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7/22/2019 RT & AUT
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COMPARING
RADIOGRAPHY WITH
AUT
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7/22/2019 RT & AUT
2/11
AUT Technology has now largely replaced
radiographic inspection techniques for the
examination of pipeline welds and has
become the NDT industry-standard
examination method for pipeline weld testing
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7/22/2019 RT & AUT
3/11
PRINCIPLES OF RADIOGRAPHY AND AUT
Radiation works on the principle of differential
absorption.
AUT works on the principle of acoustic impedance
mismatch
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RADIOGRAPHY VS. AUT
Radiography 2D Grayscale View
High Acceptability
Good for volumetric detection.
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7/22/2019 RT & AUT
5/11
LIMITATIONS OF RADIOGRAPHY
Radiation Hazard
Requires Multiple Trained Technicians
High Consumable Cost and Waste
Poor Data Archiving and Handling
Lack of Data Integrity Protection
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7/22/2019 RT & AUT
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Long Cycle Time Delay (8-24 welds)
Large and Complex Hardware
Mobile and stationary facility needed for darkroom /
viewing facility
Radiography has limitations in the detection of
planar flaws whereas AUT is ideally suited
LIMITATIONS OF RADIOGRAPHY
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7/22/2019 RT & AUT
7/11
STATE OF AUT
Technology is now mature
Technology is now accepted at all levels
Technology manageable using Phased Array
UT
Productivity exceeds welder
No Environmental hazard
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7/22/2019 RT & AUT
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RADIOGRAPHY Vs. AUT
Near Real-Time Process Control of Welder
Excellent POD
Vertical Defect Sizing
Lower Reject Rates Using ECA
Multiple Views of Weld Zones
No Radiation Hazard
AUT
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Low or No Consumable Costs
All Digital Data Archiving
Real Time Inspection Results
GPS Data Tagging
Higher Productivity
Overall cost savings for client
RADIOGRAPHY Vs. AUT
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7/22/2019 RT & AUT
10/11
AUT can: The inspection speed is approximately 3 minutes,
weld
to weld.
Feedback provided closer to real time. Vertical/through wall
defects are better identified and
quantified.
Lower Reject Rates Using ECA.
The multi-angle weld bevel prevented
detection by RT for two zones. 45
5
37.5
RADIOGRAPHY Vs. AUT
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7/22/2019 RT & AUT
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COST SAVINGS FROM AUT
Companies using pipeline AUT are realizing
considerable savings over RT as the repair rates
are considerably less.
Get better inspection with excellent POD andVertical Defect
Sizing.
Production rates are higher.
Overall cost savings for client.
