Fast screening for detection of heavy corrosion in insulated pipe using pulsed eddy current

绝缘钢管和钢结构在石油和天然气管道、石化工业中工厂的平衡、建筑物的钢支撑结构和大型液体储存容器等大量应用中出现。绝缘金属管道、压力容器和结构部件的退化可能是以下原因造成的：1)在现有的运输介质中产生的内部腐蚀过程；2)外部来源**，如曝气水或含有腐蚀性污染物的水，这些污染物已引入厚（达51毫米）**绝缘屏障。其他可能发生腐蚀的区域包括地上碳钢储罐，**绝缘层厚度可达6至10毫米。目前的超声波检测技术只能在去除绝缘层后测量局部壁厚。PEC已经证明有能力在大型发射装置中进行导电铁磁性材料的检测。该项目将：1)开发**脉冲涡流（PEC）技术，包括针对**绝缘导电管在大升力下的一般腐蚀进行快速检测而优化的探头设计。2)展示这种技术的能力和局限性。3)建立PEC对壁厚、起升和渗透率变化响应的理论模型，并通过实验室测量验证这些模型。4)针对目标检测条件优化探头设计，并利用开发的模型协助识别可能影响测量精度的参数。这项工作对于检测服务提供商来说非常重要，因为他们目前无法** *在没有昂贵且耗时的绝缘拆除的情况下对管道进行本地检测。开发有助于生命周期管理和提高化学加工、石油和天然气以及液体运输和密封行业腐蚀条件评估能力的技术，将**支持加拿大工业在这些领域的业绩。HQP将接受培训，以进入这个快速增长的在职检验领域

Insulated pipe and steel structures arise in a large number of applications including oil and gas pipeline,**balance of plant in the petrochemical industry, steel support structures for buildings and large liquid storage**containers. Degradation of insulated metal piping, pressure vessels and structural components may be the**result of 1) internal corrosive processes, arising within the existing transport medium or 2) external sources**such as aerated water or water with corrosive contaminants that have been introduced into thick (up to 51 mm)**insulating barriers. Other areas where corrosion may occur include above ground carbon steel storage tanks,**where insulating layers can be 6 to10 mm thick. Current ultrasonic inspection technology is only capable of**localized wall thickness measurements after insulation removal. PEC has a demonstrated capability to perform**inspection in the presence of conducting ferromagnetic materials at large lift-offs. This project will: 1) Develop**pulsed eddy current (PEC) technology, including probe design that is optimized for rapid inspection of**insulated electrically conducting pipe at large lift-off for general corrosion. 2) Demonstrate capabilities and**limitations of such technology. 3) Develop theoretical models of the response of PEC to changing wall**thickness, lift-off and permeability and validate these against laboratory measurements. 4) Optimize probe**design for the target inspection conditions and assist in identifying parameters that may affect measurement**accuracy using the developed models. This work will be important to inspection service providers who cannot**currently perform local inspection of pipe without expensive and time consuming removal of insulation.**Development of technologies that will assist in lifecycle management and improve assessment capability for**conditions of corrosion in chemical processing, oil and gas and liquid transport and containment industries will**support the performance of Canadian industry in these areas. HQP will be trained to enter the workforce in this**rapidly growing area of in-service inspection.**