Analysis of Bolt Pretension of LNG Ultra-Low Temperature Ball Valve

doi:10.12141/j.issn.1000-565.200247

Journal of South China University of Technology (Natural Science Edition) ›› 2021, Vol. 49 ›› Issue (7): 142-148.doi: 10.12141/j.issn.1000-565.200247

Special Issue: 2021年能源、动力与电气工程

• Power & Electrical Engineering • Previous Articles

Analysis of Bolt Pretension of LNG Ultra-Low Temperature Ball Valve

LI Shuxun¹ YIN Huiquan¹ ZHAO Minjie² YANG Lingxia¹ LIU Taiyu¹

1． School of Petrochemical Engineering∥ Machinery Industry Pump and Special Valve Engineering Research Center， Lanzhou University of Technology，Lanzhou 730050，Gansu，China; 2． Shanghai High and Medium Pressure Valve Co．，Ltd．，Shanghai 201401，China

Received:2020-05-18 Revised:2020-12-02 Online:2021-07-25 Published:2021-07-01
Contact: 李树勋 ( 1973-) ，男，硕士，教授，主要从事特殊阀门研究。 E-mail:gdlishuxun@126.com
About author:李树勋 ( 1973-) ，男，硕士，教授，主要从事特殊阀门研究。
Supported by:
Supported by the National Natural Science Foundation of China ( 51569012)

Abstract

Abstract: In order to study the effect of temperature on the bolt pretension of flange structure，the bolt pretension and sealing conditions of flange in liquified natural gas ( LNG) ultra-low temperature ball valve at different temperatures were analyzed by ANSYS finite element software，and the pretension states of bolt materials with different linear expansion coefficients at room temperature and low temperature were compared． The results show that when the bolt material is B8M and XM-19，the preload force increases with the decrease of temperature，and the pretension under the low temperature conditions increases by 24. 93% and 6. 28% respectively compared with normal temperature; when the bolt material is Inconel625，the pretension decreases with the decrease of temperature，and the pretension under the low temperature condition decreases by 26. 39% compared with normal temperature． At the same time，the variation of the sealing specific pressure of the metal spiral wound gasket with temperature exhibits the same trend with the bolt pretension．

Key words: liquified natural gas, flange, bolt, pretension, linear expansion coefficient, seal

CLC Number:

TH131. 3

LI Shuxun, YIN Huiquan, ZHAO Minjie, et al. Analysis of Bolt Pretension of LNG Ultra-Low Temperature Ball Valve[J]. Journal of South China University of Technology (Natural Science Edition), 2021, 49(7): 142-148.

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Analysis of Bolt Pretension of LNG Ultra-Low Temperature Ball Valve

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