Inline Geometry Sensor Using Hall Effect for Pipeline Dent Sizing
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Solution Overview
Problem
Current inline inspection tools for pipelines and conduits are inadequate in accurately detecting geometric defects such as cracks, pitting, and dents, as well as determining the structural integrity of the pipe, due to limitations in magnetic flux leakage and geometry measurement capabilities.
Innovation Solution
The magnetic flux leakage inline inspection tool employs a combination of magnets, Hall effect sensors, and a geometry sensor with pivotally attached arms and magnets to measure magnetic field changes and arm movement, allowing for precise detection of defects and calculation of dent size and impact on structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic flux leakage sensors are used to detect defects, then defect detection capability is improved, but measurement precision for geometric defects deteriorates
Solution Approach 1:
The inspection tool is divided into separate functional sections: a magnetizer section for magnetic flux leakage detection and a geometry sensor section for geometric defect detection. This segmentation allows each section to specialize in its specific detection function, with the magnetizer using magnets and Hall effect sensors for magnetic defects, and the geometry sensor using contact arms for precise geometric measurements, thereby resolving the contradiction between general defect detection and precise geometric measurement
Solution Approach 2:
The inspection tool is designed as a multi-functional device that combines both magnetic flux leakage detection and geometric defect detection capabilities in a single tool. The magnetizer section with Hall effect sensors detects magnetic defects, while the geometry sensor section with contact arms detects geometric defects, allowing the tool to perform multiple detection functions simultaneously without compromising the precision of either measurement type
2Measurement precision
If Hall effect sensors are used to measure magnetic field changes, then defect localization is improved, but device complexity increases
Solution Approach 1:
The Hall effect sensors are integrated into the magnetizer section along with the magnets in a compact arrangement. The sensors are positioned to detect magnetic field changes as the tool moves through the pipe, and the data is processed to locate defects. This merging of magnetic field generation and detection functions in a single section reduces overall device complexity while maintaining precise defect localization capability
Solution Approach 2:
The Hall effect sensors act as intermediary devices that convert magnetic field changes into electrical signals for processing. By using these sensors as mediators between the magnetic field and the data processing system, the tool achieves precise defect localization without requiring complex direct measurement mechanisms, thereby managing device complexity effectively
3Measurement precision
If contact arms are used to measure pipe geometry, then geometric defect detection is improved, but reliability for structural integrity assessment deteriorates
Solution Approach 1:
The inspection tool combines both magnetic flux leakage detection and geometric defect detection in a single multi-functional device. The magnetizer section assesses structural integrity through magnetic field analysis, while the geometry sensor section detects geometric defects through contact measurement. By merging these complementary detection methods, the tool achieves both precise geometric defect detection and reliable structural integrity assessment, resolving the contradiction between the two measurement goals
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 solution enables accurate localization and sizing of defects, improving the assessment of pipeline integrity by providing detailed data on defects and their impact on the structural integrity of pipelines and conduits.
Implementation Method 1
A magnet 54 is mounted on the arm 36, at or near the pivotal connection to the base 52. A Hall effect sensor 62 is mounted on the geometry sensor section 40
Implementation Method 2
The magnets 32 create the magnetic field in the pipe 28. The Hall effect sensors 34 measure the magnetic field in the pipe 28 and search for magnetic field leakage caused by defects
Data Source
AI summary
An improved geometry sensor for an inline inspection tool used for determining defects in a pipe or other conduit. The sensor having an arm pivotally mounted to a base on a body of an inline inspection tool and a spring biasing the arm away from the body of the inline inspection tool. A magnet mounted to the arm, the magnet having a magnetic field. A Hall effect sensor fixed relative to the body of the of the inline inspection. The outer end of the arm moves along an interior surface of a conduit as the tool passes through a pipe with the arm and magnet pivoting relative to the body and the Hall effect sensor detecting movement and deflection of the arm by measuring changes in the magnetic field.