Magnetic Flux Leakage Testing (MFL) Services
Magnetic Flux Leakage uses strong magnets to detect wall loss and corrosion in pipelines and storage tank floors.
What is Magnetic Flux Leakage Testing?
Magnetic Flux Leakage (MFL) is a widely-used NDT method for inspecting ferromagnetic materials, particularly in pipeline and storage tank applications. A strong magnetic field is applied to the material, and sensors detect flux leakage caused by wall thickness reductions, corrosion, or other defects. MFL is commonly used in pipeline pigging operations for inline inspection.
How MFL Works
Strong magnetic field saturates the test material
Wall loss causes magnetic flux to leak from surface
Hall effect sensors or coils detect flux leakage
Signal analysis determines defect severity
Applications of Magnetic Flux Leakage Testing
Advantages
- Fast scanning speed
- No couplant required
- Can inspect through coatings
- Automated inspection possible
- Good for large-area scanning
- Established pipeline inspection method
Limitations
- Only works on ferromagnetic materials
- Sensitivity affected by scanning speed
- Difficult with thick materials
- Cannot determine exact defect depth
- Strong magnets create handling challenges
Applicable Standards & Codes
Industries Using MFL
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Other NDT Methods
Ultrasonic Testing uses high-frequency sound waves to detect internal flaws, measure material thickness, and characterize material properties.
Learn moreRadiographic Testing uses X-rays or gamma rays to create images of a component's internal structure, revealing hidden defects.
Learn moreMagnetic Particle Testing detects surface and near-surface defects in ferromagnetic materials using magnetic fields and iron particles.
Learn moreLiquid Penetrant Testing reveals surface-breaking defects by applying a colored or fluorescent dye that seeps into cracks and discontinuities.
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