Characteristics of flow measurement in the water industry

Flow measurement characteristics of the water supply industry Water plants draw raw water from rivers, lakes or reservoirs, and need to pay the country according to the raw water measurement results. The finished product of the water plant is tap water, and a large number of large-caliber flowmeters are required on the management and distribution network of tap water. These measurement objects have the following characteristics. ①Measurement data is used for trade settlement, and the measurement accuracy is required to be high. According to the regulations of 6^D 17167, the accuracy should reach ±2. 8. ②The flowmeter installed on the main pipeline of raw water and tap water has a large caliber. In order to reduce the pumping cost, the resistance is required to be small. ③The measurement range is required to be high. Household users are used intermittently, even large enterprises and institutions. Water consumption also varies greatly between day and night, between different seasons, in different stages of production, operation, management or service. ④The environment is harsh, and large-diameter pipelines are usually buried underground, so most of the flowmeters are installed in the instrument In the well, the event of rainwater flooding the instrument will occur if there is a slight carelessness, so the flowmeter should have an environmental protection capacity of 1?68. ⑤ The raw water is poor in cleanliness and low in pressure. Silt is easy to accumulate on the pipe wall, so the influence of silt should be considered in the design and selection of instruments, and the cleaning of silt should be considered during engineering design and installation. The current opinions on instrument type selection tend to be consistent. Large-caliber flowmeters used for trade settlement should be selected Electromagnetic flowmeter, which can fully meet the above requirements, small-diameter water flow measurement uses a rotor-type water meter.

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