Embedded Conductors for Plastic Pipe Leakage Detection
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Solution Overview
Problem
Existing methods for monitoring leaks in buried plastic pipes, particularly those laid without trenches, are not suitable for standardized pipes and require significant effort, lacking reliability in detecting damage and leaks.
Innovation Solution
A method involving a permanent DC voltage applied to one helically routed electrical conductor and grounding another parallel conductor, allowing for measurement of current flow to detect leaks or damage, with optional use of electromagnetic alternating fields for localization from the earth's surface, and continuous measurement of insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional test systems with end-connected conductors are used, then leak detection is possible, but the device complexity and effort required are significant
Solution Approach 1:
The patent combines the testing function directly into the pipe wall by embedding conductors during manufacturing, merging the structural and testing functions into a single integrated component. This eliminates separate testing equipment and reduces overall system complexity while maintaining reliable leak detection capability.
Solution Approach 2:
The conductors are embedded in the pipe wall during the manufacturing process before the pipe is put into service. This preliminary action ensures the testing capability is already in place, eliminating the need for complex installation of testing equipment later and reducing the effort required for subsequent leak detection.
2Measurement precision
If probe-based electromagnetic wave methods are used, then damage location is possible, but the ease of operation and continuous monitoring capability are limited
Solution Approach 1:
The embedded conductors enable the pipe to monitor itself continuously without requiring external probes or manual intervention. The system automatically detects and locates leaks through the conductors already integrated in the pipe wall, making operation simple and continuous monitoring feasible.
Solution Approach 2:
The patent replaces the mechanical probe-based electromagnetic wave method with an electrical field-based detection system using embedded conductors. This substitution enables continuous monitoring and simplifies operation while maintaining the ability to precisely locate damage through electrical measurements.
3Reliability
If foam layers are added for conductor insulation, then electrical insulation is improved, but the pipe becomes unsuitable for outdoor burial applications
Solution Approach 1:
The patent changes the insulation parameter from foam material to a thin plastic layer coating, which provides sufficient electrical insulation for outdoor burial applications. This parameter change maintains the necessary insulation properties while adapting the pipe for versatile outdoor use without foam layers.
Solution Approach 2:
The patent applies a thin plastic insulating layer locally at specific points where conductors are most vulnerable to moisture ingress, rather than using foam layers throughout the entire pipe structure. This localized approach provides necessary insulation while maintaining suitability for outdoor burial applications.
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 reliable and efficient detection of leaks and damage in buried plastic pipes with minimal effort, allowing for early detection and repair, even if only the outer layer is damaged, thereby preserving the inner pipe's integrity.
Implementation Method 1
a permanent DC voltage is applied to a first electrical conductor, a second conductor that is helically routed approximately parallel to the first conductor is grounded, and that if a medium flowing in the plastic pipeline escapes and/or if the outer layer of the pipeline is damaged, a current flow occurring in the two conductors is measured
Implementation Method 2
the use of an electromagnetic alternating field in order to enable a leak point that has occurred to be localized from the earth's surface
Data Source
Figure 1~2
AI summary
The method involves connecting a permanent direct current voltage to an electric conductor (4). Another conductor (5) guided helically parallel to the former conductor is earthed and a current flow is measured or displayed. The current flow is occurred with discharge of a medium flowing in the plastic pipe lines or with breakdown of the outer piper of the pipe line between both the conductors. An independent claim is also included for an arrangement for monitoring leakages in underground plastic pipes, particularly in plastic pipes passing trenchless in the ground.