Tank Floor Scanning

At T.I.S. we can provide you with Tank bottom scan based on two technologies. Magnetic Flux Leakage MFL and Low Frequency Electromagnetic Technique LFET. Service will be done by personnel certified under European and UK standards.

Magnetic flux leakage MFL is a magnetic method of nondestructive testing that is used to detect corrosion and pitting in tank floors. The basic principle is that a powerful magnet is used to magnetize the steel. At areas where there is corrosion or missing metal, the magnetic field “leaks” from the steel. In an MFL tool, a magnetic detector is placed between the poles of the magnet to detect the leakage field. Analysts interpret the chart recording of the leakage field to identify damaged areas and to estimate the depth of metal loss.

Low Frequency Electromagnetic Technique LFET is a technique by which changes in the wall thickness of carbon steel storage-tank floor-plates are detected. The technique operates by passing a low frequency magnetic field into the plate and using scanner-mounted pickup coils to detect the induced AC magnetic field in the plate material. In the presence of wall loss and pitting, a measurable distortion is introduced to the induced field that can be detected using the pickup coils on the scanner. By using low frequencies, the penetration of the magnetic field is more uniform throughout the plate thickness and defects on both the top and bottom sides of the plate can readily be seen.

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