MPI can be conducted on painted surfaces if the paint thickness is within acceptable limits, typically less than 0.05 mm
(1 to 2 mils) for non-fluorescent particles and up to 0.1 mm for fluorescent particles. Thicker coatings may reduce the
sensitivity of the inspection by weakening the magnetic field or obscuring indications.
The ability to detect subsurface defects may be compromised if the paint is too thick or if the magnetic field strength is
insufficient. Adjust the magnetising current and equipment (e.g., yokes, prods, or coils) to account for the coating.
Consider removing the paint in the inspection area. Alternatively, use other non-destructive testing methods like ultrasonic
testing (UT) for thicker coatings. Always validate the MPI procedure on a painted test piece with known defects to confirm
sensitivity.
C Sridhar.
--Dear allCan I do MPI above painting surface for cs tank
Sriram Srinivasan
https://materials-welding.blogspot.com/
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