Pipeline Intelligent Detection - Magnetic Flux Leakage
Pig flow in the pipe, steel tube defects due to corrosion at far less than the permeability of the magnetic permeability of steel, steel is magnetized under the action of external magnetic field. When the tube is no defect, most of magnetic field lines through the pipe, uniform distribution of magnetic field lines at this time. When the pipe internal defects, magnetic lines bent, and some of the surface magnetic field lines leaking out of pipe. Steel surface escape detection by magnetic flux leakage, which can effectively be both inside and outside wall of the corrosion, cracks, weld, and the location of perforation and other defects. According to oil and gas industry standards (SY / T5922-2003) should be regularly on the pipe age, level of position, stress level, leakage history, the transmission medium, and evaluate the impact of environmental factors to determine the type of pipeline repair and service life.
Characteristics and use of this method
1, can be lost in case of non-stop inner and outer wall of the pipeline corrosion for precise positioning
2, high efficiency, one can detect more than three hundred kilometers. Continuous and can be detected on the long-distance pipeline
3, high accuracy, by computer processing pipeline can get all of the flaw signals
4, for ∮ 159mm - ∮ 1200mm variety of steel pipes
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