Failure Analysis of the Fluorine Rubber Sealing Ring Used in Acidic Gas Fields

G. Q. Qi; D. T. Qi; H. X. Yan; B. Wei; H. B. li; N. Ding; X. D. Shao; D. N. Zhang; X. H. Cai

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Paper

Failure Analysis of the Fluorine Rubber Sealing Ring Used in Acidic Gas Fields

In Proceedings of the International Workshop on Materials, Chemistry and Engineering IWMCE - Volume 1, 651-657, 2018 , Xiamen, China

Authors: G. Q. Qi ¹ ; D. T. Qi ² ; H. X. Yan ³ ; B. Wei ² ; H. B. li ² ; N. Ding ² ; X. D. Shao ² ; D. N. Zhang ² and X. H. Cai ²

Affiliations: ¹ State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, School of Natural and Applied Science and Northwestern Polytechnical University, China ; ² State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials and CNPC Tubular Goods Research Institute, China ; ³ School of Natural and Applied Science and Northwestern Polytechnical University, China

Keyword(s): fluorine rubber; sealing ring; fatigue aging; H2S

Abstract: The failure of fluorine rubber sealing ring occurs when it is used in the sulfur condition after one year. By visual observation, there are some cracks and the color changed to black from brown near the location of the contact delivery medium. In order to identify the cause of the failure, the physical properties, structure and composition were tested and compared with the same batch of the rings but without using.The results showed that the hardness and density of the material were increased because of gas permeation. It is evidenced by the microstructural observation, which shows that there are holes in the material near the transport medium. The specimens were characterized by FT-IR and XPS, respectively. The results show that the three-dimensional network structure of the ring is destroyed and the peak strength of -CF2 and -CF is weakened while the CH3, -CH2 and –C=O increase by the action of external stress and gas permeation. As a result of comprehensive evaluation, the reason of sealing ring failure is fatigue aging during the long-termservice life. The gas permeation leads to the destruction of the network structure, and accelerating the aging process. (More)

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Paper citation in several formats:

Qi, G.; Qi, D.; Yan, H.; Wei, B.; li, H.; Ding, N.; Shao, X.; Zhang, D. and Cai, X. (2018). Failure Analysis of the Fluorine Rubber Sealing Ring Used in Acidic Gas Fields. In Proceedings of the International Workshop on Materials, Chemistry and Engineering - IWMCE; ISBN 978-989-758-346-9, SciTePress, pages 651-657. DOI: 10.5220/0007442906510657

@conference{iwmce18,
author={G. Q. Qi. and D. T. Qi. and H. X. Yan. and B. Wei. and H. B. li. and N. Ding. and X. D. Shao. and D. N. Zhang. and X. H. Cai.},
title={Failure Analysis of the Fluorine Rubber Sealing Ring Used in Acidic Gas Fields},
booktitle={Proceedings of the International Workshop on Materials, Chemistry and Engineering - IWMCE},
year={2018},
pages={651-657},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007442906510657},
isbn={978-989-758-346-9},
}

TY - CONF

JO - Proceedings of the International Workshop on Materials, Chemistry and Engineering - IWMCE
TI - Failure Analysis of the Fluorine Rubber Sealing Ring Used in Acidic Gas Fields
SN - 978-989-758-346-9
AU - Qi, G.
AU - Qi, D.
AU - Yan, H.
AU - Wei, B.
AU - li, H.
AU - Ding, N.
AU - Shao, X.
AU - Zhang, D.
AU - Cai, X.
PY - 2018
SP - 651
EP - 657
DO - 10.5220/0007442906510657
PB - SciTePress