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How Radiography Makes Corrosion Inspection More Accurate Than Ever

Digital Radiography exposure with evidence of severe external corrosion.

As assets mature, it can be more efficient and cost-effective to utilize the latest methods that technology provides in helping to extend an asset's life. Rather than replacing or rebuilding infrastructure and equipment, it is feasible to detect potential risks early and get in front of any number of issues before they arise. In the field time and man hours quickly eat into overhead, so utilizing mobile equipment alongside risk detection techniques that are non-destructive and more efficient yields better long-term results, while also contributing to the bottom line.


A tool that has been refined to extremely accurate levels is Industrial Radiography. With a variety of types and uses, it is important to recognize the growth and accuracy seen in the field in recent decades. Industrial Radiography now affords the energy community the ability to see into the future in some ways, such as early detection of corrosion underneath obstructions such as insulation, but how does it work and why has it become the standard?


Industrial Radiography has become an extremely useful and efficient technique for detecting Corrosion Under Insulation (CUI) in industrial settings, including across the oil and gas industry. CUI refers to the corrosion that occurs on the external surfaces of pipes, vessels, or equipment that are covered by insulation materials. It is a frequent problem from upstream to downstream and touches all points in between.

Profile exposure for wall thickness with Digital Radiography

Radiography involves using X-rays or gamma rays to create images of the internal structures of objects. In the context of CUI, radiography can be employed to identify and evaluate the extent of corrosion that may be occurring beneath insulation, saving potential damage down the line, and providing additional safety benefits over time.


When discussing how radiography is used for detecting CUI it is important to note that various techniques exist, Conventional, Digital Radiography (DR), Real-Time Radiography (RTR), and Computed Radiography (CR), are all methods that can be employed, separate or together, to give comprehensive imaging of corrosion damage underneath insulation.


Insulation does not need to be removed to perform Conventional, DR, CR, and RTR, a radiographic source is positioned on one side of the insulation, while a film or a digital detector is placed on the other side. The radiation passes through the insulation and interacts with the underlying material, including any corrosion present. The resulting image captures the internal condition of the material.


These images are analyzed by qualified and certified Non-Destructive Technicians (NDT) who are certified in accordance with their company's Quality Written Practice which meets the requirements of the American Society for Nondestructive Testing document SNT-TC-1A, latest edition. They look for signs of corrosion, such as thinning of the metal, pitting, loss of material integrity, and blockage. Comparison with reference images or known standards helps determine the severity of corrosion and the need for further action, which can then be delivered in the form of an inspection report with recommendations and timelines for repair or replacement.


It is important to note that radiography for CUI detection may have limitations, such as the ability to detect localized or early-stage corrosion. Other non-destructive testing methods, like ultrasonic testing or thermography, can complement radiography to provide a more comprehensive assessment of CUI.


Additionally, safety is a crucial aspect when working with radiography. Proper radiation safety protocols must be followed, including the use of time-distance shielding, ALARA (As Low as Reasonably Achievable) monitoring equipment, and adherence to applicable regulations and guidelines.

Product build-up inside pipe using Digital Radiography.

While corrosion will always be an issue for any asset owner, the recent advancements in radiography help ensure that early detection and risk mitigation remain strong allies to inspectors dedicated to keeping job sites, equipment, and workers safe.


To learn more about our services, please contact the below with any questions that you may have, or to request a demo.


Joe Caldera

Director of Strategic Accounts/API 510-570-653 Inspector

P: 281.457.2225


Todd Edwards

Director Regional Accounts

P: 225.421.8640

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