There are several common codes and standards that are used in the field of non-destructive testing (NDT). These codes and standards provide guidance and requirements for the performance of NDT inspections and evaluations, and they are used to ensure the quality and reliability of NDT methods and results. Some examples of common codes and standards in NDT include:

• American Society for Testing and Materials (ASTM) standards: ASTM is a global organization that develops and publishes technical standards for a wide range of industries, including NDT. ASTM standards provide guidelines for the performance of various NDT methods and techniques, as well as the interpretation and evaluation of NDT test results.
• American Society of Mechanical Engineers (ASME) codes: ASME is a professional association that develops codes and standards for the design, construction, and operation of mechanical systems and equipment. ASME codes include requirements for the use of NDT in the inspection and evaluation of pressure vessels, piping systems, and other mechanical components.
• American Welding Society (AWS) codes: AWS is a professional organization that develops standards for welding and related technologies. AWS codes include requirements for the use of NDT in the inspection of welded joints and other components.
• International Organization for Standardization (ISO) standards: ISO is an international organization that develops and publishes standards for a wide range of industries, including NDT. ISO standards provide guidelines for the performance and evaluation of NDT methods, as well as the training and certification of NDT personnel.

These are just a few examples of the codes and standards that are commonly used in NDT. There are many other codes and standards that are used in specific industries or for specific types of NDT inspections.