山地小口径管道的非接触式磁力检测

Non-contact magnetic detection of mountain small-diameter pipelines

为了验证非接触式磁力检测技术的有效性,对山地小口径天然气长输管道进行弱磁检测,得到管道上方3个方向的磁感应强度梯度∂B_(x),∂B_(y),∂B_(z),通过定性和定量分析识别出了磁异常管段,并确定了其应力风险等级。开挖后,利用金属磁记忆检测技术和超声测厚技术对非接触式磁力检测的结果进行了验证。工程应用结果表明,在非开挖条件下,非接触式磁力检测技术能够有效识别山地小口径管道的应力集中位置并分析其损伤等级,提高了管道的检测效率,是一种科学、有效的检测方法。

In order to verify the effectiveness of the non-contact magnetic detection of the small-caliber natural gas long-distance pipeline in the mountain area,magnetic induction intensity gradients ∂B_(x),∂B_(y),∂B_(z) in the three directions above the pipeline were obtained.The stress risk level was determined,and the results of non-contact magnetic testing were verified by excavation using metal magnetic memory testing technology and ultrasonic thickness measurement technology.Engineering application result shows that under non-excavation conditions,noncontact magnetic detection technology can effectively identify the stress concentration location of mountain smalldiameter pipeline and analyze its damage level,improving pipeline inspection efficiency.Therefore,it is a scientific and effective detection method.