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Magnetic Particle

​​What is Magnetic Particle Inspection?

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​Magnetic Particle Inspection (MPI) is a widely used non-destructive testing technique for detecting surface and near-surface flaws in ferromagnetic materials. It plays a crucial role in ensuring the safety and reliability of components across various industries.

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How does MPI work?

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The MPI process involves the following key steps:​

  1. Preparation: The surface of the test object is cleaned to remove any dirt or grease, that could hide defects.​

  2. Magnetisation: The test object is then magnetised, creating a magnetic field. This can be done using a magnetic yoke or an electromagnetic device.

  3. Application of Particles: A fine magnetic powder, usually in a liquid suspension, is applied to the surface. These particles are attracted to the areas where the magnetic field is disrupted by defects, like cracks or inclusions.

  4. ​Inspection and Evaluation: The inspector examines the surface under white light or ultraviolet light (if fluorescent particles are used).

MPI to structural steelwork
A crack detected using MPI

Advantages of using MPI

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  • Fast and Reliable: MPI provides quick results, allowing for timely decision-making in production and maintenance.

  • Cost-Effective: As a non-destructive technique, MPI helps avoid costly repairs or replacements by identifying issues early.​

  • Versatile: MPI can be applied to a variety of components, including welds, castings and forged parts, making it a flexible option for many industries.​

  • Minimal preparation: MPI requires less surface preparation compared to other NDT methods.

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Applications of MPI

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Magnetic Particle Inspection is widely utilised in numerous industries, including, but not limited to:

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  • Aerospace: To test aircraft welds, landing gear and blades

  • Oil & Gas: To test tanks, pipelines and support structures

  • Petrochemical: To test pressure vessels, heat exchangers & piping systems

  • Mining: To test drilling equipment, cranes & lifting equipment 

  • Fabrication: To test structural welds, pressure vessels and pipework

  • Marine: To test hull structures, piping systems and deck equipment

  • Power Generation: To test turbine components, boiler components and piping systems

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Magnetic Particle Inspection
Fluorescent MPI Test

​Comprehensive Reporting

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With each MPI job, we provide comprehensive written reports, detailing our findings. These reports include an overview of the inspection process, the results, and any identified defects, ensuring that have a clear understanding of the components condition and any recommended actions.

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Our Skilled Team

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At Testa, our experienced and skilled staff are dedicated to delivering top-quality Magnetic Particle Inspection services. With extensive training and expertise in NDT techniques, our team ensures that every inspection is thorough, accurate and conducted with the highest standards of safety and reliability. All our staff are qualified to industry recognised PCN (personnel certification in non-destructive testing) in accordance with BS EN ISO 9712.

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