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Sealing Structural Design and Sealing Performance Analysis for Cylindrical Pipe Threaded Connection

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Abstract

In this paper, a double primary sealing structure consisting of tapered surface to tapered surface and cylindrical surface to spherical surface is proposed. The changes of contact stress and contact length on the primary sealing surface of three main seal structure forms including the double primary sealing structure, the cone-to-cone sealing structure, and the sphere-to-cylinder sealing structure are analyzed by finite element analysis at make-up, tension, compression, tension and internal pressure, tension, internal and external pressure. The changing laws of sealing performance of three kinds of sealing structures with load are obtained. The analysis results indicate that the cylindrical pipe threaded connection with a double primary sealing surface shows more uniform contact stress. With increasing the contact length, peak contact stress under different working conditions decreases, compared with the cylindrical pipe threaded connection with a single primary sealing surface. The full-scale test results show that the mechanical and sealing performance of the cylindrical pipe threaded connection with a double primary sealing surface meets the application requirements.

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu, China

    Li Mo, Hang Chen & Lian Tu

  2. Sichuan Baoshi Machinery Special Vehicle Co., Ltd, Guanghan, China

    Cheng Tian

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  1. Li Mo
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  2. Hang Chen
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  3. Lian Tu
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  4. Cheng Tian
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Correspondence to Li Mo.

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Mo, L., Chen, H., Tu, L. et al. Sealing Structural Design and Sealing Performance Analysis for Cylindrical Pipe Threaded Connection. J Fail. Anal. and Preven. 22, 1657–1668 (2022). https://doi.org/10.1007/s11668-022-01452-3

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  • DOI: https://doi.org/10.1007/s11668-022-01452-3

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