Magnetic Tomography for Pipeline Defect Detection
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Solution Overview
Problem
Current methods for inspecting and maintaining metallic structures, particularly pipelines, are inefficient in detecting defects in hard-to-reach areas and fail to provide real-time alerts for potential failures, leading to inadequate prioritization of repairs and increased risk of costly failures.
Innovation Solution
A magnetographic method using magnetic tomography that employs a sensor array to measure magnetic field anomalies, allowing for non-destructive, remote identification of defects and their risk factors, and provides real-time alerts through graphical visualization of mechanical stress, enabling accurate maintenance scheduling without the need for extensive preparation or magnetization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional in-line inspection (pigging) devices are used to detect defects in pipelines, then defect detection capability is improved, but the method becomes expensive, labor-consuming, and requires extensive preparation including high residual level magnetization and input/output chambers
Solution Approach 1:
The patent replaces the mechanical pigging inspection system with a magnetic field-based non-contact measurement system. Magnetic sensors detect defects by measuring magnetic field anomalies caused by stress concentrations at defect locations, eliminating the need for mechanical insertion devices and their associated preparation requirements.
Solution Approach 2:
The patent introduces magnetic field as an intermediary medium to detect pipeline defects. By applying a magnetic field to the pipeline and measuring anomalies in the field caused by defects, the system indirectly detects defects without direct contact, avoiding the complexity of physical inspection devices.
2Measurement precision
If pigging devices are used for pipeline inspection, then defect detection is improved, but the method requires significant time for magnetization preparation and future demagnetization for repair
Solution Approach 1:
The patent replaces the time-consuming mechanical magnetization-demagnetization process with a non-contact magnetic field measurement approach that requires no preparation time and no post-inspection demagnetization, enabling immediate inspection and repair operations.
3Measurement precision
If in-line inspection methods are used, then flaw detection is improved, but the method is less efficient for risk-factor evaluation and defective pipeline serviceability calculation
Solution Approach 1:
The patent enhances local measurement quality by using magnetic sensors to detect not only the presence of defects but also the local stress state and magnetic properties at defect locations. This provides detailed information about defect severity, risk factors, and serviceability that cannot be obtained by standard flaw detection alone.
Solution Approach 2:
The patent implements a feedback mechanism where magnetic field measurements provide real-time information about defect characteristics, enabling continuous assessment of risk factors and serviceability. The system uses the measured magnetic anomalies to evaluate defect severity and provide feedback for maintenance decision-making.
4Measurement precision
If pipeline inspection requires high residual level magnetization, then defect detection sensitivity is improved, but technical problems of pipeline demagnetization arise for actual pipe repair
Solution Approach 1:
The patent replaces the magnetization-based detection system with a non-contact magnetic field measurement system that does not alter the pipeline's magnetic state. This eliminates the need for demagnetization procedures, making repair preparation simple and straightforward without special magnetic control requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances the reliability and accuracy of defect detection and repair planning, reduces maintenance costs, and allows for real-time monitoring of pipeline integrity, ensuring timely interventions and minimizing operational disruptions.
Implementation Method 1
a sensor array registering a signal, a signal representing a density of magnetic field strength distribution along the metallic structure
Implementation Method 2
This identification is based on a magnetic tomography method that employs a known inverse magnetostrictive Villary effect
Implementation Method 3
a magnetic tomography method that employs a known inverse magnetostrictive Villary effect of changing the magnetic susceptibility under applied mechanical stress resulting in distribution of magnetic field gradient along the structure surface
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
A method for metallic structure maintenance is disclosed. The method includes a magneto-graphic/Magnetic Tomography technique to identify stress-related defects. The method is specifically optimized for extended, non-accessible underground and underwater metallic structures in providing quality control, emergency alarms as well as timeline planning for structural repairs and maintenance work. Examples of the method implementation include pipes for oil and gas industry, detection of flaws in rolled products in metallurgical industry, welding quality of heavy duty equipment such as ships reservoirs, etc. It is especially important for loaded constructions, such as pressured pipes, infrastructure maintenance, nuclear power plant monitoring, bridges, corrosion prevention and environment protection.