Comparison of the advantages and disadvantages of vortex flowmeter and orifice flowmeter

Abstract: The advantages and disadvantages of vortex flowmeter and orifice flowmeter are compared with information provided by excellent flowmeter and flowmeter manufacturers. 1. Advantages of vortex flowmeter and orifice flowmeter 1. Advantages (1) The vortex flowmeter has no moving parts, and the measuring element has a simple structure, reliable performance and long service life. (2) The vortex flowmeter has a wide measurement range. The turndown ratio can generally reach 1:10. (3) Vortex flow. For more flowmeter manufacturers to choose models and price quotations, you are welcome to inquire. The following is the details of the article comparing the advantages and disadvantages of vortex flowmeters and orifice flowmeters. 1. Advantages of vortex flowmeter and orifice flowmeter 1. Advantages (1) The vortex flowmeter has no moving parts, and the measuring element has a simple structure, reliable performance and long service life. (2) The vortex flowmeter has a wide measurement range. The turndown ratio can generally reach 1:10. (3) The volume flow of the vortex flowmeter is not affected by thermal parameters such as temperature, pressure, density or viscosity of the measured fluid. Generally, no separate calibration is required. It can measure the flow of liquid, gas or steam. (4) The pressure loss caused by it is small. (5) The accuracy is high, the repeatability is 0.5%, and the maintenance is small. 2. Advantages (1) Standard throttling parts are universal in the world and have been recognized by the International Standards Organization. They can be put into use without real-flow calibration, and are also unique in flowmeters. (2) The structure is easy to replicate, simple, firm, stable and reliable in performance and low in price; (3) The application range is wide, including all single-phase fluids (liquid, gas, steam), some mixed-phase flows, pipe diameters, working There are products in all states (temperature, pressure). (4) The detection piece and the differential pressure display instrument can be produced separately by different manufacturers, so that it can be produced on a professional scale; 2. Disadvantages of vortex flowmeter and orifice flowmeter 1. Disadvantages The volume flow is not affected by the temperature, pressure, density and other thermal parameters of the measured fluid, but the final measurement result of liquid or steam should be mass flow, and for gas, the final measurement result should be standard volume flow. Mass flow or standard volume flow must be converted by fluid density, and fluid density changes caused by changes in fluid working conditions must be considered. (2) Poor adaptability to measuring dirty media. The generating body of the vortex flowmeter is easily dirty or entangled by the medium, changing the geometry size, which has a great impact on the measurement accuracy (3) The main factors that cause flow measurement errors There are: measurement errors caused by uneven flow velocity of pipelines; inability to accurately determine the density of the medium when the fluid working conditions change; the wet saturated steam is assumed to be measured as dry saturated steam. If these errors are not limited or eliminated, the total vortex flowmeter The measurement error will be very large. (4) The anti-vibration performance is poor. External vibration will cause the vortex flowmeter to produce measurement errors and even fail to work properly. The high velocity impact of the channel fluid will cause additional vibrations to the cantilever of the vortex generator body, making the measurement The accuracy is reduced. The influence of large pipe diameter is more obvious. (5) The temperature resistance performance is poor. The vortex flowmeter can generally only measure the fluid flow of the medium below 300 ℃. The pipe section must ensure the first 40D and the last 20D to meet the measurement requirements. 2. Disadvantages (1) The repeatability and accuracy of the measurement are at a medium level in the flowmeter. Due to the intricate influence of many factors, the accuracy is difficult to improve. (2) There is a long straight pipe length requirement, which is generally difficult to meet. Especially for larger pipe diameters, the problem is more prominent; (3 the range is narrow, because the flow coefficient is related to the Reynolds number, the general range is only 3:1 ~ 4:1. (The 4-orifice plate ensures the accuracy with the acute angle of the inner hole, so it is sensitive to corrosion, wear, scaling, and dirt. (5) The pressure loss is large; usually, in order to maintain the normal operation of an orifice flowmeter, the pump needs additional power to overcome the orifice plate. The additional power consumption can be directly determined by the pressure loss and flow calculation. It needs about tens of thousands of degrees of power consumption per year, which is equivalent to tens of thousands of yuan. The table below lists the normal pressure loss of the orifice plate. The calculation result of energy consumption. Among them, the operating days are calculated as 350 days, and the electricity price is calculated at 0.35 yuan/kWh. It can be seen from the power consumption data calculated in the table that the additional operating cost of the orifice plate is extremely high, and the use of elbow flow The operating cost is zero! Long-term use accuracy is difficult to guarantee, and it needs to be removed and inspected once a year. The above is the entire content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. Comparison of advantages and disadvantages of plate flow meter'

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