessment and Maintenance Decision-making of a Refined Oil Pipeline |
| Received:October 29, 2020 Revised:January 05, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.04.006 |
| KeyWord:refined oil pipeline in-line inspection applicability evaluation remaining life prediction maintenance decision |
| Author | Institution |
| LI Ming |
Dalian Research Institute of Petroleum and Petrochemicals SINOPEC, Dalian , China |
| YANG Wen |
Pipe China South China Branch, Guangzhou , China |
| NIU Che |
Pipe China East China Branch, Shanghai , China |
| DU Wei |
Pipe China East China Branch, Shanghai , China |
| YANG Jing |
Dalian Research Institute of Petroleum and Petrochemicals SINOPEC, Dalian , China |
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| Abstract: |
| A method for applicability evaluation and maintenance decision-making based on in-line inspection for refined oil pipelines is established. According to the pipeline defects in the inspection data of a product oil pipeline, statistical analysis of the relationship between the defect size characteristics and the girth weld is carried out. Considering factors such as the influence of combined defects and girth welds, and the characteristics of defects, the criteria for determining the defect maintenance of refined oil pipelines are formulated. Combined with defect residual strength evaluation, residual life prediction and comprehensive factor analysis, the defect maintenance decision is determined, and the next pipeline inspection time proposal is proposed. According to the statistics on the characteristics of pipeline defects, it is found that the internal and external corrosion of the pipeline is relatively prominent; the external corrosion defects of the pipeline are relatively uniform, while the internal corrosion defects are more concentrated. The analysis on the relationship between corrosion defects and girth welds reveals that there are three suspected welds with anti-corrosion coatings for the failure of the repair, and further excavation and verification shall be conducted. After evaluation and analysis, it is recommended that the pipeline does not need an immediate repair of the defects, and the planned response time for all 93 corrosive metal loss defects is within 5 years; considering the integrity of the pipeline, combined with the remaining life prediction results, the next inspection interval of 5a is suggested. The method of ASME B31G, segmented corrosion rate prediction and other methods are adopted to carry out pipeline applicability evaluation, and a better defect repair response level and repair time are determined with this. Furthermore, taking into account the complexity of the pipeline service environment and the limitation of detection accuracy, the defect repair plan should be revised based on the actual pipeline operation and the results of the excavation verification. |
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