Defect Detection (Magnetic Particle Inspection (MPI) and Die Penetrant Testing (DPT))
Dry Visual Contrast Magnetic Particle Inspection (MPI) to determine the extent of cracking at the shoulder of a fitting. Dry MPI was used to avoid potential chemical contamination of the surfaces as SCC was considered to be likely in the failure environment.
Die penetrant test (DPT) of the weld on a large pipe. The white areas are the locations where cracking of the weld HAZ occurred.
How Does It Work?
There are field kits capable of performing both MPI and DPT. Field MPI uses a U-shaped electromagnet called a “yoke” to apply a magnetic field over the area being tested while visual contrast or florescent particles are applied, usually by being allowed to drift to deposition or sprayed on. Field DPT works very similarly to lab DPT, where a die with a high wetting coefficient is applied to the material and left to sit for a certain period of time, after which a developer is added and excess die is wiped away.
Advantages
Disadvantages
When should it be used?
Other Testing Services We Offer
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KnightHawk Engineering, Inc.
400 Hobbs Rd
League City, TX 77573
(281) 282-9200 telephone
(281) 282-9333 fax
General Information: hawkwork@knighthawk.com
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Customer Support: Chris Creech
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