![]() ![]() digging up the pipe to verify what the problem is). The high-resolution MFL-ILIs allow more reliable and accurate identification of anomalies in a pipeline, thus, minimizing the need for expensive verification excavations (i.e. The more advanced versions are referred to as "high-resolution" because they have a large number of sensors. MFL-ILIs detect and assess areas where the pipe wall may be damaged by corrosion. The type of ILI we are interested in here, and the one that has been in use the longest for pipeline inspection, is the magnetic flux leakage inline inspection tool (MFL-ILI). In-line-Inspection (ILI) tools are built to travel inside a pipeline and collect data as they go. ![]() There are many methods of assessing the integrity of a pipeline. Analysts interpret the chart recording of the leakage field to identify damaged areas and to estimate the depth of metal loss. In an MFL (or Magnetic Flux Leakage) tool, a magnetic detector is placed between the poles of the magnet to detect the leakage field. At areas where there is corrosion or missing metal, the magnetic field "leaks" from the steel. The basic principle is that a powerful magnet is used to magnetize the steel. Magnetic flux leakage ( TFI or Transverse Field Inspection technology) is a magnetic method of nondestructive testing that is used to detect corrosion and pitting in steel structures, most commonly pipelines and storage tanks. ( Learn how and when to remove this template message) ( March 2015) ( Learn how and when to remove this template message) See Wikipedia's guide to writing better articles for suggestions. This article's tone or style may not reflect the encyclopedic tone used on Wikipedia. ![]()
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