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Visual Inspection (VT)

This method involves both direct and indirect visual inspection techniques, direct inspection is where the material is inspected directly by the human eye with no additional visual aids, indirect inspection may involve the use of magnifying glass, mirror, boroscope (mini camera), closed-circuit TV etc.

Visual inspection is a crucial NDT method which is too often overlooked, this should be the basis for inspectors starting out in the NDT industry, for example, a visual examination of an operational plant can often reveal obvious problem areas, such as leaks, excess vibration, corrosion or misalignment, this inspection is a very cost effective exercise and can be used to identify areas that require further NDT applications.

SNT-TC-1A minimum work experience and training hour’s requirements for VT examinations

Level 1

  • 8 hours (SNT-TA-1A)
  • 70 hours in method & 130 hours in NDT


We can provide Visual Testing training 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 visual inspection 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 TheorySpecific TheoryPractical Examination
  • Introduction to Visual Inspection Definitions
  • Fundamentals
  • Equipment
  • Checks and Calibrations
  • 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.
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