Digital / Computed Radiography
Digital / Computed Radiography (DR / CR)
Digital and Computed Radiography (DR / CR) are advanced radiographic testing methods that replace traditional film with digital imaging systems, enabling faster inspections, improved image quality, and reduced radiation exposure. At Assessfie, our DR and CR services deliver high-resolution images for accurate detection of internal defects such as cracks, porosity, inclusions, lack of fusion, and corrosion—without damaging critical components. These techniques are ideal for projects requiring speed, safety, and digital traceability.
How Digital / Computed Radiography Works
- A radiation source (X-ray or gamma ray) is positioned to penetrate the test object.
- In Computed Radiography (CR), a phosphor imaging plate captures the radiation image and is scanned digitally.
- In Digital Radiography (DR), a digital detector array (DDA) captures the image instantly.
- The digital image is enhanced, analyzed, and interpreted by certified radiographers to identify defects and generate a detailed inspection report.
Technologies & Techniques We Use
- Computed Radiography (CR) with Phosphor Imaging Plates
- Digital Radiography (DR) with Flat Panel Detectors (DDA)
- Portable X-ray and Gamma Ray Sources
- Real-Time Image Processing and Enhancement
- Digital Image Storage, Archiving, and Traceability
- Field-ready DR/CR systems for site and offshore inspections
Digital / Computed Radiography Applications in the Oil & Gas Industry
DR and CR are widely used across upstream, midstream, and downstream sectors where rapid inspection and high-quality imaging are essential. Common applications include:
- Pipeline Weld Inspection — Girth welds, tie-ins, and repair welds
- Pressure Vessels & Storage Tanks — Shell welds, nozzle attachments, and critical joints
- Heat Exchangers & Boilers — Tube-to-tubesheet welds and channel welds
- Valves, Flanges & Piping Fittings — Internal weld defect detection
- Offshore & Marine Structures — Structural welds and piping assemblies
- Fabrication Quality Control — Shop-level inspection of skids, manifolds, and modules
- Corrosion & Erosion Assessment — Detection of internal wall thinning
- Weld Repair Verification — Confirmation of defect removal and weld quality
Advantages of Digital & Computed Radiography
- Reduced radiation exposure compared to conventional film radiography
- Immediate image availability and faster inspection turnaround
- Enhanced image quality and defect detectability
- Digital storage, sharing, and long-term traceability
- Improved safety in controlled and close-proximity environments
Standards & Regulations
Our Digital and Computed Radiography services strictly follow international standards and industry codes to ensure safety, accuracy, and global acceptance.
International Standards
- ISO 17636-1 — Radiographic testing of welds using film and imaging plates (CR)
- ISO 17636-2 — Radiographic testing of welds using digital detectors (DR)
- ISO 5579 — Radiographic examination of metallic materials
- ISO 11699-1 & 11699-2 — Classification of industrial radiographic film and processing control
ASTM Standards
- ASTM E94 — Standard guide for radiographic examination
- ASTM E1815 — Classification of digital detector arrays
- ASTM E2698 — Digital radiographic examination of welds
- ASTM E2033 — Computed radiography imaging plates
Industry-Specific Standards
- API 1104 — Radiographic inspection of pipeline welds
- API 650 — Radiographic inspection of storage tanks
- API 570 — In-service piping inspection
- ASME Section V — NDT requirements for pressure equipment
Personnel Qualification Standard
- SNT-TC-1A — Qualification and certification of NDT personnel
