In-pipe Pressure Gradient Leak Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current leak detection methods in water distribution networks are limited by high costs, time consumption, inaccuracy, noise interference, and material and location dependencies, particularly failing to effectively detect leaks in plastic pipes and deep or hard-to-access locations.
Innovation Solution
A leak detection system with sensing elements placed near the inner pipe wall to detect pressure gradients, using diaphragms, capacitive designs, and piezoelectric elements to respond to pressure changes, allowing for independent detection of leaks regardless of pipe material, depth, or environmental factors, and equipped with a moving body for navigation within the pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic leak noise correlators are used, then leak detection is effective in metal pipes, but the method becomes doubtful with plastic pipes due to high signal attenuation
Solution Approach 1:
The patent replaces acoustic detection methods with a pressure gradient detection system. Instead of using acoustic sensors that rely on sound wave propagation through the pipe wall and surrounding medium, the invention uses pressure sensors that directly measure pressure differences across the pipe wall at the leak location. This mechanical-to-pressure measurement substitution eliminates the signal attenuation problems associated with acoustic methods in plastic pipes.
Solution Approach 2:
The patent introduces pressure sensors as intermediary devices that are positioned close to the leak source within the pipe. These sensors act as intermediaries between the leak event and the detection system, directly measuring the pressure gradient caused by the leak without relying on acoustic wave propagation through the pipe material and surrounding environment.
2Adaptability or versatility
If conventional acoustic leak detection devices are used, then leak detection can be performed, but the method depends on pipe material, pipe depth, soil type, background noise, and other environmental effects
Solution Approach 1:
The patent replaces acoustic detection that is highly sensitive to environmental factors with pressure gradient detection. Pressure sensors directly measure the pressure difference across the pipe wall at the leak location, which is primarily determined by the leak itself rather than external environmental conditions such as soil type, pipe depth, or background noise.
Solution Approach 2:
The patent employs pressure sensors positioned very close to the leak location within the pipe, creating a localized measurement zone. This local quality approach ensures that the measurement is dominated by the leak-induced pressure gradient rather than distant environmental factors, thereby improving adaptability across different installation conditions.
3Area of stationary object
If leak detection methods are applied to deep or hard-to-access pipe locations, then comprehensive network coverage is achieved, but detection accuracy decreases due to distance from leak source
Solution Approach 1:
The patent employs a moving sensor platform that can dynamically navigate to and from leak locations within the pipe network. This dynamic approach allows the system to achieve comprehensive network coverage while maintaining high measurement precision by positioning the pressure sensors close to the leak source regardless of the pipe's depth or accessibility, thereby resolving the contradiction between coverage area and detection accuracy.
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 system effectively localizes leaks by capturing clear signals close to the leak, reducing noise interference and improving accuracy, enabling efficient detection and sizing of leaks in various pipe materials and environments.
Implementation Method 1
a pressure gradient at a leak in the pipe will cause the sensing element to respond to the pressure gradient
Implementation Method 2
a diaphragm including at least one piezoelectric element on its surface which deforms to generate a signal in the presence of a pressure gradient resulting from a leak
Implementation Method 3
an elastic capacitor plate is in operative relation to a fixed capacitor plate. Deformation of the elastic capacitor plate changes the capacitance to indicate a leak
Data Source
AI summary
Leak detection system. The system includes a structure sized to fit within a pipe for supporting at least one sensing element near an inside wall of the pipe, whereby a pressure gradient at a leak in the pipe will cause the sensing element to respond. Structure is provided for detecting movement or deformation of the sensing element, the movement or deformation indicating the presence of a leak. In a preferred embodiment, the structure includes two spaced-apart rings for supporting the at least one sensing element. The sensing element is a diaphragm in a preferred embodiment. In this embodiment, the sensing element is supported for movement with respect to the ring structure which includes sensing circuitry for detecting the movement to indicate a leak. Other embodiments employ different sensing elements that respond to pressure gradients near leaks.