利用不去除在役管道保温层的检测方法,在管道内部有介质、外部有包装(防腐保温层)的情况下,对物质进行分类剔除。在了解在役管道X射线检测系统各部分组成基础上对在役管道进行结构解剖,了解管道材料及保温层的材料组成和结构性质。依据按有效原子序数将物质分类的原理,通过一定的计算,找到物质分类识别的边界物质,制定相应的实验方案,采集数据并进行曲线拟合。得到物质分类识别的边界曲线和数学模型。 Use not remove the in-service pipeline insulation testing methods, the media inside the pipeline, the external packaging (anti-corrosion insulation layer), the material is removed from the classification. On the basis of understanding the composition of each part of in-service pipeline X-ray detection system, the structure of in-service pipeline is anatomized and the material composition and structural properties of pipeline material and thermal insulation layer are understood. According to the principle of classifying substances by effective atomic number, we can find the boundary substances identified by classification through some calculation, make corresponding experimental schemes, collect data and curve fit. The boundary curves and mathematical models of material classification are obtained.