Magnetic flux loss tests steel structures for metal loss due to corrosion. A magnetized structure is tested for magnetic field leaks, indicating areas of corrosion. Magnetic flux dispersion tools detect damage in pipelines by traveling inside them and collecting real-time data. The device consists of a magnetizer and electronic can with sensors to detect leaks. High-resolution devices provide more detailed and reliable information, preventing unnecessary excavation and draining of steel tanks.
Magnetic flux loss typically refers to a method of testing steel structures for metal loss caused by corrosion. In this type of test method, the structure is magnetized and a detector is used to detect areas where the magnetic field “leaks”. This leak may indicate areas where pitting or corrosion is present. A cartographic record of the leak field is made in order to identify any damaged areas of the steel structure.
Testing steel pipelines using a magnetic flux dispersion tool is usually done by placing the device inside the pipe. The instrument can then travel inside the pipeline together with any liquid or gaseous product that the pipe could be carrying at that moment. As the device travels down the pipeline, advanced on-board electronics collect real-time data to accurately detect any damage it detects. When the results are recorded, technicians are able to pinpoint the exact type of damage found and its location in case some type of repair is needed.
A typical magnetic flux leak test device consists of two bodies which are commonly referred to as the magnetizer and electronic can. The body of the magnetizer contains strong magnets and brushes along with sensors used to detect leaks. As the device travels along the steel structure, the magnets and brushes form a kind of magnetic circuit with the steel, while sensors monitor this circuit for disruptions. Some type of corrosion or damage to the steel structure usually causes circuit breaks.
The test fixture electronics can typically contain several pieces of equipment that are used to help pinpoint the exact location of the magnetizer body. At the rear of this device are a speedometer and odometer used to measure both the speed of the magnetizer and the distance traveled. Many times, a Global Positioning System (GPS) tracking device is also used to further locate the device.
Magnetic flux leakage testing is sometimes performed using a high-resolution device that contains more sensors than the standard version. High resolution tests usually provide more detailed and reliable information. The superior information gained from this form of testing often prevents unnecessary excavation of steel pipelines and the draining of steel tanks for further inspection.
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