Research On The Oil Pipeline Of The Magnetic Flux Leakage Testing Technology

Along with the steel pipe in oil and gas, chemical industry, metallurgy industry and so on the application of the steel pipe production quality also put forward higher requirement. Steel pipe any defects are the hidden danger of accident, especially in underground and maritime transport of oil and gas pipelines, bear inner high-pressure gas or liquid, undergo various corrosion and structural deformation, stress destruction to environment would be very bad conditions caused damage cause pipe ruptured pipeline, leak, the economic loss caused very large, also can to personal safety and natural environment caused by the destruction of inestimable. So international researchers has been committed to defect inspection of pipeline to assess research.This article mainly studied the pipeline small norms magnetic flux leakage detection technology, analyzes the principle of magnetic flux leakage testing, tube body general defect form and causes, this paper introduces the use of magnetic flux leakage equipment calibration tube method and the technical parameters. Various influence factors of the detection sensitivity of magnetic flux leakage detection accuracy has a great influence, so did a lot of experiments are analyzed. Magnetic field experimental proof the weak, the tube body coating thickness, surface roughness, test the speed of the car, when all of depth and dimension of defects detection sensitivity has great influence, so in actual testing process, must pay attention to these factors so as to improve the accuracy of the test results.Magnetic flux leakage detection method can be used in the detection of outer wall and inner steel various defects of the surface, due to different locations, in steel external detect trauma and internal differences signal is present sensitivity by testing specimens, resulting in evaluation, have a lot of uncertainty. Therefore, it is necessary to first make sure that hurt position, and then to give a precise, damage degree aspects of evaluation. Therefore, intradermic injury and trauma recognition is to realize the precise evaluation injured scale first step. So this paper analyzed the positioning defects by positioning experiments, methods of magnetic flux leakage parking equipment can make more efficient found defect location. In the detection, verified the positioning accuracy magnetic flux leakage equipment.