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Interferences encountered by leak detectors
- 2020-04-17-

The reasons for the interference include: the pipeline is partially blocked, and the diameter and direction of the pipeline suddenly change; the pump and water meter installed in the pipeline; and the leak detector should be able to distinguish carefully during the daily leak detection process. Determine the cause of the noise to determine whether it is the sound of a leak in the pipe. The leak detector is used for testing.

Leakage noise is mainly transmitted through the pipe wall and the soil around the pipe. "Hard" materials have good noise performance, while "soft" materials have poor performance. Therefore, the noise distance in the metal pipe is longer than the noise distance in the metal pipe. The propagation distance in cement pipes is much larger, and the propagation distance in cement pipes is greater than that in plastic pipes. The propagation distance of a small diameter pipe is greater than that of a large diameter pipe. The soil is usually worse than the pipe itself. Soft sand is worse than compacted soil. When listening to the sound, the leak detector should use a listener to determine the location of the leak based on the material of the pipe, the size of the pipe diameter, the depth and the type of soil.

However, environmental factors are the main source of interference in leak detection. Therefore, our leak detectors often need to use night interference noise to monitor leaks. In the work area, the leaking of the pipeline is the leak meter. During the day, you can directly listen to the fire hydrants, valves, water meters and exposed pipelines in the area to listen to the sound waves transmitted from the leak point to the pipeline structure, and to discover the leakage abnormality. After the abnormality is found, a detailed record shall be made, including: field number, location, nature of the abnormality, abnormal state and description.

In the process of leak detection, the choice of instrument is also very important. The sound insulation rod is suitable for shallow buried pipelines and can also be connected to the pipeline. The sound bar is real, there is no electronic noise from electronic musical instruments, and the positioning is accurate. The pipeline is buried within 2 meters. At the same time, the direction of the pipeline is clearly taught, and a leak detector can be used. The leak detector has high sensitivity, but it is greatly affected by the environment. It can be used when the pipeline is deeply buried or the pipeline cannot pass people to reach a higher position. The relevant instrument can be accurately positioned, but it is also greatly affected by the environment.

In the daily work of our leak detectors, the leak detector will not be used blindly. Traditional leak detection methods cannot be ignored. An experienced leak detector told me that 80% of leaks will enter the sewer. For leaks invented in the same way or in the same field, employees with high organizational skills and rich experience will learn to make abnormal judgments, eliminate abnormal annoyances and confirm whether they are abnormal leaks. If the leakage is abnormal, the location of the leakage point must be interrupted. Accurately locating leaks is a comprehensive and complex task. It is necessary to comprehensively apply various methods such as ground sound intensity and audio detection, pipeline sound intensity and pipeline close-range sound intensity audio detection, and comprehensively analyze the results of various methods, such as valve plug detection, road detection and sound pressure detection. Coherent detection to confirm the correct location of the leak point.