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State-of-the-Art In-Line Inspection for SCC Detection

Explore the latest in SCC detection technologies, from Magnetic Flux Leakage to Ultrasonic Shear Wave tools. Learn about crack detection capabilities, tool sizes, and goals for next-generation ILI applications.

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State-of-the-Art In-Line Inspection for SCC Detection

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  1. ILIA View: In-Line Inspection State-of-the-Art For SCC Presented by: Scott Thetford Manager- Government Relations GE-PII OPS Workshop on SCC December 2, 2003 Houston, Texas

  2. Introduction • Current ILI Technologies applied to SCC Detection • Next Generation SCC ILI

  3. Magnetic Flux Leakage Axial Transverse Ultrasonic Shear wave Electromagnetic Acoustic Transducer Current Applied ILI Technologies

  4. Goal: Detection of gross SCC MFL Coupled with other data sources Axial + Transverse Axial + Elastic Wave (Wheel Coupled Shear Wave) MFL + DA While results have been good more effort needs to be applied to understand limitations. Magnetic Flux Leakage

  5. Feature seen by Transverse Field Inspection

  6. Feature Seen by Axial is Small to non-existent

  7. Magnetic Flux Leakage Axial Field + Transverse Field = Gross SCC Screening Application

  8. Different tools for liquid and gas pipelines Liquid Coupled UltraSonic Shear Wave – for liquid lines (Natural Gas lines with batching) Emat – for gas pipelines Liquid filled wheel probes – for gas or liquid High resolution tools for detection and sizing of smallest cracks of all types Ideal for monitoring crack growth Detection of hairline cracks Ultrasonic Technologies

  9. Outline of Detection Capabilities: Minimum crack length of 30 mm Length accuracy +/- 5 mm Minimum crack depth of 1 mm (2mm for mid-wall cracks) Longitudinal orientation within +/- 10o Depth categorized as < 12.5% 12.5% to 25% 25% to 40% > 40% of wall thickness Probability of Detection > 90% UltraSonic Shear Wave Crack Detection

  10. UltraSonic Shear Wave Crack Tools Tool size range • Until 2001: 24”+ diameter • 2001 16” – 20” • 2003 10” – 14” • Challenge: space restriction in small diameters

  11. Sensor Carrier Array Launch into tool trap 16”-20” Tool in Service

  12. Detected by Ultrasonic Crack Detection Excavation comparison Excellent prediction in size and shape Stress Corrosion Cracking

  13. Single Crack Feature

  14. SCC Field • SCC featureclose-up • Excavation vs. tool prediction

  15. 10” to 14” Now in Service

  16. Detection of sub-critical SCC Determination of length and depth of axial cracks Operate without a liquid couplant Cost-effective inspection Discriminate int./ext.& injurious/non-injurious Full wall coverage Robust and reliable design Similar detection targets to UltraSonic Shear Wave Crack Detection Tools. EMAT Goals

  17. Wave types Emat

  18. UltraSonic Shear Wave • Emat SCC Detection- Live Line

  19. Real feature: SCC Emat length 300 mm, depth 4.5 mm

  20. Automated Feature Analysis. Increased Feature Database = Increased accuracy of failure models. Cracking and Corrosion Combination Tools. Other Sensor Developments Gas coupled ultrasonic Eddy current Next Generation SCC ILI

  21. ILI Association – founded April 2002 www.ILIAssociation.org

  22. Thank you.www.ILIAssociation.org

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