My water meter in the absence of water, water meters on their own table?
pressure fluctuationSince water is a liquid, the physical properties shown in general are incompressible, but in the water pipe the pressure of the pipeline is higher, and the water will show a certain compressibility. In the tap water pipe, the pressure fluctuation is inevitable, and now we are using the water meter is a mechanical watch, in which water flow generated by the kinetic energy to drive gear, so as to achieve the purpose of water metering. When no water, the water pipe ends are connected in a certain amount of high pressure water are fixed; therefore, when the municipal pipe network pressure rises, the volume of tap water pipe after the table shrinks due to the increase of the pressure, this will have a trace of the water through the water meter, is generated; when the pressure is decreased, the table after the tube in the compressed water with low pressure and expansion, will also have a trace of the water through the water, the difference is this time reversal. As we all know, the general mechanical table in the water is in the drive gear, is turned upside down when the water is in progress under the drive gear reversal, the drag force of water phase is different, although the two head of the same amount of water, but reflected in the reading on the meter is very different. According to statistics, in the absence of air in the pipeline, the resulting water is very small, about 0.5-1m3/ months. Under normal circumstances, the water users will not pay attention to; at the same time, this is also the normal level of measurement results.
GasbagThe reason for this is that the amount of water generated by rotation is greater. Production process of tap water enterprises are open construction, in the production process of water dissolved gas, at the same time in the construction process, the pipeline will be brought into the gas pipeline, if the exhaust valve is unreasonable, gas cannot be ruled out well. Thus, if the house does not use water for a long time, or the pipe design is unreasonable, the highest point or the starting point of the pipe in the house will have an air sac. As we all know, the compressibility of gases is very high. At this time, if there is pressure fluctuation on the pipe network, the space expansion in the pipeline will be very large, so the water meter will rotate more. According to statistics, the resulting water is less than 2-3 m3/ months, and more will produce dozens of cubic meters of water per month. According to the report statistics, the existing users reflect the water meter rotation of the phone 26, after field investigation and treatment found that because of the table after the airbag inside the house and the rotation of 21 households, accounting for 80.8%, after the pipeline leaking 5. Therefore, at present, most of the water meter produces rotation phenomenon, all because the back of the tube in the air bag caused.
Installation method and installation quality3.1, because now the water meter out of households are mostly a unit of households, tables are concentrated in a box, installed on the first floor. Taking into account the freezing cold winter and the meter, with 6 or 12 meter with a diameter of 40mm- 50mm diameter pipe, tables and small spacing and straight sections set aside less water, this will also affect the normal water metering, causing water rotation.3.2, installation quality, pipeline projects are basically buried in the ground or in the wall, is a hidden project. National construction standard pipe provides various pipe pipeline construction installation requirements, construction process, acceptance criteria and matters needing attention, but in the construction site, some managers do not according to the requirements of the code construction, more or less there are some quality problems caused by pipeline.
