MFL-COMBO Tools Technology and Experiences

Transcription

1 MFL-COMBO Tools Technology and Experiences Operation and inspection of infield pipelines Stavanger, 9 th of December 2009 Hubert Lindner ROSEN Technology and Research Center

2 Combo Tools - Technologies Pipeline Threads Metal Loss Geometry Cracks

3 Combo Tools - Technologies Introduction The combination of inspection technologies... improves the performance... extend the application range of the pipeline inspection The combination of inspection technologies... reduce the operational risk... is cost effective

4 Combined evaluation of independent measurements Accuracy two independent methods improvement of accuracy: α comb = 1 2 α 2 UT + α 2 MFL Inspection 1 (UT) [LEVENSON 2000] Probability of Identification two independent methods improvement of POI: P com [PITMAN 1993] Improvement = 1 (1 P ) (1 P ) Inspection 2 (MFL) UT MFL

5 Combo Tools - Focus MFL High Resolution MFL

6 Combo Tools - High Quality Inspection Operation at Magnetic Saturation: ka/m Residual Magnetization after MFL Inspection B (T) Magnetization Remnant Magnetization Range of Operation for MFL investigation Exciting Magnetic Field H (ka/m)

7 Combo Tools - High Quality Inspection Importance of Magnetic Saturation signal to noise ratio is improved reduced spurious effects (stress, remnant magnetization, speed effects) saturated! H = 18 ka/m insufficient! H = 7 ka/m

8 Combo Tools - Saturation and Tool Speed Magnetic Saturation Non Saturated

9 Combo Tools - AFD measurement principle Magnetization in circumferential direction 6 56 : 14 Tool sizes Resolution: 2.9 mm Detection of small axially orientated features Axial Flaw Detection Tool Thomas Beuker August-2008

10 Combo Tools - AFD 40 with active Speed Control 168 Carrier => 1344 Channels Axial Flaw Detection Tool Thomas Beuker August-2008

11 Combo Tools - Pipe Body General Corrosion Heavy Seamless Pipe AFD CDP Axial Flaw Detection Tool Thomas Beuker August-2008

12 Combo Tools - Focus Geometry High Resolution MFL extended Resolution Geometry

13 The Solution on Accuracy ROSEN Contour Following Proximity Sensor (Compensated Deflection) δ Radius Measurement = β δ Touchless Proximity Sensor + β Electronic Angle Sensor

14 Combo Tools - Focus Geometry Inspection extended Resolution Geometry Tools gouge with dent RoGeo Xt 42

15 Combo Tools Geometry Inspection 16 Anchor Damage XGP 14 /18 Data

16 Combo Tools - Focus Corrosion shallow internal corrosion (SIC) High Resolution MFL extended Resolution Geometry

17 Combo Tools Shallow Internal Corrosion (SIC) SIC Sensor (reality) SIC Sensor (schematic) Sensor over full pipewall Sensor over metal loss Amplitude change Phase movement Pipe wall

18 Combo Tools SIC and MFL Sample pipe of 30 mm WT. +/- 10% WT +/- 3% WT Defect range covered by each sensor type: +/- 10% WT +/- 3.0 mm DxD +/- 1.6% WT +/- 0.5 mm SIC Depth Sizing Accuracy

19 Combo Tools - Shallow Internal Corrosion (SIC) Sensitivity of SIC Measurement

20 Combo Tools - Shallow Internal Corrosion (SIC) Combined MFL/SIC Typical Applications: -Heavy Wall Pipelines -Baseline Surveys RoCorr MFL/SIC 24

21 Combo Tools - Top of Line Corrosion 16 External AUT MFL SIC erential Circumfe

22 Combo Tools - Focus Corrosion shallow internal corrosion (SIC) High Resolution MFL extended Resolution Geometry Ultrasonic Metal Loss Inspection

23 Combo Tools - Focus Corrosion probability of detection wall thickness confidence level general wall thinning accuracy length, width small pitting probability of identification pinholes installations

24 Example - Probability of Detection Different Properties UT/MFL Debris or wax on the pipe wall can affect measurements Missed Calls Echo Loss deep external feature require minimum wall thickness pipe wall cleaning by MFL brushes signal dimension defect dimension redundancy by MFL signal

25 Example - Probability of Identification Identification of Features (UT/MFL) Lamination ultrasonic testing is sensitive to 2-dim. interfaces MFL signals are proportional to volume loss Lamination with cavity, 56% loss of the pipewall

26 Combo Tools - Focus Cracks shallow internal corrosion (SIC) High Resolution MFL EMAT Crack Detection extended Resolution Geometry Ultrasonic Metal Loss Inspection

27 Combined Inspection Improved Performance Summary The combination of different inspection technologies enlarges the application range The combination of different inspection technologies improves the characterization and accuracy for features addressed by both technologies MFL and UT are complementary in many aspects and therefore beneficial in combination The combination of Geometry Inspection with MFL and SIC is providing new inspection possibilities Both MFL/UT and MFL/SIC are well applicable for Baseline Inspections

28 Thank You LEADING IN INSPECTION TECHNOLOGIES