低流速管道漏磁检测解决方案探讨
Discussion on Magnetic Flux Leakage Inspection Solution for Low Flow Rate Pipeline

智能检测目前主要是采用漏磁检测技术，其原理是利用强磁场，在金属管壁上产生磁感线，通过记录磁感线形状，分析管道本体金属的各种类型变化，利用已有数据模型，分析金属变形所属缺陷种类，同时还可分析管体外接金属情况。为获取可靠数据，需保持检测器的平稳运行，通常根据管径(检测器)大小，要求同时满足合理的运行压力和流速范围，否则，将造成数据降级或丢失。有些管线由于气量低，导致流体流速低于低限，造成某些重要管线无法开展漏磁检测，本文就该问题进行了探讨，并利用pipesim进行模拟在具备计量及放空的条件下，开展漏磁检测所需的参数，可以实现部分低流速管线漏磁检测的需要。
At present, magnetic flux leakage inspection technology is mainly used for detection. Its principle is to use strong magnetic field to generate magnetic induction line on the metal pipe wall. By recording the shape of the magnetic induction line, various types of changes in the metal of the pipe body are analyzed. The existing data model is used to analyze the defect types of metal deformation. At the same time, the metal connection outside the pipe can also be analyzed. In order to obtain reliable data, it is necessary to maintain the stable operation of the detector. Generally, according to the pipe diameter (detector) size, it is required to meet the reasonable operating pressure and flow rate range at the same time, otherwise, it will cause data degradation or loss. Due to the low gas volume of some pipelines, the fluid flow rate is lower than the low limit, which makes some important pipelines unable to carry out magnetic flux leakage inspection. This paper discusses this problem and uses pipesim to simulate the parameters required for magnetic flux leakage inspection under the conditions of gauge device and vent system, which can meet the needs of magnetic flux leakage inspection of some low flow rate pipelines.