The Pie Gauge is a specialized tool used in Magnetic Particle Inspection (MPI) to quickly and easily verify the direction and presence of a sufficient magnetic field on the surface of a ferromagnetic test
The primary function of the Pie Gauge is to serve as an aid in determining the direction of the magnetic flux (field lines) on a surface. This is critical because MPI can only detect discontinuities (cracks, flaws) that lie roughly perpendicular (at 90 Deg.) to the magnetic field.
| Specifications | Details |
| Structure | small, circular or octagonal metal disk |
| Discontinuities | 8 triangularly shaped segments of low-carbon steel |
| The gauge is often copper-plated on the back (the side facing up during use) and may have a non-ferrous handle. | |
| Standards Compliance | ASTM E709
ASTM E1444 ASTM E3024 ASME BPVC SEC. V |
