OAE Stress Probe Axial Pipe Detection
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Solution Overview
Problem
Current methods for detecting axial stress in oil and gas pipelines are ineffective for rapid, whole-pipeline assessment, particularly in environments with unstable ground conditions.
Innovation Solution
The method employs orthogonal alternating electromagnetism (OAE) to generate an alternating magnetic field on the pipeline surface, magnetizing it and allowing for the detection of axial pipe stress through changes in the magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional strain gauge monitoring methods are used to detect axial stress, then local point detection can be achieved, but the detection speed is slow and the whole pipeline cannot be quickly assessed
Solution Approach 1:
The patent replaces the mechanical strain gauge system with an electromagnetic detection system. The OAE device uses alternating magnetic fields to induce eddy currents in the pipe wall, which interact with residual magnetization to produce detectable voltage signals proportional to axial stress. This substitution enables full-pipeline detection without mechanical contact, dramatically increasing detection speed while maintaining measurement precision.
Solution Approach 2:
The patent employs electromagnetic fields (analogous to fluid fields in pneumatic/hydraulic systems) to penetrate and interact with the pipe structure. The alternating magnetic field penetrates the pipe wall, induces eddy currents, and interacts with magnetized regions to produce detectable signals, enabling non-contact, rapid detection along the entire pipeline.
2Measurement precision
If excavation-based ultrasonic stress measurement is performed, then accurate stress measurement can be achieved, but the process is time-consuming and cannot cover the whole pipeline
Solution Approach 1:
The patent replaces excavation-based ultrasonic measurement with an electromagnetic detection system that operates on the pipe surface without excavation. The OAE device generates alternating magnetic fields that penetrate the pipe wall and interact with the stressed material, producing detectable voltage signals. This eliminates the time-consuming excavation process while maintaining measurement accuracy through electromagnetic interaction with the stressed pipe structure.
Solution Approach 2:
The patent enables continuous detection along the entire pipeline by moving the OAE device along the pipe surface. The alternating magnetic field continuously interacts with the pipe structure as the device moves, providing uninterrupted stress measurement data along the full pipeline length without stopping for excavation or repositioning heavy equipment.
3Reliability
If strain gauges are pasted on the pipe surface, then local stress monitoring can be performed, but the method cannot detect the stress level of the entire pipeline efficiently
Solution Approach 1:
The patent creates a universal detection system that can monitor stress along the entire pipeline using a single OAE device. The device generates alternating magnetic fields that interact with the pipe structure regardless of location, providing consistent stress measurement capability throughout the pipeline. This eliminates the need for multiple strain gauge installations and complex data integration from numerous local sensors.
Solution Approach 2:
The patent replaces the complex system of multiple strain gauge installations, adhesives, and wiring with a single electromagnetic detection device. The OAE system uses alternating magnetic fields to interact with the pipe structure, eliminating mechanical attachment requirements and reducing system complexity while maintaining reliable stress monitoring across the entire pipeline.
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 approach enables high-speed, whole-pipeline axial stress detection, providing an effective means to identify and repair stress-concentrated areas, thus ensuring pipeline safety.
Implementation Method 1
generating an alternating magnetic field on a surface of the pipe to be detected by a high-frequency alternating current output by an OAE stress probe
Implementation Method 2
magnetizing a surface of the pipe to be detected according to the alternating magnetic field
Implementation Method 3
detecting the axial pipe stress of the pipe to be detected when a range of the alternated magnetic field generated on the surface of the pipe to be detected is smaller than a range of the stress generated by a deformation
Data Source
AI summary
A method for detecting an axial pipe stress based on the orthogonal alternating electromagnetism (OAE) includes: acquiring a material of the pipe to be detected and determining an excitation intensity corresponding to the pipe to be detected according to the material of the pipe to be detected; generating an alternating magnetic field on the surface of the pipe to be detected by a high-frequency alternating current output by an OAE stress probe in a system for detecting the axial pipe stress based on the OAE according to the excitation intensity; magnetizing the surface of the pipe to be detected according to the alternating magnetic field; and when the variation range of the magnetized alternating magnetic field is smaller than the set range, determining the axial pipe stress of the pipe to be detected by the system for detecting the axial pipe stress based on the OAE.