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Liquid Penetrant Inspection (Pt)

This involves applying a liquid dye to the surface of a material and leaving the dye to “dwell” on the surface for a predetermined period of time. The liquid can be either a color that is easily visible under normal lighting conditions or a yellow/green fluorescent colour that requires special lighting conditions to be seen effectively.

This liquid dye enters into discontinuities that are open to the surface of the material through a phenomenon called “capillary action”. This capillary action takes place throughout the dwell time and the discontinuity retains this dye when the excess dye is cleaned from the surface. A type of developer is then.

This involves applying a liquid dye to the surface of a material and leaving the dye to “dwell” on the surface for a predetermined period of time. The liquid can be either a color that is easily visible under normal lighting conditions or a yellow/green fluorescent color that requires special lighting conditions to be seen effectively. This liquid dye enters into discontinuities that are open to the surface of the material through a phenomenon called “capillary action”. This capillary action takes place throughout the dwell time and the discontinuity retains this dye when the excess dye is cleaned from the surface. A type of developer is then.

The PT method is suitable on most non absorbent materials.

We can provide Liquid Penetrant Inspection courses and examinations suitable for any of the following certification scheme.

• SNT-TC-1A in accordance with your/our company written practice

We can also provide :

• Preparation training for ASNT Level 3

An example of the syllabus that is used for Liquid Penetrant training courses is shown below for Level 1. DECIBEL can tailor make the syllabus to satisfy the requirements of an individual’s company specific written practice if requested.

Level 1
General Theory	Specific Theory	Practical Examination
Basic Principles of Liquid Penetrant Inspection Safety Precautions Surface Preparation of Materials for Inspection Materials and Equipment used Assessment and Implementation of Control Tests Suitable Testing Technique Post Test Procedures	Application of the Method and use of Codes, Specifications and Procedures, applicable to the company, including the relevant control checks.	Follow written instructions and process the inspection test pieces, record and report defects from know datum markers, carry out pre-test calibration checks, post-test procedures.