Flow meter selection principle

Abstract: The information on the selection principle of flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. Flowmeter selection refers to considering the safety, accuracy and economy of measurement in a comprehensive manner according to the production requirements, starting from the actual situation of instrument product supply, and determining the method and measuring instrument of the flow sampling device according to the nature and flow of the fluid to be measured. type. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the selection principles of flowmeters. Flowmeter selection refers to considering the safety, accuracy and economy of measurement in a comprehensive manner according to the production requirements, starting from the actual situation of instrument product supply, and determining the method and measuring instrument of the flow sampling device according to the nature and flow of the fluid to be measured. type and specifications. The safety and reliability of flow measurement, first of all, the measurement method is reliable, that is, the sampling device will not cause an accident due to mechanical strength or electrical circuit failure during operation; the second is that the measuring instrument will not affect the safety of the production system regardless of normal production or failure. . For example, for the measurement of high-temperature and high-pressure main steam flow in a power plant, the primary measuring element installed in the pipeline must be firm to ensure that no mechanical damage will occur under high-speed steam erosion. Therefore, standard throttling devices are generally preferred instead of non-standard speed measuring devices such as cantilever beam double horn tubes or insertion flowmeters, as well as target type and turbine flowmeters with low structural strength. For fuel-fired power plants and occasions with flammable gas, explosion-proof instruments should be used. Flowmeter selection refers to considering the safety, accuracy and economy of measurement in a comprehensive manner according to the production requirements, starting from the actual situation of instrument product supply, and determining the method and measuring instrument of the flow sampling device according to the nature and flow of the fluid to be measured. type and specifications. The safety and reliability of flow measurement, first of all, the measurement method is reliable, that is, the sampling device will not cause an accident due to mechanical strength or electrical circuit failure during operation; the second is that the measuring instrument will not affect the safety of the production system regardless of normal production or failure. . For example, for the measurement of high-temperature and high-pressure main steam flow in a power plant, the primary measuring element installed in the pipeline must be firm to ensure that no mechanical damage will occur under high-speed steam erosion. Therefore, standard throttling devices are generally preferred instead of non-standard speed measuring devices such as cantilever beam double horn tubes or insertion flowmeters, as well as target type and turbine flowmeters with low structural strength. For fuel-fired power plants and occasions with flammable gas, explosion-proof instruments should be used. On the basis of ensuring the safe operation of the instrument, we strive to improve the accuracy and energy saving of the instrument. To this end, not only the display instrument that meets the accuracy requirements should be selected, but also a reasonable measurement method should be selected according to the characteristics of the measured medium. The main steam flow measurement of power plants, because it is very important to the safety and economy of the power plant, generally adopts mature standard throttling capacity and differential pressure flow meters. The sewage and fuel oil treated by chemical water treatment belong to dirty flow and low Reynolds respectively. For several viscous flows, standard throttling is not applicable. For dirty flow, non-standard throttling parts such as circular orifice plate are generally used with differential pressure gauge or ultrasonic Doppler flowmeter, while for viscous flow, volumetric flowmeter, target type or wedge flowmeter can be used respectively. The water volume of the turbine population, the circulating water volume of the condenser and the regenerative steam of the regenerative unit are all flow measurement parameters of large pipe diameter (above 400mm). Due to the difficulty in processing and large pressure loss, standard throttling devices are generally not used. According to the characteristics of the medium to be measured and the requirements of measurement accuracy, the flow rate is measured by using plug-in flowmeter, differential pressure gauge with speed measuring element, ultrasonic flowmeter, or non-destructive methods such as marking method and simulation method. In order to ensure the service life and accuracy of the flowmeter, the anti-vibration requirements of the instrument should also be paid attention to when selecting the model. In humid and hot areas, damp and hot meters should be selected. Correctly selecting the specifications of the instrument is also an important part of ensuring the service life and accuracy of the instrument. Special attention should be paid to the selection of static pressure and temperature resistance. The static pressure of the instrument is the pressure resistance degree, which should be slightly larger than the working pressure of the measured medium, generally 1.25 times, to ensure that no leakage or accident occurs. The selection of the measuring range is mainly the selection of the upper limit of the scale of the instrument. If it is too small, it is easy to overload and damage the instrument; if it is too large, it will hinder the accuracy of the measurement. Generally selected as 1.2 to 1.3 times the maximum flow value in actual operation. For long-term contact meters installed on production pipelines, the energy loss caused by the flow measuring element should also be considered. In general, multiple measuring elements with large pressure loss, such as throttling elements, should not be used in the same production pipeline. In short, there is no measurement method or flowmeter that can adapt to various fluids and flow conditions. Different measurement methods and structures require different measurement operations, usage methods and usage conditions. Each type has its own unique advantages and disadvantages. therefore,On the basis of a comprehensive comparison of various measurement methods and instrument characteristics, the best type that is suitable for production requirements and is both safe and reliable, economical and durable should be selected. On the basis of ensuring the safe operation of the instrument, the electromagnetic flowmeter strives to improve the accuracy and energy saving of the instrument. To this end, not only the display instrument that meets the accuracy requirements should be selected, but also a reasonable measurement method should be selected according to the characteristics of the measured medium. The main steam flow measurement of power plants, because it is very important to the safety and economy of the power plant, generally adopts mature standard throttling capacity and differential pressure flow meters. The sewage and fuel oil treated by chemical water treatment belong to dirty flow and low Reynolds respectively. For several viscous flows, standard throttling is not applicable. For dirty flow, non-standard throttling parts such as circular orifice plate are generally used with differential pressure gauge or ultrasonic Doppler flowmeter, while for viscous flow, volumetric flowmeter, target type or wedge flowmeter can be used respectively.

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There are so many factors that businesses have to weigh when producing mass flow meter, and we are not going to pretend to grasp all of them.