Comparative analysis of pressure loss between Verabar flowmeter and orifice flowmeter

Abstract: Comparative analysis of the pressure loss information of Verabar flowmeters and orifice flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The theoretical basis for the measurement of these two flowmeters is: in a pipeline filled with fluid, a resistance piece (throttle piece) with a flow area smaller than the cross-sectional area of ​​the pipeline is fixedly placed, and the fluid in the pipeline will pass through the throttle piece. Causes a local contraction, at the contraction. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the pressure loss article on the comparative analysis of Verabar flowmeters and orifice flowmeters. The theoretical basis for the measurement of these two flowmeters is: in a pipeline filled with fluid, a resistance piece (throttle piece) with a flow area smaller than the cross-sectional area of ​​the pipeline is fixedly placed, and the fluid in the pipeline will pass through the throttle piece. Causes local contraction, the flow velocity increases at the contraction, and the static pressure decreases. Therefore, a certain pressure difference will be generated before and after the throttle. For a certain shape and size of the throttling piece, a certain pressure measurement position and straight pipe sections before and after, and certain fluid parameters, the relationship between the differential pressure ΔP before and after the throttling piece and the flow rate Q conforms to the Bernoulli equation. This kind of flow meter inevitably creates a maximum pressure loss in the pipeline. Taking the orifice plate as an example, the main reasons for the loss of fluid pressure are the formation of vortices before and after the orifice plate and the friction of the fluid along the way, which makes part of the total mechanical energy of the fluid irreversibly transformed into heat energy and disappears into the fluid. People use throttling parts such as nozzles and venturi tubes to minimize the eddy current area before and after the throttling parts and reduce the pressure loss of the fluid. Verabar flowmeter adopts a bullet-shaped revolutionary design, which not only maintains high precision, high strength and large turnout ratio in flow measurement, but also greatly reduces pipeline pressure loss. Comparison of pressure loss of Verabar and orifice plate: Empirical formula for pressure loss of orifice plate: Whenβ=0.6, PPLo=0.6×△P whenβ=0.7, PPLo=0.5×△P where:β------- Aperture ratio of orifice plate △P------ Differential pressure generated by orifice plate PPLo-----Pressure loss of orifice plate Standard nozzle pressure loss is about: PPLn=0.28×△P~0.33×△P can be obtained through experiments, the pressure loss of Verabar is about: PPLv=0.03×ΔP Because the differential pressure ΔP of Verabar is an order of magnitude smaller than the differential pressure ΔP of the orifice plate, and the ratio of pressure loss is an order of magnitude smaller, the pressure loss of Verabar is very small compared to the pressure loss of the orifice plate. . Next, we will write the expression of pressure loss: the power loss caused by the pressure loss of the throttling member, and its calculation expression is: Hp’=Q×PPL Among them: Q------fluid volume flow PPL----pressure loss caused by the throttling part Assuming that in order to make up for the irrecoverable pressure loss caused by the throttling part, we add a pressure pump afterwards, The efficiency of the pump is assumed to beη. Then: Hp=Q×PPL÷ηAmong them: Q------------ fluid volume flow AM3/SPPL------ pressure loss KPa generated by throttlingη------Dimensionless constant of motor efficiency Hp------------Power loss KW Example: Take steam measurement as an example, suppose a measurement point, the measurement medium is superheated steam, and the pipe diameter isΦ325×13mm, the pressure is 3900KPaG, and the temperature is 450℃. At this temperature and pressure, the vapor density is 12.511Kg/M3, and the differential pressure generated by Verabar is 5.600KPa when the medium flow is 50T/H. Pressure loss generated by Verabar: PPLv=0.03×△P=0.03×5.600=0.168KPa According to the above formula, power loss: Hp=Q×PPL÷ηBecause the density of superheated steam under working conditions is 12.511Kg/M3, the volume flow rate of medium under working conditions (3900KPaG, 450℃) is: volume flow=mass flow/medium density Q=50×1000÷12.511≈3996.5M3/H=1.110M3/S (3900KPaG, 450℃) assuming motor efficiencyη=0.8: The power lost by Verabar is Hp=1.110×0.168÷0.8=0.233 (KW) Assuming that it runs 365 days a year, 24 hours a day, and the electricity cost per kilowatt-hour is 0.8 yuan, then the annual energy consumption of Weiliba is converted into electricity cost: ￥/year=365×twenty four×0.233×0.8≈1633￥/year Assuming that another same measuring point is measured with an orifice plate, the pressure difference of the orifice plate under the same conditions is 30Kpa, and the pressure difference of the orifice plateβ=0.7, the pressure loss generated by the orifice plate: PPLo=0.5×30=15.0KPa The maximum pressure loss reduction percentage of the Weili Barbie orifice plate is: (15.0-0.168)÷15.0×100%=98.88% It is obvious that it is a high-efficiency and energy-saving uniform flow probe. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Comparative Analysis of Pressure Loss of Verabar Flow Meter and Orifice Flow Meter'

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