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RADIOGRAPHIC TESTING (RT)

Radiographic Testing (RT) is a volumetric method that uses ionizing radiation to form images that can be used to determine quality, assess damage or simply gather information. Conventional RT using film continues to be a mainstay in the construction of pipelines, vessels, tanks and facilities.

Radiographic Testing (RT) has long been the go-to method for determining the acceptability of welds in pipelines, pressure vessels, tanks and castings. RT is typically performed using either X-Ray or Gamma ray as the source of penetrating radiation. Both sources produce electromagnetic radiation, with energy and intensity being a variable.  Material type, thickness, and shooting technique are factors in determining the type of source to be used.

 

Applications for Radiography:

  • Examination of welds, castings, forgings, and composites

  • Corrosion detection and the measurement of wall thickness (profile radiography)

Advantages of Radiography:

  • Utilized for examination of a wide variety of material types 

  • Is sensitive to evident changes in thickness caused by corrosion/erosion, voids in material, certain weld flaws and to material density changes

  • Detects both surface and subsurface defects

  • Creates permanent record of the inspection

Limitations of Radiography:

  • Safety precautions are required for the safe use of radiation

  • Access to both sides of the specimen is required

  • Orientation of the test piece and certain flaws is critical

  • Requires several steps to produce final, interpretable radiograph

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