BS ISO 18211:2016规定了碳钢和低合金钢的长期试验方法 采用轴向传播的引导超声波的地上管道和工厂管道 在整个圆周管段上，以检测腐蚀或侵蚀损坏。导波测试（GWT）方法允许快速检查地面管道、工厂和设备 管道和套管道路交叉口，对可能的腐蚀进行定性筛选和定位 以及侵蚀区域。GWT通常在运行的管道系统上进行。本国际标准适用于以下类型的管道:地上涂漆管道；地上绝缘管道；涂漆的工厂管道；绝缘设备管道。注:带有外部套管（无沥青或塑料涂层）的道路交叉口内的管段 埋地管道的一种特殊情况，管道外径上没有土压力。这个国际标准 适用于这些有外壳的道路交叉口。上述清单中未包括的其他类型的管道需要专用方法，因为 复杂性交叉引用:ISO 9712购买本文件时提供的所有当前修订版均包含在购买本文件中。

BS 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.This International Standard is applicable to the following types of pipes:above-ground painted pipelines;above-ground insulated pipelines;painted plant piping;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. This International Standard applies to these cased road crossings.Other types of pipes not included in the above list need dedicated approaches due to increased complexity.Cross References:ISO 9712All current amendments available at time of purchase are included with the purchase of this document.