1 / 22

ILIA View: In-Line Inspection State-of-the-Art For SCC Presented by: Scott Thetford Manager- Government Relations GE-PI

Introduction. Current ILI Technologies applied to SCC DetectionNext Generation SCC ILI. Current Applied ILI Technologies . Magnetic Flux LeakageAxialTransverseUltrasonicShear waveElectromagnetic Acoustic Transducer. Magnetic Flux Leakage. Goal: Detection of gross SCCMFL Coupled with oth

yaholo
Download Presentation

ILIA View: In-Line Inspection State-of-the-Art For SCC Presented by: Scott Thetford Manager- Government Relations GE-PI

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    2. Introduction

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

    4. Magnetic Flux Leakage 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.

    7. Magnetic Flux Leakage

    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. UltraSonic Shear Wave Crack Detection 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%

    10. UltraSonic Shear Wave Crack Tools

    11. 16”-20” Tool in Service

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

    13. Single Crack Feature

    15. 10” to 14” Now in Service

    17. EMAT Goals 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.

    18. Wave types Emat The EmatScan® CD tool uses a combination of three different ultrasonic wave types: (a) SH Waves Shear Waves, propagating through the center of the pipe wall, oscillating horizontally (i.e. the plane parallel to the coil surface). These waves are used for crack detection and their depth sizing. (b) RH Waves Rayleigh Waves travel along the internal surface of the pipe wall whilst oscillating horizontally. This wave type is used for internal/external discrimination. (c) TS Wave Transverse Shear waves, traveling perpendicularly across the pipe wall. These waves measure the local wall thickness and are used for girth weld recognition. The EmatScan® CD tool uses a combination of three different ultrasonic wave types: (a) SH Waves Shear Waves, propagating through the center of the pipe wall, oscillating horizontally (i.e. the plane parallel to the coil surface). These waves are used for crack detection and their depth sizing. (b) RH Waves Rayleigh Waves travel along the internal surface of the pipe wall whilst oscillating horizontally. This wave type is used for internal/external discrimination. (c) TS Wave Transverse Shear waves, traveling perpendicularly across the pipe wall. These waves measure the local wall thickness and are used for girth weld recognition.

    20. Real feature: SCC Emat Beside machined defects tests with real stress corrosion cracking, single cracks and laminations were carried out. This is an example for a SCC-field excavated as a result of a UltraScan CD inspection. NDT measurements verified the results 4.5 mm deep and 300 mm long feature. This pipe section was inspected by the EmatScan CD tool. The visualization in the B-Scan demonstrates that this defect was clearly detected as a SH pulse echo signal and also as a SH transmission signal drop.Beside machined defects tests with real stress corrosion cracking, single cracks and laminations were carried out. This is an example for a SCC-field excavated as a result of a UltraScan CD inspection. NDT measurements verified the results 4.5 mm deep and 300 mm long feature. This pipe section was inspected by the EmatScan CD tool. The visualization in the B-Scan demonstrates that this defect was clearly detected as a SH pulse echo signal and also as a SH transmission signal drop.

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

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

    23. Thank you. www.ILIAssociation.org

More Related