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介绍了船用LNG管线运输中超低温球阀的结构特点、工作性能及安全运行的基本条件,分析了超低温球阀阀体深冷、工作、常温水压试验工况下的结构应力和疲劳强度寿命,同时分析了温度、应力集中、峰值应力等敏感参数对低温下阀体安全系数的影响,给出了LNG超低温球阀在不同压力、温度等载荷作用时的强度、寿命、安全系数和损伤系数及其阀体强度、寿命的设计要求和方法。
The structural characteristics, working performance and basic conditions for safe operation of cryogenic ball valve for shipping LNG pipeline are introduced. The structural stress and fatigue life of cryogenic ball valve body under cryogenic, working and normal temperature hydrostatic test are analyzed. Simultaneously, The influence of temperature, stress concentration, peak stress and other sensitive parameters on the safety factor of valve body at low temperature is given. The strength, life span, safety factor and damage coefficient of LNG cryogenic valve under different pressure, temperature and other loads, Strength, life expectancy of the design requirements and methods.