Variable-Diameter RFEC Sensor Shoe for Pipeline Inspection
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Solution Overview
Problem
Current pipeline inspection methods, such as remote-field eddy current (RFEC) sensing, face challenges in effectively detecting defects like material loss and cracking within pipe walls while navigating through tight spaces and varying pipe diameters, as they often require rigid equipment that cannot easily expand or contract to fit through obstructions.
Innovation Solution
A pipeline inspection device with an exciter coil generating alternating current magnetic fields and sensors that can adjust their radial distance from the pipe wall, retracting to fit through restrictions, and expand to maintain contact with the pipe surface, utilizing a sensor shoe and support arm mechanism to accommodate different diameters and angles, allowing for comprehensive defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rigid RFEC equipment is used for pipeline inspection, then defect detection capability is maintained, but the device cannot pass through pipeline internal restrictions or bends
Solution Approach 1:
The inspection device incorporates a dynamic support arm mechanism that can extend and retract. The support arm pivots at multiple joints (fixed hub, driven hub) allowing the sensor shoe to dynamically adjust its radial position. This enables the device to transition between extended configuration for inspection and retracted configuration for navigating restrictions, resolving the contradiction between adaptability and structural complexity.
2Ease of operation
If the sensor shoe is positioned at a greater radial distance from the pipe wall, then the device can traverse restrictions more easily, but coupling to the magnetic field decreases
Solution Approach 1:
The sensor shoe's radial position is dynamically adjustable through the support arm mechanism. During traversal of restrictions, the sensor shoe retracts to reduce diameter and ease passage. During inspection phases, the sensor shoe extends to maximize radial distance from the pipe wall, optimizing magnetic field coupling. This dynamic positioning resolves the contradiction between ease of operation and measurement precision.
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
Enables detailed inspection of pipe defects with improved ability to traverse bends and obstacles, providing thorough coverage of the pipe circumference with a single pass while maintaining contact with the pipe wall, enhancing defect detection accuracy and adaptability to varying pipe geometries.
Implementation Method 1
an electromagnetic excitation coil driven by alternating current that may be positioned within a pipe
Implementation Method 2
RFEC sensing is a generally nondestructive testing method that may be used for inspecting pipelines
Implementation Method 3
The magnetic field has penetrated the pipe wall, it may be affected by defects such as cracking or material loss
Data Source
AI summary
The present disclosure relates to a device and method for pipeline inspection, The inspection device may include an exciter coil capable of providing an alternating current magnetic field and producing eddy currents. A plurality of sensors may then be provided which are capable of sensing a magnetic field produced by the eddy currents and the sensors may be engaged with a sensor shoe. The sensors may then be capable of being positioned at a first distance D1 with respect to an inner pipe wall surface and capable of providing coupling to the magnetic field produced by the eddy currents. The sensor shoe may also be capable of retracting to a second distance D2, wherein D1<D2. The sensor shoe may be connected to a sensor support arm wherein the support arm may be pivotably attached to a fixed hub and to a control arm which control arm may then be pivotably attached to a driven hub.