This involves applying a liquid dye to the surface of a material and leaving the dye to “dwell” on the surface for a predetermined period of time. The liquid can be either a colour that is easily visible under normal lighting conditions or a yellow/green fluorescent colour that requires special lighting conditions to be seen effectively. This liquid dye enters into discontinuities that are open to the surface of the material through a phenomenon called “capillary action”. This capillary action takes place throughout the dwell time and the discontinuity retains this dye when the excess dye is cleaned from the surface. A type of developer is then applied to the surface of the material and the dye that is trapped inside the surface discontinuities is blotted back out on to the surface and forms an indication. This indication is then interpreted by a qualified interpreter. The PT method is suitable on most non absorbent materials.

Liquid Penetrant Testing - Level III

    • PCN requirements for Level 3 approval
    • Complementary NDT methods
    • Quality assurance, quality control and supervision
    • Specifications/procedures and techniques
    • Analysis of PT reports
    • Advanced penetrant theory and revision
    • Analysis of procedures
    • Procedure writing
    • Mock examinations

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