排烟风管耐火极限检测报告

inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">排烟风管耐火极限检测合格要求：
inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">试件耐火极限以试样丧失耐火完整性或耐火隔热性的时间确定;
inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">1.试件出现以下任一限定情况即丧失耐火完整性：
inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">a)棉垫被点燃;
inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">b)背火面出现火焰并持续时间超过10s;
inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">c)试件背火面出现贯通至试验炉内的缝隙，直径6mm±lmm的探棒可以穿过缝隙进入试验炉内且探棒可以沿缝徐长度方向移动不小于150mm;
inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">d)试件背火面出现贯通至试验炉内的缝隙，直径25mm±0.2mm的探棒可以穿过缝隙进入试验炉内;
inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">2.试件出现以下任一限定情况即丧失耐火隔热性：
inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">a)试件背火面平均溟度温升超过初始平均温度140℃。
inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">b)试件

inkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "PingFang TC", "PingFang HK", "Microsoft Yahei", "Microsoft JhengHei"; white-space: pre-wrap; background-color: rgb(255, 255, 255);">背火面任一点位宣的混度混升超过初始平均温度180℃。