The Role of Standards in Digital Radiography for Non-Destructive Testing

Digital Radiography (DR) plays a pivotal role in Non-Destructive Testing (NDT), providing an invaluable method for inspecting material integrity without causing damage. As with any precise technique, adhering to rigorous non-destructive testing standards is essential in maintaining excellence and reliability in all facets of NDT Testing.

In this article, we’re exploring the value of digital radiography as an NDT method, and the role that standards play in maximizing that value. We’ll also consider some of the most important international standards governing digital radiography.

The Benefits of Digital Radiography in NDT

DR is an indispensable tool for NDT professionals. It is often used alongside other NDT techniques such as eddy current testing, acoustic emission testing and liquid penetrant testing. It also offers significant advantages over conventional radiography, such as reduced radiation exposure and greater portability of the systems themselves.

Here are some of the most important benefits that DR brings to NDT processes.

Faster, Better Diagnostic Imaging

DR delivers high quality digital imaging, enabling professionals to detect flaws with greater speed and precision. And because it’s virtually instant, DR also accelerates the inspection process, providing rapid, accurate analysis for informed decision-making.

Cost Efficiency

These systems require substantial initial investment, but their operation is cost-efficient over time. The elimination of film and chemical expenses, coupled with reduced labor costs due to faster processes, results in long-term savings for organizations.

Technology Integration

DR systems integrate with various inspection and data management technologies, streamlining NDT activities. This integration fosters consistent, repeatable imaging performance, guaranteeing reliable and replicable inspection results.

Reduction of LOPC Events

Researchers have pointed out that DR reduces Loss of Primary Containment (LOPC) events, in which hazardous substances are released in an uncontrolled or unplanned way. Minimizing the frequency and impact of LOPC events is a critical safety priority in many industries.

The Role of Standards

In order to maximize these benefits, it’s necessary to adhere to established standards. These standards are not merely guidelines. They are designed to guarantee quality and reliability in all NDT Testing procedures, based on the collective experience and insights of professionals and regulatory bodies.

They’re also essential to international cooperation and trade, because they establish a common language and understanding that professionals can rely on around the world.

Key Standards in Digital Radiography for NDT

These 4 standards, issued by ASTM International and ISO, play a crucial role in guiding the practices of radiographic testing and inspection within various industries. They provide benchmarks for evaluating the performance, reliability, and quality assurance of Digital Detector Arrays (DDAs), Computed Radiography (CR) systems, and the radiographic examination of welds and castings.

1. ASTM E2737

Title: Standard Practice for Digital Detector Array Performance Evaluation and Long-Term Stability.

Overview: This standard guides the assessment of digital detector arrays (DDAs) used in radiographic testing. It provides protocols for evaluating performance metrics such as basic spatial resolution, image lag, and dynamic range. The standard also advises on procedures for long-term stability monitoring of DDAs to ensure consistent performance over time. DDAs are crucial for capturing radiographic images used in non-destructive testing.

2. ISO 17636-2

Title: Radiographic Testing – Part 2: X- and Gamma-Ray Techniques with Digital Detectors.

Overview: Part of a broader series on radiographic testing, ISO 17636-2 focuses on the techniques used when employing digital detectors in radiographic testing of fusion-welded joints. This standard outlines requirements and guidelines for performing, evaluating, and documenting these inspections to assure weld quality and integrity.

3. BS EN 12681-2:2017

Title: Founding – Radiographic testing: Part 2: Techniques with digital detectors

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Overview: BS EN 12681-2:2017 establishes general principles for the radiographic examination of metallic castings using digital radiography systems. The standard is crucial for industries reliant on casting processes, providing a framework to inspect, analyze, and document the internal soundness of cast products without destructive testing.

4. ASTM E2597

Title: Standard Practice for Manufacturing Characterization of Digital Detector Arrays.

Overview: ASTM E2597 describes procedures for evaluating and characterizing the performance of Digital Detector Arrays (DDAs) at the time of manufacturing. It is meant to ensure that DDAs meet quality and performance standards upon production, providing a benchmark for future performance evaluations and long-term stability assessments.

The Benefits of Adhering to Standards

Adherence to these standards ensures the safety and quality of the materials tested in NDT processes. It also elevates the reputation of testing organizations, demonstrating compliance and fostering confidence among stakeholders and partners in the industry.

Nevertheless, implementing DR comes with certain challenges of its own.

Substantial Initial Investment

Purchasing advanced DR equipment, software, and technology requires a significant upfront cost, potentially daunting for small to medium-sized enterprises.

Need for Specialized Training

Operators must receive specialized training to proficiently use DR systems, interpret results accurately, and understand compliance requirements.

Integration Challenges:

Integrating DR technology with existing systems and workflows is intricate, often requiring additional investment in complementary technologies and systems.

Smart, Portable DR Solutions by Vidisco

Vidisco’s portable digital X-ray systems enable companies to leverage the benefits of digital radiography while adhering to international standards.

Our systems are designed for simple operation, allowing inspectors to work efficiently and confidently without the need for extensive training. With minimal ramp-up costs and a quick realization of value, Vidisco systems deliver a high return on investment. Vidisco presents a comprehensive solution, ensuring businesses can confidently harness the power of DR for their NDT needs.