Radiography is a type of nondestructive examination technique that uses radiation (either x-rays or gamma rays) to inspect various types of equipment. It sees extensive use in industrial facilities. Radiography works by using a device to emit radiation at a piece of equipment. Some of the radiation passes through the equipment and is captured on the other side. This creates an image that can show signs of possible flaws or damage in the equipment.

There are two main kinds of radiography: conventional radiography and digital radiography.

Conventional Radiography

Conventional radiography inspection works by using a special film that reacts to the radiation passing through the equipment, creating the picture to be examined. Because the radiation is captured on film as a part of the process, conventional radiography always provides a permanent, physical record of the test results.

Digital Radiography

Digital radiography uses a phosphor screen or flat panel containing micro-electronic sensors to capture the radiation rather than a film. The resulting image is stored digitally, instead of on film. Digital radiographs tend to be easier to store and show less image degradation.

Radiography Applications

Radiography has a number of applications within the O&G and petrochemical industries. It is often used to inspect heavy walled vessels, but can also be an effective tool for examining other types of equipment, such as castings and valves.

When pipelines are under construction, radiography is the technique most often used to determine the quality of the welds. It is also effective for determining weld quality in other equipment such as flow lines, meter stations, and compressor facilities.

Advantages of Radiography

Both forms of radiography have a number of advantages when compared to other forms of NDE. They have a high level of repeatability and can provide accurate and consistent readings. They can be used on a variety of materials, not just ferromagnetic materials.

Furthermore, very little surface preparation is required beforehand. This makes this method relatively simple to perform. Also, radiography equipment tends to be light and portable, and thus can be used to perform inspections in places that might otherwise be difficult to access.

Finally, because both types of radiography produce images, the results of inspections can be compared to historical test results to track the growth of damage over time.

Sentinel’s Radiography Expertise

Sentinel Integrity Solutions offers both conventional and digital radiography inspections as a part of our comprehensive on-stream and turnaround inspection services. Click the button below to contact our experts. We will work with you to determine whether or not conventional or digital radiography is the right application to fit your needs.

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