Urban pipe network system is an important part of urban drainage system. As the country attaches importance to environmental protection and resource recycling, it is the future trend to build smart water and sponge city. Centralized data visualization and supervision, new sensor technology, Internet of Things technology, the popularization of 5G, etc., make environmental monitoring more convenient and provide the foundation for the construction of online measurement cloud platform. The establishment of sponge city is the technical innovation and practical application of urban water resources reuse. So monitoring water use in cities is an effective way to recycle water resources.
Urban underground pipe network system is generally divided into three basic pipe network systems according to their functions: rainwater pipe network, sewage pipe network and mixed pipe network, and the three pipe network systems all have the phenomenon of unsatisfactory pipe conditions. Three kinds of dissatisfied pipe conditions are different: sewage network many times there will be precipitates, sewage contains suspended matter, industrial sewage may contain a certain corrosive liquid, in the selection of flow monitoring instrument when the protection level and chemical tolerance of the instrument; There are two alternating conditions of full pipe and dissatisfied pipe, which will vary significantly with precipitation intensity and seasonal and regional discharge. Mixed pipes have all the characteristics of both sewage and storm water pipes.
For the condition of dissatisfied tube, the ideal detection method is Doppler flowmeter, which adopts the principle of area flow rate method. Generally, the Doppler probe is used to measure the flow speed, and then the pressure sensor or ultrasonic sensor is used to measure the liquid level. For the kind of sometimes full tube sometimes not full tube condition, because the full tube of the pipeline is pressure, so choose the instrument if there is a pressure compensation mechanism, so as to better ensure the authenticity of the data. Because of the different types of season and sewage, some areas have Meiyu season, the water temperature in the pipeline will also change, in the ultrasonic principle of measurement, the speed of sound will change because of the change of medium temperature, if there is a temperature compensation function in the selection of instruments, will make the data more stable. In view of the special working conditions in the underground pipe network, especially the working conditions of the rainwater pipe, both unsatisfactory and full pipes may appear, and non-contact products are being installed and constructed.
Common manufacturers on the market are generally a Doppler probe + a liquid level measuring device + a host model to measure, in the function of the sensor has its own characteristics. Pipeline measuring instruments are generally more inclined to be integrated, because the diameter of the pipeline is different, the compact size and integration of the instrument is more important —– for the construction side to reduce the difficulty of construction, convenient installation, for the operation and maintenance side is also free from the maintenance of multiple sensors, for the owner to reduce future operation and maintenance expenses and reduce unnecessary construction time. The sensor body with a higher degree of integration is more conducive to the needs of all aspects.
Then the installation of the sensor is generally the installation of the bottom plate or the inner hoop, according to the size of the pipeline and the material of the pipeline to choose the appropriate installation.
Choose the instrument, pls pay attention to the condition of the site, such as output mode, power supply mode, etc.
Post time: Dec-29-2022