Oilfield Glossary

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Note: Definitions provided on this website are for reference purposes only. Engineers and professionals should independently confirm all information using industry standards.

Magnetic particle inspection

Magnetic Particle Inspection (MPI) is an NDT method used to detect surface and near-surface discontinuities in ferromagnetic materials (steel). A magnetic field is induced in the part, and iron particles (dry or wet suspension) are applied.

If there is a crack, the magnetic flux leaks out and attracts the particles, creating a visible indication of the flaw. It is widely used to inspect BHA connections, lifting lugs, and welds.

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