Liquid Penetrant Testing

This course prepares students for our certification examinations and provides them with the history, theory, and practical knowledge to become a Liquid Penetrant Testing Inspector. This course will ultimately prepare the inspector to perform Level I and Level II Liquid Penetrant testing responsibilities. Topics covered include both level I and Level II sections: Essential and ethical duties of the Liquid Penetrant Testing Inspector, history and present state of Liquid Penetrant Testing, Principles of Penetrant Testing, Penetrant Materials, Methods and Techniques, Quality and Process Control, and Penetrant characteristics. Additional topics that will be covered in Levell II only include defect-ology, Codes (specifications, standards, and procedures) as they apply to Liquid Penetrant Testing, and interpretation of results.


Course Objectives

The objective of this course is to give a foundation in the history of Liquid Penetrant testing, steps for performing liquid penetrant. To give a understanding of the characteristics of penetrants, emulsifiers, and their developers.  To be able demonstrate penetrant testing methods and techniques. Finally, the nature of defects and inspection of welded joints will be learned and demonstrated.

• To become familiar with Penetrant testing materials and their properties.

• To analyze and understand specific gravity and viscosity.

• To understand technique selection and penetrant removal.

• To learn the difference in penetrants, emulsifiers, and developers and their uses.

• To become familiar with different Liquid Penetrant testing practices.

• To determine visible and fluorescent indications.


Course Structure

This course is designed to provide a hybrid experience, including classroom and hands-on training. This class will be divided in the following way:

80% Classroom Training

Theory of Liquid Penetrant Testing

Familiarity with penetrant principles and materials

Code and procedure clinics

20% Field Hands-On Training

Familiarity with testing pipes and plates

Familiarity with different penetrant processes

Field training based on job site location at time of class


Course Outline



• Improving Detection

• History of Liquid Penetrant Testing


• Steps of Liquid Penetrant

• Common Uses for Liquid Penetrant

• Characteristics for Liquid Penetrant

Penetrant Testing Materials

• Penetrants

• Emulsifiers

• Developers

Methods and Techniques

• Preparation

• Technique Selection

• Removal

• Selection of Developer

Quality and Process Control

• Part/Penetrant Temp

• Dwell

• Wash and Drying

• Lighting

• Developer

Penetrant Characteristics

• Defect Nature

• Health and Safety

Essential and Ethical Duties of the Inspector

• Duties and Responsibilities

• Notification of Discrepancies

• Inspection Reports


Textbook and Course Material

• Liquid Penetrant Testing Classroom Training Book (ASNT)

• American Petroleum Institute (API) 1104 Piping Welding Code

• American Welding Society (AWS) D1.1 Structural Steel Welding Code


 Our philosophy at NDE Institute is based on our belief that the strongest inspectors are those who are trained with a focus on ethics and essential responsibilities.

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