How to test underground water pipes?

1, the collection of pipeline information

Collection of the need to detect the pipeline drawing information and water consumption information, the enterprise arranged to be familiar with the location of the pipeline technicians on-site pointed out that the pipeline information.

2, the regional pipe network environment survey

The purpose of the pipe network environment survey is to fully understand the situation on site, for the next step of the leakage detection work of the construction arrangements, method selection and so on to get ready for it, it includes the pipe network environment survey, the investigation of the ancillary equipment, the investigation of water consumption survey and the investigation of the drainage situation, etc..

(1) pipe network environment survey: ① water supply pressure; ② pipeline material; ③ pipeline pavement.

(2) appurtenant equipment survey: investigation of wells, meters, valves, bolts in the region, and the above appurtenances are leakage preliminary investigation.

(3) drainage survey: all underground structures involved in the drainage pipes and cables near the network are investigated in detail.

3, water leakage detailed investigation

In the work area, daytime on the region's fire hydrants, valves, water meters and open pipe 100% direct listening to listen to the sound waves propagated from the leakage point to the pipeline structures, leakage anomalies found. Detailed records are made after the discovery of anomalies, and the records include: field number, location, nature of the anomaly, anomalous conditions and explanations.

4, sound detection

In the investigation area of the pipeline above the water leakage detector according to the "S" route along the pipeline at intervals of 0.5 ~ 1.0m for sound.

Operation is carried out at a time when water consumption is relatively stable and the surrounding environment is relatively quiet.

Investigate the leakage condition of pipes buried under the roadway and mark the ground where water may leak.

a. Do a "meter" profile detection at the anomaly

b. 100% pavement listening rate, 100% sound anomaly detection rate

c. Detailed records of anomalies and the surrounding environment

d.

d. Road listening at the same time should be assisted by valve spigot listening and environmental surveys

5, leakage point confirmation and leakage point positioning

Leakage anomalies have been found or the region, the organization of a high level of technical skill, experienced personnel to carry out the anomaly of the judgement, to exclude the abnormalities of the interference, to confirm that whether or not it is anomaly of the leakage. If it is a water leakage abnormality, then the leakage point will be accurately located.

The accurate positioning of the water leakage point is a comprehensive and complex work. Need to comprehensively utilize the ground sound intensity and audio detection, pipeline sound intensity and pipeline proximity sound intensity audio detection and other methods, comprehensively analyze the valve bolt detection, road detection, related testing and other detection methods, and ultimately confirm the exact location of the leakage point.