Application of Different Diameter of Electromagnetic Flow Meter in Water Supply Measurement

Abstract: The information on the use of different diameters of electromagnetic flowmeters in water supply measurement is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. In the design of user water connection, we found that when selecting pipe diameter or surface diameter according to user water consumption, there are some situations that need to be comprehensively considered due to the different nature of water use. For example, a new medical device factory in the development zone uses water for production and domestic use. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the use of different diameters of electromagnetic flowmeters in water supply measurement. In the design of user water connection, we found that when selecting pipe diameter or surface diameter according to user water consumption, there are some situations that need to be comprehensively considered due to the different nature of water use. For example, a new medical device factory in the development zone uses water for production, domestic use and firefighting. The maximum water consumption for office and production is 7.62m3/h, the unforeseen water consumption is 1.14m3/h based on 15%, and the supplementary water for air conditioners 5m3/h, the total maximum water consumption is 14.76m3/h. According to the production and domestic water consumption, a group of DN80 water meters should be installed. At this time, the water flow speed in the pipe is 0.83m/s. According to the approval of the fire department, the fire risk of the enterprise workshop is Class C, and indoor and outdoor fire hydrants need to be installed. The design of the design institute is to build a 200m3 fire-fighting pool, and the water storage capacity can meet the indoor fire-fighting water consumption. Outdoor fire water is provided by the outdoor ring pipe network directly supplied by municipal pipes. Water consumption for fire hydrants: outdoor fire hydrant water consumption is 30L/S; According to fire protection requirements and regulations, a group of DN150 water meters should be installed. If a DN150 electromagnetic flowmeter water meter group is installed in the production, living and fire fighting water, according to the principle of the fire protection specification, when the production and domestic water consumption reaches the maximum water consumption, the pipe network fire protection calibration shall be carried out. The water volume and water pressure meet the requirements. Fire-fighting water is only used during fires. When the fire-fighting system is not activated, the main supply of water to enterprises in the pipe is production and domestic water. At this time, the water flow rate in the pipe is 0.22m3/s.<0.3m/s, which cannot meet the requirements of the electromagnetic flowmeter for the flow rate range, that is, it cannot accurately measure the water consumption of the production enterprise, which is unwilling for the water supply enterprise. This kind of case that the user needs to install two sets of measuring instruments due to the mismatch of the water flow velocity in the pipe due to the nature of the water is often encountered in practical work. Our solution is: 1. The diameters of pipes, pipe fittings and valves when connecting municipal water supply are selected according to the parameters after the system is combined, and the sensor diameter is smaller than the diameter of the connecting pipe. Inconsistent, the diameter of the pipe is large and the diameter of the surface is small. When installing and connecting, the sensor is connected with reducers before and after. As a result, the flow rate is partially increased in the electromagnetic flowmeter part, which meets the requirements of the meter for the flow rate range, so that the water supply enterprise can measure the water consumption accurately on the premise of two-in-one, and the enterprise saves the investment cost of a set of metering devices. . For example, the water meter set installed in the above-mentioned medical equipment factory is composed of pipes, valves, and check valves with a diameter of DN150 and an electromagnetic flowmeter of DN100. At this time, the water flow velocity of the sensor part is 0.47m/s.> 0.3m/s. 2. The reducer must meet the taper requirements. The straight pipe section of the inlet and outlet of the electromagnetic flowmeter has length requirements. If the reducer connected to the front and rear of the sensor is to be regarded as a part of the straight pipe section, it should meet the requirements of the product that the cone angle of the tapered or tapered pipe section before and after the sensor is less than 15o. Require. Therefore, in this way, the center cone angle of the reducer must be calculated, such as the population and outlet of the above DN100 electromagnetic flowmeter, DN150 processed according to the 'Water Supply and Drainage Standard Atlas'×100 reducer, its central cone angle is calculated to be 11.74o< 15o. 3. The reducer cannot meet the taper requirements, and the lengthened tapered or tapered tube must be ordered. For example, a large foreign-funded enterprise in the development zone selects a DN600 electromagnetic flowmeter water meter group based on the original design of its water consumption. Consider using an electromagnetic flowmeter with a smaller primary or even secondary pipe diameter, and the water flow velocity is within its allowable range. According to the calculation of the size of the reducer in the standard atlas, the central cone angle of the DN600X400 reducer is 20.42o. DN600×The central cone angle of the 500 reducer is 16.03o, which is greater than 15o, which does not meet the product design requirements. Therefore, it is necessary to order non-standard gradually expanding or reducing pipes, lengthen the length of the reducing part, and reduce the central cone angle to within the taper requirements. In short, when the electromagnetic flowmeter is used for water supply measurement, because its sensor has flow rate requirements, but the flow rate range is wide, the designer can make some flexible changes according to the user's water consumption and the actual situation of the site, which not only saves money It saves the investment of the water meter group and makes the measuring instrument run in a better working state. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Application of Different Diameter of Electromagnetic Flow Meter in Water Supply Measurement'
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