Views: 5 Author: pqwt Publish Time: 2022-07-11 Origin: PQWT
Water supply pipe leakage is a problem we often encounter at present, and it is also a complicated process to find. Through years of experience in leak detection, the causes of water leaks in pipes are usually uneven settlement or cracking of pipe joints or rusting of pipe damage and corrosion of welds and several other conditions. Leak detection requires a detailed understanding of the characteristics of the pipeline material and the specific phenomena that occur when water leaks, and by adopting certain technical means and experience, the leak can be found more accurately. In this paper, we will briefly discuss some special phenomena that occur when water leaks, and use a variety of detection methods to accurately find water leaks in pipes.
1、Environmental survey method
The most intuitive way to determine the clues and scope of leaks. According to the water supply network map and the information provided by the relevant personnel, a detailed investigation of the water supply pipeline is conducted. Including the pipeline connection, distribution, material and surrounding media. Leakage points are determined by observing road conditions, snow melting first in winter, lush vegetation above the pipeline, and the long-standing presence of clear water in ditches such as sewer wells.
2、Pressure test comparison method
If the pipe is broken and leaking, if the leak is large, the local pressure of the pipe network will generally decrease, the closer to the leak point the lower the pressure. The use of fire hydrants for pressure measurement comparison, you can quickly lock the leak area.
3. Residual chlorine detection method
According to the national standard for factory water, the residual chlorine content should not be less than 0.3mg/L after 30 minutes of contact with water, and the free residual chlorine content in water at the end of the pipe network should be not less than 0.05mg/L. Using the principle of residual chlorine and o-toluidine reflecting the generation of yellow quinone compounds, by testing the collected water samples and determining whether there is a leak in the water supply pipe network by visual colorimetric method.
4. Use of pipe leak detector
The working principle is that the pressure water pipe leak after the pressure water rushing out from the broken mouth of the pipe, and the sound vibration generated by friction with the pipe wall and other additional vibration caused by the transmission to the pipe above the ground, the instrument is used to detect on the road to find out the leak.
Generally speaking, the basic detection method is, connect the leak detector host, headphones, sensors. Turn on the water leak detector
Switch, wear headphones, place the sensor on the road above the pipeline, place it step by step according to the length of the pace, and listen to it step by step, the closer to the leak, the stronger the signal, the farther away from the leak the weaker the signal, by comparing the signal strength between different points to achieve the purpose of detecting the leak. Therefore, we use the leak detector, a single point in the leak signal is not meaningful, to multi-point repeatedly compared, compared to the sound vibration of the larger place is the leak, of course, we have to consider many other additional factors, such as the direction of the leak breakage mouth, because the pipe is round, if the side of the leak, the larger point may instead be on the side of the road above the pipe, rather than being Pipeline above the road, so the location of the pipeline to know, in addition to the tee, bend, water pressure, burial depth, buried layer, etc. will have an impact on the detection to take these into account.