Magnetic Particle
Testing

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What is Magnetic Particle Testing?

Magnetic Particle Inspection (MPI) is a method of quickly detecting cracks and other flaws on or near the surface of ferromagnetic materials. It is a fast, reliable, and relatively inexpensive NDT technique that provides immediate results.

How It Works

The component to be inspected is magnetised using a suitable magnetisation technique. Iron particles, either dry or suspended in liquid, are applied to the surface. Where there is a flaw, the magnetic field leaks out of the surface and attracts the particles, forming a visible indication of the defect.

Applications

• Structural steel sections and frames
• Weld inspection and post-weld quality assurance
• Castings — detecting shrinkage cracks and cold shuts
• Forgings — surface and subsurface flaw detection
• Pipelines and pressure vessels
• Drill pipe and downhole equipment
• Axles, shafts, and rotating components

Key Advantages

• Rapid inspection speed — ideal for high-volume inspection
• Detects both surface and slightly subsurface defects
• Immediate, visible indications on the component
• Applicable to complex shapes and rough surfaces
• Often used in conjunction with other NDT techniques for comprehensive assessment
• Conforms to international standards including ASME, ISO, ASTM, and EN codes

Standards & Certifications

All MEM NDT Services inspections are conducted in accordance with applicable international standards. Our personnel are qualified and certified to perform MT inspections on critical components in oil & gas, power generation, petrochemical, mining, and general engineering applications.