NDT Level III Personnel Qualification Certification for PT - Liquid Penetrant Testing Outline

About Liquid Penetrant Testing (PT)

The basic principle of liquid penetrant testing is that when a very low viscosity (highly fluid) liquid (the penetrant) is applied to the surface of a part, it will penetrate into fissures and voids open to the surface.  Once the excess penetrant is removed, the penetrant trapped in those voids will flow back out, creating an indication.

Topical Outline

This examination is 2 hours in length, having 90 questions of equal value.

  1. Principles/Theory
  2. Principles of liquid penetrant process
  3. Theory
  4. Proper selection of PT as method of choice
  5. Liquid penetrant processing
  6. Equipment/Materials
  7. Liquid penetrant test units
  8. Methods of measurement
  9. Lighting for liquid penetrant testing
  10. Materials for liquid penetrant testing
  11. Testing and maintenance of materials
  12. Interpretation/Evaluation
  13. General
  14. Factor affecting indications
  15. Indications from discontinuities
  16. Relevant and Nonrelevant indications
  17. Procedures
  18. Liquid penetrant testing procedures, codes, standards and specifications
  19. Safety and Health
  20. Toxicity
  21. Flammability
  22. Electrical hazards
  23. Personnel protective equipment
  24. Right to know (MSDS)
  25. Disposal of used materials


The number in parentheses following each reference is the ASNT catalog number.

Refresher Course

ASNT offers a PT Refresher Course based on the above topical outline.