Digital Detector Array Radiographic Testing – DDA RT

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  9. Digital Detector Array Radiographic Testing – DDA RT

IRISNDT applies DDA RT to obtain clear images of the cross-sections of components (many while in operation, and with insulation). Unlike Computed Radiography (CR), with DDA one can see an image immediately without processing through a computer. Different than traditional RT with film, an image develops without processing (and immediately). The digital image serves as a chronological record of the condition of the component; it can be stored, accessed, and compared as easily as any other digital data.

IRISNDT APPLIES DDA RT FOR:

  • Monitoring pitting and overall losses of piping through profile images (shadow shots)
  • Examining insulated and non-insulated piping components
  • Examining for corrosion under insulation
  • Monitoring the erosion/corrosion losses of components within insulated piping
  • Allowing personnel from multiple remote locations to view the data on FTP sites
  • Monitoring the operating (open/close) condition of valves
  • Examining rubber components for fabrication flaws
  • Assessing geophysical core samples

ADVANTAGES​

  • Saves time and improves productivity over conventional film applications. The exposure time is usually much shorter than that needed for film
  • Views multiple components (valves, pipe, fittings and threaded parts) all in the same image
  • Reduces the number of shots (and radiation time) needed to assess piping conditions
  • Can adjust brightness and contrast
  • Can magnify and process images
  • Can measure dimensions and calculate remaining thickness values
  • Can improve image evaluation
  • Operates on 120 volt or on battery power
  • Works with Ir-192, Co-60, and X-Ray sources

LIMITATIONS​

  • Radiation safety considerations are the same for DDA RT as standard radiography
  • Physical space and on-site electrical power are required to set up the equipment
  • Requires access to both sides of the part

Safety is a fundamental consideration when using radiation. Clearance of large areas adjacent to the component from persons or items that may be affected by radiation is required. A significant radiation dose can cause physical changes in the human body. Strict regulations, coupled with highly trained and qualified personnel, ensure the safety of everyone.

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Learn more about how IRISNDT applies DDA