Views: 47 Author: Site Editor Publish Time: 2022-04-07 Origin: Site
Underground pipeline conveying tap water, but for how long there will be leakage problems, and will find that the leakage occurs when the surface may not have signs, even if the water seeps out from the surface, the seepage point may not be the leak, especially when the ground has a cement and other cover, but even more so, the pipeline leakage point detection is currently used more methods: listening to the sound method, acoustic vibration method, which is commonly known as the leak detector
Different methods have their own merits and defects, the following are several pipeline leak detection methods for your reference.
1, the regional meter method: refers to a certain area in the water supply network, the flow meter into this area and out of this area of the flow meter statistics, the difference must be the unmeasured loss of this area, if there is no other unmeasured consumption, it is possible to know the leakage loss of this area, which will be "in the mind" to the manager. The more dense the metered segmentation area, the clearer the segmentation, the clearer the understanding of each section of the leakage situation. However, it is not possible to install meters too densely. This method can not determine the exact location of the leak, so it can not be used as the basis for specific repair, breaking open the road.
2, listening to the sound method, sound vibration method: listening to the sound method refers to listening to the sound of water leakage with Leak Detector, according to the size and sound quality characteristics of water leakage to determine the location of the leak, from simple mechanical listening to the leak stick to all kinds of listening to the sound leak detector, this method in essence should be called the sound vibration method. It is the most common and effective method applied at home and abroad, and is also the method that this manual will focus on. Related Leak Detector should also belong to the sound vibration method system.
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3, infrared method: infrared thermal imaging detection using photoelectric technology to detect the infrared specific wavelength signal of the thermal radiation of the object, the signal is converted into images and graphics that can be distinguished for human vision, in the pipe network area for infrared scanning measurement, underground leakage occurs, the local area and the surrounding temperature difference, infrared radiation situation will be different, infrared images will reflect this difference using this difference can be found leak, noting that Due to subsurface drainage, water conditions may vary due to other factors. Infrared radiation may also be generated due to non-leakage factors, so the application of this method is also limited.
4, ground-penetrating radar method: the use of electromagnetic waves to scan the state of the underground, from the reflected signal to observe the distribution of the state of underground objects, such as can be done at a glance, of course, both clear and accurate. However, because the underground medium is different from the air, stratified chaos, the degree of penetration of electromagnetic waves is limited, especially around the water pipe has been water, spout down, it is not easy to see, coupled with the current price of such instruments, has not yet reached the stage of universal use.
5、Related leak detection method: in principle, it is a kind of sound vibration method based on
The transplantation technology, belongs to the acoustic vibration method. The vibration caused by the leakage point propagates along the pipe to both sides, and the sensors placed at different distances on both sides receive the sound waves from the leakage point at a certain moment will have a time difference, which is determined by the sound speed of the pipe and the location of the leakage point. Its outstanding advantage is the use of pipe sound transmission is good, measured directly in the official channel and calculated by the instrument fixed point, excluding the human experience factor, but also to avoid the detector must hold the tool to the measurement point above the problem, its practical difficulties lies in the constraints of the conditions, there must be two sensors placed in direct contact with the pipeline point, but also to the state of the pipe is very clear: including alignment, bending, pipe diameter, sound in different pipes The propagation speed and sound transmission conditions should be good. Another factor is that it is expensive and requires a certain amount of computer application technology for the operator. At present there are a variety of foreign models related to the detector, sold in the domestic market, the domestic large water companies also have a number of applications, but because of China's pipeline network and no special detection points, poor conditions, the application is quite inconvenient, the effect is not yet ideal, can not replace other detection means to fully complete the detection task.