The discharge coefficient of rupture disk cascaded with safety valve has not been reported in domestic standards and literatures. A cascaded combination discharge device of rupture disk and safety valve was established. Both the flow capacity and discharge coefficient were studied in different pipe lengths between rupture disk and safety valve and in different bursting pressures. The orifice meter was a-dopted to measure the flow capacity. The reverse acting scored bursting disk and convention^ spring -loaded pressure relief valve were selected. The discharge experiments of single safety valve were conducted as opposite experiments. The results indicate that, when safety valve acts alone, the discharge coefficient gets smaller as pipe length becomes larger,with the minimum value of 0.9. Whereas,when the rupture disk cascaded with safety valve acts,the discharge coefficient varied from 0.78 to 0.84 and the combination correction coefficient from 0.876 to 0.912.%爆破片及安全阀串联组合泄放系数测定在国内标准及文献中还未见报道.建立了爆破片与安全阀串联组合泄放特性试验装置,研究了爆破片与安全阀之间不同接管长度、不同泄放压力下组合泄放装置泄放量及泄放系数.选用孔板流量计测量介质流量,选用反拱刻槽型爆破片及弹簧全启式安全阀.以单独安装安全阀泄放试验作为对比试验.结果表明,单独安装安全阀时,随着接管长度增加,泄放系数稍变小,但最小值为0.9.试验所用批次的爆破片和安全阀串联组合时,泄放系数在0.78～0.84之间,组合校正系数Kc在0.876 ～0.912范围内.
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