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Title: Electromagnetic Flowmeters Of The Large Diameter And Their Dry Graduation
Author: Velt I.D.,Yanzuo Sun,Lianke Li
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: To measure the water flow and /or the heat supply in the large size pipeline electromagnetic flow meter with three inserted electromagnetic local velocity sensors is recommended. The necessity of the design, the principle of operation, the features and the advantages of this flow meter are described in this paper. The flow sensors and this kind of flow meter can be calibrated by simulation method without stopping water flow in the pipeline. The practical application and experiments have shown that the solution for the problem of water flow measurement in the pipeline with large diameter (400 to 4000 mm) is very successful. In this paper the theory and the practice of this flow meter, its dry calibration technique and influence factors are reported and analyzed in detail. More and more accurate and reliable means for water flow measurement in the large size pipes are required to solve problems in environmental protection and to improve large power plants, heat objects and irrigation systems. This task is related to water flow measurement in pipes with diameters from 500 up to 3000 mm and even larger. The volumetric flow rate is ranging from 1,0 up to 50m3/s. The presence of sand, silt and waterweeds in the water is possible. The water velocity does not exceed 1.5-3.5 m/s. The pipelines are located as a rule under ground. The access for installation of flow meters is usually possible in the place most inconvenient for measurements: on the outlet of a pump and downstream of a bend or on the pipeline downstream of a valve which is located underground in a well. In these places the velocity distribution of flow is asymmetric, that essentially complicates conditions of measurements.

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