Comparison of pressure loss between Verabar flowmeter and orifice flowmeter

Abstract: The pressure loss comparison information of Verabar flowmeter and orifice flowmeter is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Verabar flowmeters and orifice flowmeters are differential pressure flowmeters, which are throttling devices. Their measurement principles are all: the fluid that fills the pipeline flows through the throttling device in the pipeline, causing a local contraction near the throttling piece, and the flow velocity increases, upstream and downstream. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the pressure loss comparison article between Verabar flowmeters and orifice flowmeters. Both Verabar flowmeters and orifice flowmeters are differential pressure flowmeters, which are throttling devices. Their measurement principles are all: the fluid filling the pipeline flows through the throttling device in the pipeline, causing local contraction near the throttling part, increasing the flow velocity, and generating a static pressure difference between its upstream and downstream sides. 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 flowmeter as an example, the main reasons for the fluid pressure loss are the formation of vortices before and after the orifice plate and the friction along the fluid, which makes part of the total mechanical energy of the fluid irreversibly transformed into heat energy and disappears in 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. The Verabar flowmeter adopts a revolutionary warhead-shaped design, which not only maintains high precision, high strength and large turnout ratio in flow measurement, but also greatly reduces the pressure loss of the pipeline. Comparison of pressure loss between 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×ΔP where:β------- Aperture ratio of orifice plate △P------ Differential pressure generated by orifice plate PPLo-----pressure loss generated by orifice plate The pressure loss of standard nozzle is about: PPLn=0.28×△P~0.33×△P Through experiments, it can be concluded that the pressure loss of Verabar is about: PPLv=0.03×△P Since the differential pressure △P of Verabar is one order of magnitude smaller than the differential pressure △P 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 . Below we write the expression of the pressure loss: The power loss caused by the pressure loss of the throttling piece, 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 after that, The efficiency of the pump is assumed to beη. Then: Hp=Q×PPL÷η Among them: Q------------ fluid volume flow AM3/S PPL------ pressure loss KPa generated by throttlingη------Dimensionless constant of motor efficiency Hp------- power loss KW Example description: 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÷η Because 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 rate=mass flow rate/medium density Q=50×1000÷12.511≈3996.5M3/H=1.110M3/S(3900KPaG,450℃) Assuming motor efficiencyη=0.8 then: 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 energy consumption of Verabar for one year 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 percentage reduction of the maximum pressure loss of the Verabar flowmeter compared to the orifice plate is: (15.0-0.168)÷15.0×100%=98.88 Combining the comparison of the pressure loss of the above two throttling devices, it is obvious that the Verabar flowmeter is an efficient 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. 'Comparison of pressure loss between Verabar flow meter and orifice flow meter'

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