Since the reform and opening up. China’s urban built-up area has grown from 7,438 square kilometers in 1981 to 47,855 square kilometers last year. The urbanization rate reached 53.7% last year, achieving a historic record. Yet, underground infrastructure, failed to keep up with the pace of urban construction. Gas pipeline and heat pipeline accidents occur and the pipeline leakage is serious. Take tap water as an example, China’s average loss rate is 15.7%, while in some places it is as high as 30% or more. But, in developed countries, the highest level is 6% to 8%. China’s annual loss of tap water because of pipeline leakage is more than 7 billion cubic meters. This is equal to the capacity of the Lake Tai and enough to supply a city with a population of 100 million. The problems of urban water logging and road damage is not yet solved for a long time. Due to the imperfect drainage and flood control system in most cities. A heavy downpour would result in urban traffic, communication and power outages. To the extent that it can paralyze the whole city. The most of the damage is on urban roads. A certain number of roads are not only covered by well lids, but also excavated. Data from some domestic cities show that on average the roads in the main urban areas have been excavated about 1,500 times a year over the past five years.
Geomative has researched and developed the direct current electrical system. They applied the system to the pipeline leak detection monitoring. Monitoring the change of soil resistivity surrounding the pipeline. With the use of a leak detection equipment. If there is a pipeline rupture the resistivity will reduce. In this way, the leakage points can be identified. The product can display the strati graphic texture as well as the pipeline distribution, and can be deemed as a good pipeline leakage monitoring.
Urban pipeline monitoring of Long’gang District, Shenzhen
In the pipeline monitoring case of Longgang District, Shenzhen, the pipeline leakage points were successfully discovered. Through the inversion results of ERT resistivity test, the leakage positions and areas were identified as shown in the following figure:
Please click Urban pipeline monitoring case for case details