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Conventional Radiography
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In the industrial environment of refineries and chemical plants, inspections have to be performed on a variety of difficult to reach locations, on pipes that might be isolated and where people are working around the clock. This is where Non-Destructive Inspection methods are applied. Conventional NDT Radiography as a Non- Destructive Testing method gives a permanent record and is widely used to detect internal flaws in welds and castings, to check for mis-constructions and to detect corrosion. NDT Radiography involves the process where radioactive rays are directed at the object being inspected, pass through it and the resulting image is captured on a film. This film is in turn processed and the image displayed as a sequence of gray shades between black and white. After development of the film, thickness and density differences (i.e. material imperfections) will show as blackness differences. Acceptance criteria define whether the indication is acceptable or not. NDT Radiography encompasses sources such as X-rays, Gamma rays as well as newer methods such as real time radiography, computed radiography (CR) and computed tomography (CT). One solution can not meet all radiographic needs and the right choice depends upon the application. Exposure conditions, image quality requirements and productivity, as well as acceptability to International Codes of Practice within the industry, all have to be considered. For more information and advice on the best NDT method for your inspections, please contact the SGS NDT expert team via our Online Inquiry Form. We can help you anywhere in the world to improve the reliability of your processes and assets. |
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