无损试验. 采用导波检测与轴向传播对地上管线及设备管道进行长距离检测

[中文适用范围]： 本国际标准规定了一种使用引导超声波对整个圆周管段进行轴向传播的碳钢和低合金钢地上管道和工厂管道的远程测试方法，以检测腐蚀或侵蚀损坏。 导波测试 (GWT) 方法可以快速检查地上管道、工厂管道和套管道路交叉口，对可能的腐蚀和侵蚀区域进行定性筛选和定位。 GWT 通常在运行的管道系统上执行。 本国际标准适用于下列类型的管道： a) 地上涂漆管道； c) 涂漆的工厂管道； b) 地上绝热管道； d) 工厂管道保温。 注：具有外部套管（无沥青或塑料涂层）的道路交叉口内的管道部分是埋地管道的特殊情况，其中管道外径上没有土壤压力。 本国际标准适用于这些有套管的道路交叉口。 由于复杂性增加，未包含在上面列表中的其他类型的管道需要专门的方法。 [外文原描述]： ISO 18211:2016 specifies a method for long-range testing of carbon and low-alloy steel above-ground pipelines and plant piping using guided ultrasonic waves with axial propagation applied on the entire circumferential pipe section, in order to detect corrosion or erosion damage. The guided wave testing (GWT) method allows for fast inspection of above-ground pipelines, plant piping and cased road crossings, giving a qualitative screening and localization of probable corroded and eroded areas. GWT is typically performed on operating piping systems. ISO 18211:2016 is applicable to the following types of pipes: a) above-ground painted pipelines; b) above-ground insulated pipelines; c) painted plant piping; d) insulated plant piping. NOTE Pipe sections within road crossings with external casings (without bitumen or plastic coating) are a special case of buried pipe where there is no soil pressure on the OD of the pipe. ISO 18211 :2016 applies to these cased road crossings. Other types of pipes not included in the above list need dedicated approaches due to increased complexity.