Sealing reliability of LNG shut-off valve based on ultra-low temperature experiment
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摘要: 基于超低温实验获得的LNG用截止阀的填料温度和泄漏率数据，使用基于有限元分析的新型泄漏分析方法计算阀门密封面间隙，考虑多种影响因素评估超低温截止阀的泄漏情况，并识别潜在的泄漏危险点。应用单因素分析法识别x方向位移、阀杆螺纹预紧力、密封面摩擦系数、合金热膨胀系数和弹性模量等5个与阀门泄漏相关的影响因子，利用6-sigma分析法探究其对泄漏率的灵敏度，并给出该尺寸截止阀的泄漏失效分布情况，直观展示导致阀门失效的影响因子。Abstract: Based on the filling temperature and leakage rate data of LNG shut-off valves obtained from ultra-low temperature experiment, a new leakage analysis method based on finite element analysis is used to calculate the valve sealing surface clearance. Multiple influencing factors are considered to evaluate the leakage situation of ultra-low temperature shut-off valves and identify potential leakage hazards. The single factor analysis method is applied to identify five influencing factors related to valve leakage, including x-direction displacement, stem thread preload, sealing surface friction coefficient, alloy thermal expansion coefficient, and elastic modulus. The sensitivity of these factors to the leakage rate is explored using the 6-sigma analysis method, the distribution of the leakage failure for this size of cut-off valve is provided, and the influencing factors that cause valve failure is visually demonstrated.
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Key words:
- LNG /
- shut-off valve /
- ultra-low temperature experiment /
- sealing surface /
- leakage /
- reliability /
- 6-sigma
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