Piezoelectric Wire Cathodic Protection Unit for Pipeline Monitoring
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Solution Overview
Problem
Conventional current sensors for oil piping systems are invasive, sensitive to vibrations and electromagnetic radiation, and unable to measure global parameters, leading to unreliable cathodic protection and corrosion monitoring.
Innovation Solution
A cathodic protection unit utilizing a piezoelectric wire that measures pipe wall strain, coupled with the acoustic field and pressure, transmitting data to the cloud for global monitoring and fault detection, leveraging artificial intelligence and machine learning for predictive maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Hall effect sensors are used to measure current in pipes, then current measurement is achieved, but the device becomes sensitive to earth's magnetic field and electromagnetic radiation
Solution Approach 1:
The patent replaces the Hall effect sensor (electromagnetic measurement device) with a piezoelectric wire that measures mechanical strain on the pipe wall. This substitution eliminates sensitivity to magnetic fields and electromagnetic radiation while maintaining measurement capability through a different physical principle (piezoelectric effect responding to mechanical deformation).
Solution Approach 2:
The piezoelectric wire acts as an intermediary element that indirectly measures current by detecting strain on the pipe wall caused by electrochemical corrosion processes. Instead of directly measuring electrical current, the system uses the wire to sense mechanical effects correlated with corrosion, thereby avoiding direct exposure to electromagnetic interference.
2Measurement precision
If Hall sensors are used for current measurement, then current level can be monitored, but the device is fragile and only measures at one axial location
Solution Approach 1:
The piezoelectric wire serves multiple functions: it measures strain at multiple locations along its length, provides cathodic protection through electrical connection to the pipe, and detects various pipeline parameters including pressure and acoustic signals. This multi-functionality replaces the single-location, single-purpose Hall sensor.
Solution Approach 2:
The piezoelectric wire is a flexible, thin-element sensor that can conform to the pipe surface and measure strain continuously along its length rather than at a single point. This flexible design eliminates the fragility issue of conventional Hall sensors while providing distributed measurement coverage.
3Loss of information
If invasive sensors are used to measure internal pipe conditions, then internal parameters can be detected, but the pipe is damaged
Solution Approach 1:
The patent uses acoustic field measurements and strain detection on the external pipe surface to infer internal conditions such as fluid pressure, flow characteristics, and corrosion processes. This mechanical/acoustic substitution eliminates the need for invasive probes that would penetrate the pipe wall and compromise structural integrity.
4Measurement precision
If conventional sensors are used for pipeline monitoring, then some parameters can be measured, but the devices are sensitive to vibrations and shock
Solution Approach 1:
The piezoelectric wire measures strain as its primary parameter, which is a mechanical deformation that can be distinguished from vibration and shock through signal processing. By changing the measurement parameter from electrical fields (Hall effect) to mechanical strain, the system becomes inherently more resistant to electromagnetic interference and certain types of environmental disturbances.
5Ease of operation
If a single conventional sensor device is used, then installation is simple, but it cannot measure or monitor all parameters at once
Solution Approach 1:
The piezoelectric wire is designed as a multi-functional sensor that simultaneously measures strain, detects acoustic signals, monitors pressure variations, and provides cathodic protection. This single device replaces multiple specialized sensors while maintaining installation simplicity, as the wire can be applied to the pipe exterior without complex assembly.
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 solution provides non-invasive, robust, and cost-effective cathodic protection with real-time monitoring of multiple pipeline parameters, predicting corrosion and preventing failures, while minimizing downtime and maintenance costs.
Implementation Method 1
The cathodic protection unit (12) uses a piezoelectric wire (14) to directly measure the pipe wall (P) strain
Implementation Method 2
the sensor wire (14) uses the voltage and pipe (P) resistance to calculate current
Implementation Method 3
the clamp (16) is attached to the pipe exterior (P), the conducting wire (14) makes contact with the pipe (P) exterior surface via a slight clamping pressure
Data Source
AI summary
A cathodic protection unit (12) utilizes a signal generated by a conducting wire (14) inserted into a clamp body (16) after the clamp (16) is attached to a pipe (P). The wire (14) wraps a complete number of turns around the clamp structure. When the clamp is attached to the exterior of the pipe (P), the conducting wire (14) makes contact with the pipe (P) via a slight clamping pressure. Analyzing two signals generated by separate conducting wires (14) are used for cathodic protection.