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Riser Bolt
Inspection
Application Solution
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Overview
• Inspection Challenge
• Recommended Phased Array Ultrasonic (PA UT)
Solution
• Results
• Benefits of Zetec Solution
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• Riser bolts require regular in-service
inspections for crack detection
• Removing bolts is time consuming, so
owners look for reliably “in-situ” inspection
• Manual inspection techniques (conventional
Ultrasound (UT) or PA UT are not sufficiently
effective :
‒ Signal interpretation can prove difficult in the
presence of multiple geometrical echoes (e.g.
threads) and reflections
‒ No permanent data recording or position
information
Inspection Challenge
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Recommended PA UT Solution
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• Encoded phased array UT will improve efficiency and reliability of the inspection :
– Increased detection capability
– Improved characterization and sizing of indications, through adequate visualization of inspection data
– Provides permanent records
• Solution dealing with variety of bolt types :
– Simple, encoded manually driven scanning tool
– Standard phased array UT probe driven by a portable phased array unit
– On-board software tools allowing for efficient and reliable interpretation of inspection data
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Inspection Technique
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• 1D linear array, 5 MHz, 32 elements
• Azimuthal scan, generating LW beams, focused
at the bolt OD surface (“projection” mode)
• Selection of refracted angles through ray-tracing
for adequate coverage of the area of interest
• Guided and encoded rotation of the probe to
cover the complete circumference of the bolt
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• Encoded rotation, manually driven
• Adjustable radial probe position
• Spring-loaded probe for adequatecoupling
• Fits onto a range of hex nuts
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Dedicated Manual Scanner
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• Fully integrated, portable PA UT unit
• PA UT 32/128PR + 2 UT at 200 V
• 64-bit computer, fast processing
• Rugged, battery operated
• Driven by UltraVision Touch
software for setup, recording
and full data analysis
• 2GByte data files on-board
• Reporting Feature
Zetec Instrument
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Results on Test Bolt
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Scan (deg)Depth (inch)
Notch 1
0.75ʺ x 0.25ʺ (L x d)
Notch 2
0.75ʺ x 0.125ʺ
Notch 3
0.75ʺ x 0.375ʺ
Notch 4
0.75ʺ x 0.325ʺ
Notch 5
0.75ʺ x 0.25ʺ
Notch 6
0.75ʺ x 0.125ʺ
Notch 7
0.5ʺ x 0.06ʺ
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Results on Test Bolt
Notches 1 and 2, close to the echo from the bolt geometry, are well resolved by usingthe Linked B-Scan View; detection from A-scan only is challenging
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Results on Test Bolt
Notches 3, 4, 5 and 6, all in the threaded area, and with depths varying from 0.125” to 0.375”, are clearly detected and resolved from the thread signals
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Results on Test Bolt
Notch 7, only 0.06” deep, and located in close proximity of the back wall, can be clearly resolved from the geometry
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Results on Test Bolt
3D imaging of phased array UT data in riser bolt CAD model, generated with UltraVision Classic 3D software, facilitates data interpretation by end users
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• Encoded manual scanning device provides repeatable
results and permanent recording
• , a fully integrated portable system:– High performance from on-board 64-bit computer
– On-board UltraVision Touch software provides all required tools from
setup through reporting
– Capability to record large data files (up to 2 GBytes)
• Easy to deploy:– Dynamic Merge views for on-line monitoring of inspection data
– Complete data analysis capability
– Indication Table & Report Generation
• Files fully compatible with UltraVision Classic 3D software
Benefits of Zetec Solution
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Thank You!
Learn more at: www.zetec.com
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