Method of selectively interrupting a passive cathodic protection unit from a metallic structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cathodic protection systems for metallic structures in electrolytic media face challenges in accurately measuring pipe-to-soil potential due to interference from external currents, requiring power-intensive synchronization and external power sources, which increases costs and energy consumption.
Innovation Solution
A low-power consumption cathodic protection interruption system utilizing a local real-time clock and GPS receiver to synchronize the interruption of passive cathodic protection units, allowing for simultaneous and power-efficient measurement of pipe-to-soil potential without external power sources, using a battery as a local power source and remote monitoring units for wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external power sources and power-intensive synchronization systems are used to accurately measure pipe-to-soil potential, then measurement precision is improved, but energy consumption and system cost increase
Solution Approach 1:
The cathodic protection system uses its own inherent electrochemical reactions to generate the measurement current, eliminating the need for external power sources. The sacrificial anode naturally corrodes to provide protection current, which is simultaneously used for potential measurement, making the system self-sufficient and energy-efficient
Solution Approach 2:
The system performs measurements at specific intervals by periodically interrupting the cathodic protection current. The controller selectively interrupts current from specific galvanic anodes at predetermined times, allowing potential measurements to be taken during these interruption periods without requiring continuous external power
2Reliability
If external power sources are used for cathodic protection systems, then protection performance is improved, but system cost and complexity increase
Solution Approach 1:
The system uses sacrificial galvanic anodes that naturally corrode to provide protection current, eliminating the need for external power sources, rectifiers, and complex power management systems. The anodes self-regulate their current output based on their electrochemical properties and the protection needs of the metallic structure
Solution Approach 2:
The invention extracts and eliminates the external power source component from the cathodic protection system, relying instead on the inherent electrochemical energy of the sacrificial anodes. This simplifies the system by removing rectifiers, power cables, and external power infrastructure while maintaining protection effectiveness
3Reliability
If continuous cathodic protection current is applied, then protection coverage is improved, but measurement accuracy deteriorates due to current interference
Solution Approach 1:
The system implements periodic interruption of cathodic protection current from specific galvanic anodes to create measurement windows. The controller selectively interrupts current at predetermined times, allowing potential measurements to be taken during these brief interruption periods when current interference is minimized, while maintaining continuous protection from other anodes
Solution Approach 2:
The system divides the cathodic protection current source into multiple independent galvanic anodes that can be individually controlled and interrupted. This segmentation allows specific anodes to be taken offline for measurement purposes while others continue providing protection, enabling measurements without complete system shutdown
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 accurate and synchronized interruption of cathodic protection systems, reducing power consumption and costs by using a battery-powered system with wireless communication, effectively managing external current interference and maintaining balanced electrochemical protection.
Implementation Method 1
a global positioning system (GPS) receiver coupled with each test unit of the plurality of test units for receiving GPS time from at least one global positioning system satellite in data communication therewith
Implementation Method 2
Galvanic corrosion occurs on pipelines when two different metals are placed in physical or electrical contact with each other and are immersed in the soil. The more active metal, called the 'anode', corrodes at a faster rate and the more stable metal, called the 'cathode', corrodes at a slower rate.
Implementation Method 3
Cathodic protection (CP) makes the metal structure to be protected, in this case the pipeline, the cathode of an electrochemical cell. This may be done, for example, by connecting the pipeline to a metal object or structure which is more easily corroded to act as the anode of the electrochemical cell.
Data Source
AI summary
A method for changing an activation state of an interruption module for selectively interrupting at least one passive cathodic protection unit from a metallic structure. The method includes enabling a global positioning system (GPS) receiver in data communication with a controller of the interruption module, receiving GPS time via the GPS receiver from at least one global positioning system satellite in data communication therewith, synchronizing a real-time clock time of a real-time clock in data communication with the controller to GPS time, disabling the GPS receiver and changing the activation state of the interruption module if a predetermined activation state change time of the interruption module is between the local real-time clock time and the GPS time.