Design and Performance Study of a Magnetic Flux Leakage Pig for Subsea Pipeline Defect Detection
Abstract
1. Introduction
2. Theoretical Basis of Magnetic Flux Leakage Detection
2.1. Principles of In-Line Magnetic Flux Leakage Detection
2.2. Theoretical Calculation Methods for Magnetic Flux Leakage Fields
3. Numerical Model Development
3.1. Establishment of the Geometric Model
3.2. Material Property Definition
3.3. Mesh Generation
4. Analysis of Defect-Induced Magnetic Flux Leakage Field Distribution Characteristics
4.1. Influence of Defect Geometry on Magnetic Flux Leakage Signals
4.1.1. Defect Shape
4.1.2. Defect Longitudinal Length
4.1.3. Defect Radial Depth
4.2. Regulation of Magnetic Leakage Signals by Excitation Intensity
4.3. Sensitivity of Magnetic Leakage Signals to Sensor Lift-Off Value
4.4. Dynamic Influence of Operating Speed on Magnetic Leakage Signals
5. Design of the Magnetic Leakage Detection System
5.1. Design of the Magnetization Module
5.1.1. Structural Design
5.1.2. Magnetic Circuit Design
5.2. Development of the Signal Acquisition Module
5.3. Integration of the Control System
5.3.1. Main Control Chip
5.3.2. Signal Processing Module
5.3.3. Positioning Information Acquisition Module
5.3.4. Data Storage Module
5.3.5. Control System Circuit Design
6. Experimental Validation
6.1. Simulation Setup
6.2. Defect Sample Preparation
6.3. Experimental Results and Analysis
6.3.1. Effect of Rectangular Defect Radial Depth on Magnetic Leakage Signals
6.3.2. Effect of Axial Length of Rectangular Defects on Magnetic Leakage Signals
6.3.3. Effect of Rectangular Defect Lift-Off Value Variations on Magnetic Leakage Signals
6.4. Comparative Validation of Experimental and Simulation Results
7. Conclusions and Outlook
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Remanent Magnetic Induction Intensity | HcB (Normal Coercivity) | HcJ (Intrinsic Coercivity) | Intrinsic Coercivity | Maximum Magnetic Energy Product | |||||
---|---|---|---|---|---|---|---|---|---|
Max | Min | Min (kA/m) | Min (kOe) | Min (kA/m) | Min (kOe) | kOe | kA/m | Max | Min |
14.8 kGs | 14.6 kGs | 950 | 11.5 | 900 | 9.6 | ≥9.6 | ≥900 | 52 MGOe | 50 MGOe |
1.48 T | 1.46 T | 400 kJ/m3 | 380 kJ/m3 |
Parameter Name | Symbol |
---|---|
Permanent Magnet Length | ly |
Permanent Magnet Width | wy |
Permanent Magnet Thickness | hy |
Steel Brush Thickness | hg |
Yoke Thickness | he |
Distance Between the Steel Brush on One Side and the Pipeline at the Defect | Lgg |
Defect Length | Lq |
Defect Width | Wq |
Defect Height | Hq |
Pipeline Thickness | Hp |
Magnetic Sensor | Advantages | Disadvantages |
---|---|---|
Induction Coil | Adjustable measurement sensitivity, sensitive to high-frequency magnetic signals | Highly susceptible to operating speed, complex signal processing |
Fluxgate Sensor | Extremely high detection sensitivity | Large space requirement, suitable only for weak magnetic fields |
Hall Element | Small space requirement, directly reflects magnetic field strength, unaffected by operating speed | Requires a power supply circuit, relatively high detection sensitivity |
Magnetic Diode | Extremely high detection sensitivity | Significantly affected by temperature |
Magnetoresistive Sensor | Extremely high detection sensitivity | Suitable only for weak magnetic fields |
Model | SS495A |
---|---|
Dimensions | 4 × 3 × 2.5 mm |
Operating Voltage | 5 V |
Linear Range | −67~+67 mT |
Sensitivity | 3.125 ± 0.125 mV/G |
Linearity Error | 1.0% |
Temperature Error | ±0.06% °C |
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Qu, F.; Chen, S.; Zhang, M.; Zhang, K.; Gong, Y. Design and Performance Study of a Magnetic Flux Leakage Pig for Subsea Pipeline Defect Detection. J. Mar. Sci. Eng. 2025, 13, 1462. https://doi.org/10.3390/jmse13081462
Qu F, Chen S, Zhang M, Zhang K, Gong Y. Design and Performance Study of a Magnetic Flux Leakage Pig for Subsea Pipeline Defect Detection. Journal of Marine Science and Engineering. 2025; 13(8):1462. https://doi.org/10.3390/jmse13081462
Chicago/Turabian StyleQu, Fei, Shengtao Chen, Meiyu Zhang, Kang Zhang, and Yongjun Gong. 2025. "Design and Performance Study of a Magnetic Flux Leakage Pig for Subsea Pipeline Defect Detection" Journal of Marine Science and Engineering 13, no. 8: 1462. https://doi.org/10.3390/jmse13081462
APA StyleQu, F., Chen, S., Zhang, M., Zhang, K., & Gong, Y. (2025). Design and Performance Study of a Magnetic Flux Leakage Pig for Subsea Pipeline Defect Detection. Journal of Marine Science and Engineering, 13(8), 1462. https://doi.org/10.3390/jmse13081462