As an important part of urban infrastructure, underground pipeline carries important functions such as water supply and drainage. However, due to the aging of pipes, improper construction or geological changes, water leakage of underground pipes occurs from time to time. Finding the leakage point in time and accurately is of great significance to ensure the normal operation of the city and save water resources. In this paper, we will introduce in detail the method of finding the leakage point of underground pipeline from the preparatory work of finding the leakage point, common methods of finding the leakage point and post-processing and other aspects.
First, the preparatory work
In the underground pipeline leakage point to find before, need to do a good job of preparation. First of all, to collect the relevant information of the pipeline system, including pipeline drawings, materials, years of use and so on. This information will provide an important reference for the subsequent leakage point finding. Secondly, it is necessary to prepare the necessary detection tools and equipment, such as listening rod, listening leakage meter, pipeline endoscope and so on. At the same time, it is necessary to ensure that the inspectors have the appropriate professional knowledge and operational skills.
Second, common finding methods
1. Listening method
Listening to the sound method is one of the most commonly used method of finding water leakage points. By listening to the sound lever or pipeline leak detector and other tools, in the pipeline above or near to listen to the sound produced by the leak. The size and frequency of the sound is related to the size and location of the leak. By listening carefully and analyzing the sound characteristics, you can initially determine the location of the leak.
2. Gas tracking pipeline leak detector method
The gas tracking method is suitable for finding the leakage point of metal pipeline. First, a tracer gas (such as hydrogen or helium) is injected into the pipeline. Then, a gas detector is used to detect the leak above or near the pipe. When the detector detects the tracer gas, the location of the leak can be determined.
3. Pipeline endoscopy method
For large pipelines or complex piping systems, the pipeline endoscope method can be used to find water leakage points. The endoscope enters the inside of the pipeline through the pipeline interface or reserved port, and transmits the image of the inside of the pipeline to the display screen in real time. Detectors can observe the image, find the pipeline damage, corrosion and other abnormalities, so as to determine the location of the leakage point.
4. Pressure test method
The pressure test method is suitable for the overall detection of piping systems. First, close the inlet and outlet valves of the piping system, and then fill the pipeline with water and pressurize it. During the pressure holding period, observe the pressure change of the piping system. If there is a drop in pressure, it means that there is a leakage problem in the pipeline. At this time, you can initially determine the location and scope of the leakage point by observing the pressure drop speed, range and other parameters.
Third, post-processing
After determining the location of the leakage point, it is necessary to take corresponding repair measures. The choice of repair method should be based on the pipe material, leak size and location and other factors to consider. Common repair methods include local repair, replacement of pipe segments, addition of casing and so on. In the process of repair, it is necessary to ensure that the quality of repair meets the relevant standards and requirements to avoid secondary damage to the surrounding environment and facilities.
In addition, after the repair of the leakage point is completed, it is necessary to review and test the entire pipeline system to ensure that the pipeline system returns to normal operation. At the same time, it is necessary to strengthen the maintenance and repair work of the pipeline to improve the service life and safety of the pipeline.
In conclusion, underground pipeline leakage point finding is a complex and important work. Through reasonable preparation, selection of appropriate finding methods and proper handling of water leakage problems at a later stage, it can ensure the normal operation of urban infrastructure and the safety of residents' water use.
