Radiographic Testing (RT)
Radiographic testing involves the use of penetrating X or gamma radiation to examine the parts and products for imperfections. An X-ray machine or radioactive isotope is used as a source of radiation. Radiation is directed through a part and onto the film. When the film is developed, a shadow graph is obtained that shows the internal soundness of the part. This Non-destructive Examination method details the minimum requirements for conducting Radiographic Examination of full penetration butt-welds in welded tanks for oil storage made of Carbon and alloy using either X-Ray or Gamma Ray as radiation source. Radiation sensitive films are used to produce image of discontinuity. Typical, types of discontinuities that can be deleted by this method are cracks, incomplete fusion, incomplete penetration, misalignment, overlap, porosity, root concavity, undercut, burn-through, excessive /inadequate reinforcement, inclusions, etc.