On-line Monitoring of Water Leakage of Underground Pipe Network in Kengzi, Huizhou City, Guangdong Province

Underground pipe network leakage monitoring

In China the average loss of tap water is 15.7%, while there are some places it is as high as 30%. The highest level in developed countries is 6%-8%. Lack of pipeline leakage monitoring has led to the loss of 7 billion cubic meters of tap water each year.That is equivalent to “missing” one Taihu Lake in a year and enough water for a population of 100 million urban residents. Aging underground pipelines, power outages, heating pipes accidents and leaking pipes are a major problem when it comes to tap water. Tap water pipes are not the only problem of major cities. Heavy rains, imperfect drainage system, damaged roads and traffic. There are major roads that are densely covered, these are repeatedly excavated which causes roadblocks. This causes road traffic and city operations become paralyzed.

SaiYing veins independent research and development of direct current method system, and the system successfully applied to the underground pipe network leakage monitoring. Changes in underground moisture content are analyzed by monitoring changes in soil resistivity around the pipeline. In case of pipeline rupture, compared with the original background value, the resistivity of the leakage area will obviously drop and become a high conductance area, thus the leakage point can be judged. Through the product, can be the basic structure of the stratigraphic structure, pipeline distribution, after all, is a very good pipeline leakage monitoring program.

Site construction diagram

Test methods

• Equipment: GD-10 electric law system
• Device: Winner α device, Schlumberger, dipole dipole and gradient device
• Pitch: 0.2-1 meters
• The total number of channels: according to the actual line length set
• Emission voltage: 150 V -300V

Collect data parameters

This experiment need to get the test indicators are as follows:

• Current: Ip
• Voltage: U
• Apparent resistivity: R0
• Pole constant: K
• Natural potential: SP

Construction steps

(1) After the test area is selected, arrange the electrodes along the proper distance between the electrodes just above the pipe.

(2) Select the appropriate area, install the host cabinet, and access the power supply.

(3) Electrode layout is completed, the electrode and the host through a high-density cable connection.

(4) When the equipment is connected, check the grounding status of the electrode. If the grounding resistance is high, the grounding resistance of the electrode should be reduced to a reasonable range by pouring salt water.

(5) After grounding resistance testing is completed, create a new task, select the appropriate device, start collecting section data, and record the test situation.

(6) After the acquisition of the original section data, simulate the situation of pipeline leakage and once again collect the data after the leakage.

(7) After testing, data processing, analysis and comparison results.

Test results

1) Areas have been leaked and resistivity values ​​have changed significantly.

2) Determine the location of the leak, the area of ​​the leak, etc. through the results of the leak at http://www.geomative.com/wp-content/uploads/2017/12/Corss-Hole88.jpg.

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