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Solution: Riser Bolt Inspection


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Risers are critical components in the upstream segment of the oil & gas industry. Riser bolts require regular inspections for crack detection. Removing bolts is time consuming and many manual inspection techniques are ineffective.

This presentation provides a recommended solution that can improve the efficiency and reliability of the inspection with an increased detection capability, permanent records and more.

Published in: Engineering
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Solution: Riser Bolt Inspection

  1. 1. © Zetec Inc. All rights reserved Riser Bolt Inspection Application Solution August 2018
  2. 2. © Zetec Inc. All rights reserved • Inspection Challenge • Recommended PA UT Solution • Results • Benefits of Zetec Solution Overview 2
  3. 3. © Zetec Inc. All rights reserved • 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 (conv. 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 Challenges 3
  4. 4. © Zetec Inc. All rights reserved • 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 PA UT unit – On-board software tools allowing for efficient and reliable interpretation of inspection data Recommended PA UT Solution 4
  5. 5. © Zetec Inc. All rights reserved • 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 Inspection Technique 5
  6. 6. © Zetec Inc. All rights reserved • Encoded rotation, manually driven • Adjustable radial probe position • Spring-loaded probe for adequate coupling • Simple, efficient cable management • Fits onto a range of hex nuts Dedicated Manual Scanner 6
  7. 7. © Zetec Inc. All rights reserved • 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 for setup, recording and full data analysis • 2GByte data files on-board • Reporting Feature 7
  8. 8. © Zetec Inc. All rights reserved Results on Test Bolt 8 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
  9. 9. © Zetec Inc. All rights reserved Results on Test Bolt 9 Notches 1 and 2, close to the echo from the bolt geometry, are well resolved by using the Linked B-Scan View; detection from A-scan only is challenging
  10. 10. © Zetec Inc. All rights reserved Results on Test Bolt 10 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
  11. 11. © Zetec Inc. All rights reserved Results on Test Bolt 11 Notch 7, only 0.06” deep, and located in close proximity of the back wall, can be clearly resolved from the geometry
  12. 12. © Zetec Inc. All rights reserved Results on Test Bolt 12 3D imaging of phased array UT data in riser bolt CAD model, generated with UltraVision Classic 3D software, facilitates data interpretation by end users
  13. 13. © Zetec Inc. All rights reserved • 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 13