ASNT LT Level III – Refresher Course (Online)

The ASNT Leak Testing (LT) Level III Refresher Course by NDTWorldwide® is designed for experienced Leak Testing Level II and Level III professionals who are preparing to renew or revalidate their ASNT LT Level III certification. The course focuses on refreshing core technical knowledge and reinforcing Level III responsibilities in a clear and exam-focused manner.

This refresher program provides a structured review of key Leak Testing topics, including principles and theory of leak testing, equipment and materials, testing techniques and calibration methods, interpretation and evaluation of results, procedure requirements, and safety and health practices. Emphasis is placed on understanding leak detection methods such as bubble testing, pressure testing, halogen testing, and helium mass spectrometer testing.

The course also helps participants stay familiar with applicable leak testing standards, specifications, acceptance criteria, and exam expectations. Through focused revision and practical understanding, candidates strengthen their confidence and technical judgment, ensuring readiness for the ASNT LT Level III examination and continued performance as competent and responsible Level III professionals.

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ASNT LT Level III – Refresher Course (Online)

Training Objective

ASNT LT Level III – Refresher Course (Online)

    Principles / Theory

    • Understand the basic physical principles used in leak testing.
    • Learn how gas flow and pressure differences affect leak detection.
    • Know when and why leak testing is the correct inspection method to use.

    Equipment / Materials

    • Become familiar with leak testing standards and requirements.
    • Understand how leak detectors and instruments perform and their limitations.
    • Learn the use of vacuum pumps, bubble test equipment, pressure test systems, halogen detectors, and helium mass spectrometer equipment.
    • Understand how test data is analyzed to obtain accurate results.

    Techniques / Calibrations

    • Learn bubble testing and pressure change testing techniques.
    • Understand halogen diode leak testing methods.
    • Learn helium mass spectrometer leak testing using vacuum, static, and dynamic methods.
    • Understand calibration requirements to ensure reliable test results.

    Interpretations / Evaluations

    • Understand basic leak testing units, sensitivity, and measurement methods.
    • Learn how test materials and equipment can affect results.
    • Understand the effects of temperature and environmental conditions on testing.
    • Interpret leak signals and determine acceptance or rejection of test results.

    Procedures

    • Understand how to prepare, review, and approve leak testing procedures.
    • Ensure procedures clearly define test methods, equipment, calibration, and reporting.
    • Verify procedures meet applicable standards and specifications.

    Safety and Health

    • Understand general safety requirements for leak testing operations.
    • Recognize pressure hazards and proper pressure safety practices.
    • Learn safe handling of tracer and hazardous gases.
    • Understand the use of safety devices and monitoring equipment.

    Exam Screens

    • Understand the format and content of the ASNT LT Level III examination.
    • Prepare to answer questions related to theory, equipment, techniques, procedures, evaluation, and safety.
    • Apply Level III knowledge and judgment when reviewing exam scenarios.

Who Should Attend

This ASNT LT Level III – Refresher Course is ideal for professionals seeking certification and technical advancement:

    • Aspiring ASNT LT Level III candidates
    • NDT professionals – Managers, Engineers, Supervisors, Inspectors, Technicians
    • QA/QC & Welding professionals
    • Metallurgists, Mechanical & Production Engineers
    • Asset Integrity & RBI Inspectors
info

Note: No prerequisites to attend the course.
ASNT exam eligibility requires minimum education and experience, as per ASNT published guidelines.
A focused refresher for professionals aiming at ASNT LT Level III success.

ASNT LT Level III – Refresher Course – Syllabus

    Number of Items: 135
    Time for Completion: 4 hours

  • Physical principles in leak testing
  • Principles of gas flow
  • Proper selection of LT as method of choice
  • Leak testing standards
  • Detector and 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
  • 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
  • Basic techniques and units
  • Test materials and equipment effects
  • Effects of temperature and other atmospheric conditions
  • Calibration for testing
  • Probing and scanning or measurement and monitoring
  • Leak interpretation evaluation
  • Acceptance and rejection criteria

Procedures
Leak Testing Procedures
Leak Testing Specifications

  • Safety considerations
  • Safety precautions
  • Pressure precautions
  • Safety devices
  • Hazardous and tracer gas safety
  • Types of monitoring equipment
  • Safety

Books to be Studied (Main References)

Document Edition
1. ASNT Level III Study Guide: Leak Testing (LT)
 2nd Edition
2. Nondestructive Testing Handbook, Vol. 2: Leak Testing (LT)
 4th Edition
3. ASNT Questions & Answers Book: Bubble Leak Testing Method
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4.ASNT Questions & Answers Book: Halogen Diode Detector Testing Method
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5. ASNT Questions & Answers Book: Mass Spectrometer Testing Method
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6. ASNT Questions & Answers Book: Pressure Change Measurement Testing Method 
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7. Quick Reference Method Cards: Leak Testing (LT)
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ASNT LT Level III Refresher Course Schedule

ASNT LT Level III – Refresher Course (Online)

    • Course Dates: 2nd Feb 2026 to 28th Feb 2026 (20 Days)
    • Course Duration: 60 Hours
    • Course Mode: Online (Through Zoom)
    • Class timings: 8:30 PM to 11:30 PM IST
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