The purpose of the environmental investigation of the pipeline network is to fully understand the site conditions and prepare for the construction arrangements and method selection for the next leakage detection work. It includes environmental survey of pipe network, auxiliary equipment survey, water and drainage survey, etc.

Environmental investigation of pipe network: water supply pressure; pipes; sidewalks.

Auxiliary equipment survey: survey the wells, meters, valves, bolts, etc. of the surveyed area, and conduct the first water leakage survey of the above-mentioned appendages.

Drainage survey: A detailed survey of all underground structures involved, such as drainage pipes and cables near the pipe network.

Detailed investigation of leak detection:

In the work area, during the daytime, directly listen to the fire hydrants, valves, water meters and exposed pipes in the area to hear 100% sound waves, which propagate from the leak point to the pipeline structure, and abnormal water leakage is found. After the abnormality is found, a detailed record shall be made. The record content includes: field number, location, nature of the abnormality, abnormality and description, etc.

Audio detection for leak detection:

Operate in a time period when the water consumption is relatively stable and the surrounding environment is relatively quiet.

Investigate the leakage of pipelines buried under the road and mark the ground where water may leak.

Detect the contour of the "meter" at the abnormal place:

The road hearing rate is 100%, the abnormal sound detection rate is 100%; the abnormal point and the surrounding environment are recorded; at the same time, the valve plug listening and environmental investigation are assisted when listening to the road; the leakage point is determined and the location of the leakage point; for the abnormal water leakage found Or area, please organize highly skilled and experienced personnel to make abnormal judgment, eliminate abnormal interference and confirm whether it is abnormal water leakage. If the leak is abnormal, please locate the leak accurately.

Accurately locating leaks is a comprehensive and complex task. It is necessary to comprehensively use various methods such as ground sound intensity detection, pipeline sound intensity detection and pipeline sound intensity detection at close range, and comprehensively analyze the results of valve plug detection, road surface detection, and related detection methods, and then confirm that the leak point is the correct location . Appropriate methods are also needed for landfill leakage detection and integrity detection of impermeable membranes.