Four principles of flowmeter selection (1)

Four principles of flowmeter selection (1) Principle 1 Flowmeter selection refers to starting from the actual situation of instrument product supply in accordance with production requirements, comprehensively considering the safety, accuracy and economy of measurement, and according to the measured fluid The nature and flow conditions determine the method of the flow sampling device and the type and specification of the measuring instrument. The safety and reliability of flow measurement is first of all that the measurement method is reliable, that is, the sampling device will not cause accidents 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 power plants, the primary measuring element installed in the pipeline needs to be firm to ensure that the mechanism will not be damaged under the high-speed steam flow. Therefore, standard throttling devices are generally preferred instead of non-standard speed measuring devices such as cantilever beam double horn tubes or insertion flow meters, as well as target type and turbine flow meters with low structural strength. For oil-fired power plants and places with flammable gases, explosion-proof instruments should be selected. Principle 2 On the basis of ensuring the safe operation of the instruments, strive to improve the accuracy and energy saving of the instruments. For this reason, it is necessary not only to choose a display instrument that meets the accuracy requirements, but also to choose a reasonable measurement method according to the characteristics of the measured medium. The main steam flow measurement of the power plant, because it is very important to the safety and economy of the power plant, generally adopts a mature standard throttling installation and a differential pressure flowmeter. The sewage and fuel oil of chemical water treatment are respectively dirty and low Reynolds flow For viscous flow, standard throttling parts are not applicable. For dirty flow, non-standard throttling parts such as round orifice plate are generally used with differential pressure meter or ultrasonic Doppler flowmeter, while for viscous flow, volumetric, target or wedge flowmeters can be used respectively. The inlet water volume of the turbine, the circulating water volume of the condenser, and the reheated steam of the regenerating unit are all flow measurement parameters with large pipe diameters (above 400mm). Due to the difficulty in manufacturing and large pressure loss, standard throttling devices are generally not used. According to the characteristics of the measured medium and the measurement accuracy requirements, the flow rate is measured by inserting flowmeter, velocity measuring element with differential pressure gauge, ultrasonic flowmeter, or non-destructive methods such as marking method and simulation method.

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