Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (8): 120 doi: 10.1007/s41365-018-0457-2

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Stress and thickness calculation of a bolted flat cover with double metal sealing rings

Xiao-Yan Wang 1,2 • Shi-Feng Zhu 1 • Xiao Wang 1 • Xiao-Chun Zhang 1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Contact: Xiao Wang E-mail:wangxiao@sinap.ac.cn
  • Supported by:

    The study was supported by the ‘‘Strategic Priority Research Program’’ of the Chinese Academy of Sciences (No. XDA02010000).

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Xiao-Yan Wang, Shi-Feng Zhu, Xiao Wang, Xiao-Chun Zhang. Stress and thickness calculation of a bolted flat cover with double metal sealing rings.Nuclear Science and Techniques, 2018, 29(8): 120     doi: 10.1007/s41365-018-0457-2

Abstract:

The design of a bolted flat cover is extremely important for the structural integrity of pressure vessels. The present design codes provide the thickness calculation equations for a bolted flat cover with single metal gasket. However, the rules for a bolted flat cover with double metal sealing rings are not developed to date. In the study, a new thickness calculation equation for the bolted flat cover with double metal sealing rings is proposed. First, the theoretical stress solution for bolted flat cover with the double metal sealing rings is obtained, based on the theory of simply supported circular plate and then verified using the results from finite element analyses. The results indicate that the influence of double metal sealing ring on the stress of the flat cover is more serious compared to single metal gasket. Second, a more accurate and reasonable equation is proposed to calculate the thickness of bolted flat cover with double metal sealing rings based on the derived theoretical equations of maximum stress. Finally, the influence of linear load and the spacing between rings on the thickness are discussed. Subsequently, a few suggestions are provided to design low-pressure or atmosphere pressure vessels. The study provides a theoretical foundation to develop design codes of pressure vessels in nuclear reactors.

Key words: Thickness calculation equation, Pressure vessel, Bolted flat cover, Double metal sealing rings, Design codes