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| Corrosion Causes of Liquid Phase Pipeline Flanges for Separators of a Gas Field in the West of China |
| Received:October 16, 2023 Revised:November 15, 2023 |
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| DOI：10.7643/issn.1672-9242.2024.02.015 |
| KeyWord:s of the Tenth National Corrosion Congress. Nanchang:[s.n.], 2018. |
| Author | Institution |
| CHEN Qingguo |
Tarim Oilfield Company, Petrochina, Xinjiang Korla , China |
| CHANG Zeliang |
Tarim Oilfield Company, Petrochina, Xinjiang Korla , China |
| WU Chao |
Tarim Oilfield Company, Petrochina, Xinjiang Korla , China |
| WANG Shuai |
State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials, Tubular Goods Research Institute, CNPC, Shaanxi Xi'an , China ;College of Chemistry & Environmental Engineering, Yangtze University, Hubei Jingzhou , China |
| FENG Jinsong |
Tarim Oilfield Company, Petrochina, Xinjiang Korla , China |
| YUE Liangwu |
Tarim Oilfield Company, Petrochina, Xinjiang Korla , China |
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| Abstract: |
| The work aims to solve the severe corrosion on the liquid phase outlet pipeline flange for a separator of a gas field in the western region. An analysis was conducted to ascertain the causes of the flange corrosion. This analysis involved macroscopic morphology observation, non-destructive testing, chemical composition analysis, metallographic structure analysis, mechanical performance testing, microscopic morphology observation of the corrosion area, phase analysis of corrosion products, and corrosion electrochemical experiments. The findings suggested that the A105 flange and the 316L sealing ring materials were highly susceptible to galvanic corrosion. In conclusion, galvanic corrosion is the primary contributor to the severe corrosion observed on the flange surface. Moreover, inadequate venting of the liquid phase pipeline prior to shutdown also leads to liquid accumulation at the flange base, resulting in compounded waterline corrosion at the gas-liquid interface. Based on the identified causes of flange corrosion, specific anti-corrosion recommendations are proposed. |
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