Underground pipe leak detection commonly used method reminds: security risks need to be solved
The tap water transported by underground pipelines, but how long will it have leakage problems, and will find that the surface of the water leakage does not necessarily have signs, even if the water seeps from the surface, the leakage point may not be the missing point, especially the ground covered with cement, etc. At the stratum, this is all the more true. The methods currently used for the detection of leakage points in underground pipelines are: the listening method, the sound and vibration method, which is what we usually call the pipeline leakage detector/leakage meter. Defects, the following describes several underground pipeline leak detection methods for your reference, I hope to help you.
How to detect the leakage of underground pipes
I. Observation: The soil around the leaking point has a large amount of water and a reduced cohesion. The phenomenon of subsidence in the air often occurs, and leakage can be stopped.
Second, the experimental method: a wide variety, try one or two as follows:
1. Stop the physical magnetization of the water quality. After a certain period of time, stop the water and let it leak. Use the magnetization detection equipment along the line to detect and stop the analysis of the abnormal area.
2, aroused polarization method: This method is usually used for water-poor areas to find water, the key to this method is the scientific treatment and analysis of measurement data.
3, open metal measurement instrument: is now the inspection of the standing weapon, is mainly used to find exposed iron metal objects, but also based on changes in its strength, speculate leak location.
4. The public pipeline detector commonly used by the power supply company: The equipment can show the contrast of the open pipeline, and the leakage part is obviously different from other parts.
Third, in addition, the construction materials should also be consulted. According to the construction records related to the construction drawings, it is certain that there will be relatively large areas with a large amount of leakage. When implementing the above measures, it is certain that the working time and space are consecutive and the maximum amount of funds can be saved.
Underground pipeline leak detection method
1. Regional loading method: refers to the statistics of the flow meter entering this area and the flow meter out of this area in a certain area of ​​the water supply pipe network. The difference must be the no-measurement loss in this area, if there is no other If you measure the consumption, you can know the leakage loss of this area. This will give managers a “very good ideaâ€. The denser the segmentation area of ​​the table is, and the clearer the segmentation is, the more clear is the understanding of the leakage of water in each section. However, it may not be too dense to load a watch. This method can not determine the exact location of the leak, it can not be used as a basis for specific repairs, breaking the road.
Key points: Leakage causes poor metering.
2, listening law, sound vibration method: listening method refers to using some kind of sound tool to listen to leaking sound, according to the size of leaking sound and the characteristics of sound quality to determine the location of leaks, from a simple mechanical hearing loss to all kinds of listening Sound leak detector, this method is essentially called sound vibration method. The current rapid development is the most common and effective method applied at home and abroad, and it is also the method that this manual will focus on. Related leak detectors should also belong to the sound and vibration method.
Key points: Leakage causes vibration and vocal effects.
3. Infrared Method: Infrared Thermography Detects infrared-specific band signals detected by photoelectric technology to detect the thermal radiation of an object. This signal is converted into images and patterns that can be visually recognized by humans. Infrared scanning measurements are made in the area of ​​the pipe network, and leakage occurs underground. The temperature difference between the local area and the surrounding area will be different, and the infrared radiation will be different. The infrared image will reflect this difference. The difference can be found by using this difference. It is noted that due to underground drainage, the stagnant water condition may be different due to other factors. Infrared radiation may also be generated due to non-leakage factors, so the application of this method is also limited.
Key points: Leakage causes local changes in infrared radiation (temperature effects).
4. Related leak detection method: In principle, it is a kind of transplantation technology based on acoustic vibration method, which belongs to sound vibration method. The vibration caused by the leaking point propagates along both sides of the pipeline. Sensors placed at different distances on both sides receive a time difference from the sound wave emitted by the leaking point at a certain time. The time difference is determined by the sound speed and the position of the leaking point of the pipeline. Its outstanding advantages lie in the use of sound transmission in the pipeline, which is measured directly on the official road and fixed by the instrument. It eliminates the human experience factor and can avoid the problem that the tester must hold the tool to the top of the measuring point. Its practical difficulty lies in the conditional constraints. There must be two points directly placed on the sensor to place the pipe, and the state of the pipe is also very clear: including the route, the bend, the diameter of the pipe, the speed of sound propagation in different pipes, and the sound transmission conditions are better. Another factor is that it is expensive and has certain computer application technical requirements for operators. At present, there are a variety of foreign model-related detectors, sold in the domestic market, the domestic large water company also has many applications, but because China's pipe network does not have a dedicated detection point, the conditions are poor, very inconvenient to apply, the effect is not ideal, Can not replace other detection methods to fully complete the detection task.
Key points: The related leak detection method is advanced in technology, but the actual constraints are many and the price is expensive.
Editor's summary: The above is a common method for the detection of underground pipe leaking. Friendly reminder: Safety related issues need to be solved. For leak detection of fire pipes, leakage of tap water in buried pipes, leak detection of pipelines of property companies, leak detection of heating pipes, heating Pipeline leak detection, underground pipeline leak detection, concrete cement leak detection, tap water company pipeline leak location, water supply pipe network leak detection, underground pipe leak detection and other work, many customers are a headache. I hope today's introduction will help you!
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