Level III
LT - Leak Testing

Topical Outline

This examination is 4 hours in length, having 135 questions of equal value.

1. Principles theory
   • Physical principles in leak testing
   • Principles of gas flow
   • Proper selection of LT as method of choice
2. Equipment/Material
   • Leak testing standards
   • Detector/instrument performance factors
   • Vacuum pumps
   • Bubble testing practices and techniques
   • Absolute pressure testing equipment
   • Absolute pressure hold testing of containers
   • Absolute pressure leakage rate testing of containers
   • Analysis of data for determination of accurate results
   • Halogen testing equipment
   • Helium mass spectrometer testing equipment
3. Technique/Calibration
   • Bubble test
   • Pressure change/measurement test
   • Halogen diode detector leak test
   • Mass spectrometer leak testing
   • Helium mass spectrometer vacuum testing by dynamic method
   • Helium mass spectrometer vacuum testing by static method
4. Interpretation/Evaluation
   • Basic techniques and/or units
   • Test materials and equipment effects
   • Effects of temperature and other atmospheric conditions
   • Calibration for testing
   • Probing/scanning or measurement/monitoring
   • Leak interpretation evaluation
   • Acceptance and rejection criteria
5. Procedures
6. Leak testing procedures
7. Leak testing specifications
8. Safety and Health
   • Safety considerations
   • Safety precautions
   • Pressure precautions
   • Safety devices
   • Hazardous and tracer gas safety
   • Types of monitoring equipment
   • Safety

References

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

• NDT Handbook: Volume 1, Leak Testing (141, 141CD, 141WCD)
• ASNT Level III Study Guide — Leak Testing Method (2266)
• All Four Leak Testing Methods - Supplement to Recommended Practice No. SNT-TC-1A (Q&A Books) — Leak Testing Methods (2033A)

 

 

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