无损检测技术在城市燃气管道的应用

Application of Non-destructive Testing Technology in Urban Gas Pipelines

从钢质管道检测和PE管道检测两方面,对比分析了超声相控阵、数字射线、超声导波、微波等无损检测技术的特点以及在城市燃气管道的应用场景。通过实验验证了超声相控阵和数字射线检测技术对PE管道电熔接头和热熔接头的检测效果。超声相控阵检测技术可以用于钢质管道焊缝检测和PE管道电熔接头检测,可有效检测出钢质管道焊缝和PE管道电熔接头中各类缺陷,可以检测出PE管道热熔接头中的金属物和非金属物夹杂缺陷。数字射线检测技术可以有效检测出钢质管道焊缝中各种缺陷,可以检测出PE管道电熔接头和热熔接头中金属物夹杂缺陷。超声导波检测技术能够进行快速、长距离钢质管道管体缺陷检测,但无法有效识别焊缝中的缺陷。微波技术能够有效检测出PE管道热熔接头中的未充分熔合、夹杂等缺陷,相关标准的制定将有效推进微波检测技术的使用。

The characteristics of non-destructive testing technologies such as ultrasonic phased array,digital ray,ultrasonic guided wave and microwave,etc,as well as their application scenarios in urban gas pipelines are analyzed from the two perspectives of steel pipeline testing and PE pipeline testing.The testing effect of ultrasonic phased array and digital ray testing technology on PE electrofusion joints and heated-tool fusion joints is verified through experiments.The ultrasonic phased array testing technology can be used for the detection of steel pipeline welds and PE pipeline electrofusion joints.It can effectively detect various defects in steel pipeline welds and PE pipeline electrofusion joints,and can detect metal and non-metallic inclusion defects in PE pipeline heated-tool fusion joints.Digital ray testing technology can effectively detect various defects in steel pipeline welds,as well as metal inclusion defects in PE pipeline electrofusion joints and heated-tool fusion joints.Ultrasonic guided wave testing technology can quickly detect the defects of long distance steel pipelines,but it cannot effectively identify defects in welds.Microwave technology can effectively detect defects such as incomplete fusion and inclusions,etc,in PE heated-tool fusion joints,and the development of relevant standards will effectively promote the use of microwave testing technology.