Mr. Jian Gao Profile

Jian Gao

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Proceedings Article | 6 February 2024 Paper

Failure analysis of wellhead to desander flange

Hao Qian, Jian Gao, Mo He, Dong Lin, Wenjie Cheng, Wenwang Ai, Yi Xie

Proceedings Volume 12979, 129793K (2024) https://doi.org/10.1117/12.3015135

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A wellhead to desander flange failed. In this paper, the causes of flange failure were systematically analyzed by chemical composition analysis, hardness test, scanning electron microscopy and energy spectrum analysis, XRD corrosion composition analysis and macroscopic morphology analysis. The results show that the hardness of the flange meets the standard requirements; the chemical composition meets the standard requirements; the main elements in the corrosion pit are C, O, Fe and a small amount of S elements. XRD experimental results show that the corrosion products in the corrosion pits are mainly FeCO₃, no iron sulfide is found, and it can be judged that the CO₂ in the transport medium is the main cause of flange corrosion. The presence of a large amount of CO₂ in the transport medium was detected, thus providing further evidence of CO₂ corrosion. There is no H2S in the conveying medium, and the S element detected in the corrosion pit may be that the S element in the flange gradually precipitates to the surface of the corrosion pit during the corrosion process of the flange; Based on the macroscopic characteristics of the corrosion pits and the corrosion products, it can be inferred that the flanges were not tightly fitted with the wound gaskets during the installation process and that gaps existed, which led to the accumulation of moist CO₂ gas there and caused the corrosion of the flanges. The results of the study have a positive effect on eliminating similar defects as well as eliminating safety hazards.

Proceedings Article | 9 March 2023 Paper

Failure analysis of a gas mine outfall pipeline in Sichuan

Pengcheng Li, Dong Lin, Jian Gao, Chang Liu, Mingnan Sun, Haochen Wu

Proceedings Volume 12600, 126001J (2023) https://doi.org/10.1117/12.2674003

KEYWORDS: Corrosion, Pipes, Failure analysis, Carbon monoxide, Statistical analysis, Iron, Mining, 3D modeling, Manganese, Magnesium

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A failure occurred during the service period of the gas mine outfall pipeline in Sichuan Province, and a perforation was realized in the pipe section at 9 o'clock and multiple corrosion pits at 12 o'clock. In order to find out the cause of the failure, a hardness test was performed on the pipe sample to determine the mechanical properties of the pipe, and a metallographic analysis was performed on the pipe to determine the pipe tissue properties. The tube sample was scanned by electron microscope and analyzed by energy spectrum, and it was found that the cause of perforation and multiple corrosion pits in the tube sample was due to the corrosion of CO₂.

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