Magnetic Flux Leakage

Magnetic Flux Leakage is an established technique delivering detailed corrosion screening of storage tank bottoms and piping in a short timeframe.

Large steel structures can suffer from corrosion in areas not usually visible to the eye. Testing every area of an asset, such as a storage tank, requires a fast, complete method that still provides a reliable result. Ultrasonic testing provides high-resolution results, but cannot always give a reading on corroded areas. Radiography is only possible when an object can be assessed from opposing sides.

Our solution
Applus RTD's Magnetic Flux Leakage test service investigates disturbance of the magnetic fields around a steel component damaged by metal loss through corrosion. By using appropriate sensors, the amount of metal lost can be indicated and evaluated.

We have been involved in MFL testing since the method was first applied in storage tanks in the late 1980s. Since then, the capabilities of the MFL system have been supplemented by a full suite of services for inspecting all parts of storage tanks, including measurements to check settlement, piping, roofs, supports, heating coils, etc.
In the meantime, MFL solutions also exist for piping and other large components. Please contact us for specifics about other MFL applications.
MFL is also one of the main inspection methods for pipelines, generally in the form of an In-Line Inspection (ILI) tool. While Applus RTD does not run MFL ILI tools itself, we are very experienced in the interpretation and follow-up relating to these inspections.

MFL offers a compromise between accuracy and performance and is the most widely accepted method for testing storage tank floors. It allows equipment to return to operation faster and with more confidence. The comprehensive results of MFL inspections will be reported and can be supplemented with inspection findings according to API, EEMUA and other appropriate standards.

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