Radiographic Testing (RT)

Acuren Radiographic Testing (RT)

Acuren provides a variety of radiography services for an array of applications and industries.

Gamma (Iridium, Selenium and Cobalt sources) and X-ray inspection methods are used for profile radiography, field and piping welds, investment castings and heavy wall vessel inspection.

Computed and Digital Radiography services that permit lower source strengths and smaller radiation exclusion zones are also available.

SubjectDetails
PrinciplesA radiograph is a photographic image produced by the passage of radiation through an object onto film. Variations in the amount or intensity of radiation are used to determine thickness or composition of material, as well as to detect flaws such as slag, porosity, cracks and inclusions. Radiographic inspection uses X-Ray radiation generated by an X-Ray tube or Gamma radiation generated from iridium, selenium or cobalt sources. Central to radiography work is getting quality images that meet applicable code requirements, careful interpretation of the images to identify areas of interest and reporting on the results in a manner that is actionable by our client.
How and where is it used?Volumetric inspection of wide range of materials with varying densities for internal defects Weld examination Profile imaging Fabrication and repair of tanks, vessels and piping Field and piping welds Investment castings Heavy wall vessel inspection Cast parts slag, porosity, cracks and inclusions Crack detection, water entrapment, foreign object damage detection in aviation industry.
Applicable Codes/StandardsASNT-SNTC-1A
CP 189
ASME Section IV
API 1104
ASTM E 94, Standard Guide for Radiographic Examination
ASTM E 155, Standard Reference Radiographs for Inspection of Aluminum and Magnesium Castings
ASTM E 592, Standard Guide to Obtainable ASTM Equivalent Penetrameter Sensitivity for Radiography of Steel Plates 1/4 to 2 in. [6 to 51 mm] Thick with X Rays and 1 to 6 in. [25 to 152 mm] Thick with Cobalt-60
ASTM E 747, Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image Quality Indicators (IQI) Used for Radiology
ASTM E 801, Standard Practice for Controlling Quality of Radiological Examination of Electronic Devices
ASTM E 1030, Standard Test Method for Radiographic Examination of Metallic Castings
ASTM E 1032, Standard Test Method for Radiographic Examination of Weldments
ASTM 1161, Standard Practice for Radiologic Examination of Semiconductors and Electronic Components
ASTM E 1648, Standard Reference Radiographs for Examination of Aluminum Fusion Welds
ASTM E 1735, Standard Test Method for Determining Relative Image Quality of Industrial Radiographic Film Exposed to X-Radiation from 4 to 25 MeV
ASTM E 1815, Standard Test Method for Classification of Film Systems for Industrial Radiography
ASTM E 1817, Standard Practice for Controlling Quality of Radiological Examination by Using Representative Quality Indicators (RQIs)
ASTM E 2104, Standard Practice for Radiographic Examination of Advanced Aero and Turbine Materials and Components
Form of report or deliverable?Radiograph film image and interpretation notes.
AdvantagesPermanent record of test in the form of easily interpretable radiograph Highly sensitive Versatile in examining a variety of shapes and sizes Volumetric inspection that eliminates need to disassemble component High sensitivity.
LimitationsRT has thickness limitations based on material density and energy used Can be time consuming Radiation hazard Cracks oriented perpendicular to the x-ray beam may not be detected Electrical source required for X-ray tube inspection .
AlternativesComputed Radiography (CR), Digital Radiography (DR)

High sensitivity of the CR and DR exposure plates permits use of less radiation, higher sensitivity, faster production and smaller radiation safety zones that allow work in surrounding areas to continue during inspection.

Ultrasonics (UT) , Phased Array Ultrasonics (PA)
UT results are immediate (no processing time), no radiation hazard.
Certifications of technicians performing the work?Level II Radiographer is required to have 80 hours instruction and 1,600 hours experience in method Refresher training available on Hellier website (www.hellierndt.com)
Rope access applicable?Yes