NDT Inspection & Testing

Most countries have one or more organizations (“standards bodies”) that develop and publish technical industrial standards. Some don’t, and those usually reference existing codes and standards for their manufacturing, fabrication and construction projects. In the United States, these organizations are usually independent organizations from private industry, but in many countries they are government agencies.


The American Society for Nondestructive Testing is a member-based, non-profit professional society that provides NDT-related reference materials, technical conferences and the following certification documents. ASNT does not publish standards that describe how to perform NDT tasks; those are published by ASTM International and are discussed in that section of this web page.


ASTM International (formerly the American Society for Testing and Materials) is one of the largest voluntary standards development organizations in the world, providing technical standards for materials, products, systems, and services. Over 180 ASTM NDT standards are published in the ASTM Annual Book of Standards, Volume 03.03, Nondestructive Testing. ASTM defines three of their document categories as follows:

  • A “guide” is a compendium of information or series of options that does not recommend a specific course of action. A guide increases the awareness of information and approaches in a given subject area.
  • A “practice” is a definitive set of instructions for performing one or more specific operations or functions that does not produce a test result. Examples of practices include, but are not limited to: application, assessment, cleaning, collection, decontamination, inspection, installation, preparation, sampling, screening and training.
  • A “test method” is a definitive procedure that produces a test result. Examples of test methods include, but are not limited to: identification, measurement and evaluation of one or more qualities, characteristics or properties.

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