|
| Corrosion Failure Analysis of an Oil and Gas Gathering Pipeline |
| Received:April 02, 2018 Revised:August 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.08.005 |
| KeyWord:corrosion evaluation of pipeline failure pipe material detection medium analysis product detection occluded corrosion |
| Author | Institution |
| SUN Fang-ping |
1. Xi'an Changqing Technology Engineering Co., Ltd., Xian , China |
| ZHANG Ying-ying |
2. CNPC Research Institute of Engineering Technology, Tianjin , China; 3. Key Laboratory of Tubular Goods Engineering, CNPC, Research Division of Corrosion Coating and Thermal Insulation Structure, Tianjin , China |
| ZHANG Zhi-hao |
1. Xi'an Changqing Technology Engineering Co., Ltd., Xian , China |
| ZHANG Yan-ju |
2. CNPC Research Institute of Engineering Technology, Tianjin , China; 3. Key Laboratory of Tubular Goods Engineering, CNPC, Research Division of Corrosion Coating and Thermal Insulation Structure, Tianjin , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To master the mechanism of pipeline corrosion and put forward a pertinent anticorrosion scheme. Methods The corrosion pipe section and medium sampling were carried out on the spot, pipe section analysis､corrosion medium composition analysis and corrosion product analysis were adopted to test and analyze causes of pipeline corrosion failure in the room. Results There were uneven sediments on the inner surface of the failure pipe, and some parts were stripped off and there were cracks. The performance of the pipe met the requirement of the performance index of 20# steel. The conveying medium had high salinity and high content of Cl and SO42. The main components of corrosion products were oxides and hydroxides of several Fe, such as Fe (OH)2, Fe2O3 and FeO(OH), and also some chloride and sulfide. Conclusion The main corrosion type of pipeline in the medium is the occluded corrosion caused by corrosion products. The medium contains H2S. O2 and H2S corrosion occur in the pipe under water bearing conditions and eventually lead to thinning and failure of pipeline. |
| Close |
|
|
|