Arched Triaxial Sensor Head for Inline Pipe Wall Tracking
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Solution Overview
Problem
Existing inline pipe inspection (ILI) tools with rectangular sensor heads struggle to track features like dents and wrinkles due to their large contact area, leading to incomplete inspection around weld intrusions, as they pull away from the pipe wall, and lack the capability to utilize triaxial hall effect sensors for improved defect characterization.
Innovation Solution
An inline pipe inspection tool with a sensor module featuring a curved or arched pipe contact surface and integrated triaxial sensing elements that maintain continuous contact along a single line of travel, allowing for enhanced tracking of pipe geometry and collection of flux data in all three axes, thereby improving defect identification and characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rectangular sensor head with large contact area is used, then multiple axis flux measurements can be achieved, but the sensor head cannot track features like dents and wrinkles and pulls away from the pipe wall at weld intrusions
Solution Approach 1:
The sensor head contact surface is changed from a rectangular flat surface to a curved surface with a predetermined radius. This curvature allows the sensor head to conform to the cylindrical geometry of the pipe wall, enabling continuous tracking of pipe features such as dents and wrinkles while maintaining reliable contact during traversal, thereby resolving the tracking reliability issue while preserving multi-axis measurement capability
Solution Approach 2:
The sensor head is divided into a curved contact surface portion that interfaces with the pipe wall and a sensing element portion that performs measurements. This segmentation allows the contact surface to be optimized for tracking (curved geometry) while the sensing elements maintain their measurement function, separating the conflicting requirements of tracking reliability and measurement precision
2Loss of information
If an array of single axis hall effect sensors is used, then multiple axis flux measurements can be achieved, but the rectangular head shape causes loss of inspection around weld intrusions and pipe features
Solution Approach 1:
The curved contact surface ensures continuous contact with the pipe wall during traversal, preventing the sensor head from pulling away at weld intrusions and other features. This maintains uninterrupted flux data collection in all three axes, eliminating inspection losses while preserving complete multi-axis measurement capability
3Reliability
If triaxial hall effect sensors are integrated into a curved sensor head, then both pipe wall tracking and flux information are improved, but device complexity increases
Solution Approach 1:
Multiple triaxial hall effect sensing elements are integrated into a single curved sensor head module. This merging combines the tracking function (achieved through curved geometry) with the multi-axis measurement function (achieved through triaxial sensors) into one unified device, improving both reliability and information quality while managing complexity through integration rather than separate components
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
The triaxial sensor module enables reliable detection and sizing of volumetric features, resolving the historical tradeoff between pipe wall tracking and flux information, providing improved characterization of pipeline defects and maintaining contact with the pipe surface even at weld intrusions.
Implementation Method 1
Collection of flux data in all three axes offers improved capability to characterization of pipeline features and defects
Data Source
AI summary
An inline inspection tool of this disclosure includes at least one sensor arm (50) having a sensor head (30) located at its distal end (51), the sensor head including an arched-shaped pipe contacting portion (33) between its forward and rearward ends (32, 34), the pipe contacting portion having a radius R and a width WC; and at least one triaxial sensor element (31) having at least a portion located directly below the arched-shaped pipe contacting portion and having a width WS, WC<WS. During the tool's travel through a pipeline, contact of the sensor head with the pipe wall lies along a single line of travel substantially equal to the width WC. Because of its shape, the sensor head better traces and maintains contact with the pipe wall to detect dents, wrinkles, weld intrusions, and other defects or anomalies in the pipe wall.