Common leak detection methods for underground buried water pipes

Whether it is a water pipeline or a business water pipeline, when it reaches a certain age, there is a possibility of water leakage. At this time, it is necessary to find a professional leak detection company to use professional leak detection methods to find the leak. So what are some of the common leak detection methods?

In general, mainly including the following: ① acoustic detection method; ② correlation instrument detection method; ③ infrared thermal imaging detection method; ④ gas tracer detection method; ⑤ CCTV endoscopy detection method. Each method is particularly inherent to the operation and use of instruments, the following is a brief description.

① acoustic detection method

Acoustic detection method is also called pipe leak detector this method can be said to be traditional, universal and technical experience required to be a high detection method. Through some kind of sound transmission tool to listen to the sound of water leakage, according to the size and sound quality characteristics of the leak 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 acoustic vibration method.

Its working principle is that after the pressure water pipe leak pressure water from the broken mouth of the pipe rushing out, and the pipe wall friction generated by the sound vibration and caused by other additional vibration to the pipeline above the ground, using the instrument in the road to detect, to find out the leak.

In general, the basic detection method is, connect the pipe leak detector good host, headphones, sensors. Turn on the switch, put on the headset, place the sensor on the road above the pipeline, place it step by step according to the length of the pace, step by step listening, 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 instrument, a single point to listen to the leak signal is not meaningful, to multi-point repeatedly compared, compared with 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, may be larger points instead in the side of the road above the pipe, rather than being the pipe 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.

② Related instrument detection method

The leak detection method from the principle is also a sound vibration method, the vibration caused by the leak point along the pipe to both sides of the propagation, placed on both sides of the different distances of the sensor received at a certain moment the leak point sound waves will have a time difference, the time difference is determined by the speed of sound and leak point location of the pipe.

③ Infrared thermal imaging detection method

Infrared thermal imaging detection method uses photoelectric technology to detect the infrared specific band signal of the thermal radiation of the object, the signal is converted into images and graphics that can be distinguished by human vision, infrared scanning measurement in the area of the pipe network, underground leakage occurs, the local area and the surrounding temperature difference, infrared radiation will be different, infrared images will reflect this difference, the use of this difference can be found leakage point.

④Gas tracer detection method

Hydrogen is an ideal tracer gas, which is lighter in specific gravity (14 times lighter than air) and less viscous than all gases, and can be detected by the instrument by quickly penetrating from the leak to the ground. This helps inspectors to find the location of pipe leaks.

⑤ CCTV endoscopic detection method

This method, compared to the above four methods, the application is still relatively small. Because the limitations of this method is relatively high, generally speaking, through the above-mentioned methods can find the location of water pipeline leakage point.