Basic Topical Outline


Leak Testing is used to detect through leaks using one of the four major LT techniques: Bubble, Pressure Change, Halogen Diode and Mass Spectrometer Testing.

  • Bubble Leak Testing relies on the visual detection of a gas (usually air) leaking from a pressurized system; Pressure Change Leak Testing can be performed on closed systems only-- detection of a leak is done by either pressurizing the system or pulling a vacuum then monitoring the pressure.
  • Halogen Diode Leak Testing is done by pressurizing a system with a mixture of air and a halogen-based tracer gas-- after a set period of time, a halogen diode detection unit, or "sniffer", is used to locate leaks.
  • Mass Spectrometer Leak Testing can be done by pressurizing the test part with helium or a helium/air mixture within a test chamber then surveying the surfaces using a sniffer, which sends an air sample back to the spectrometer.

Topical Outline

1. Principles/Theory

    • Physical principles in leak testing
    • Principles of gas flow
    • Proper selection of LT as method of choice

2. Equipment Materials

    • 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. Techniques/Calibrations

    • 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

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