Differences between Vortex and Orifice Flow Meters

Abstract: The difference information of vortex and orifice flowmeters is provided by excellent flowmeter and flowmeter manufacturers. 1. Comprehensive performance evaluation of vortex flowmeter and orifice flowmeter The orifice flowmeter (orifice for short) is composed of a throttling pressure taking device and a differential pressure transmitter. The pressure guiding pipe needs to have heat tracing for places prone to freezing. Measures, a flow measurement loop static seal point is 2. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the difference article details of vortex and orifice flowmeters. 1. Comprehensive performance evaluation of vortex flowmeter and orifice flowmeter The orifice flowmeter (orifice for short) is composed of a throttle pressure taking device and a differential pressure transmitter. The pressure guiding pipe needs to have heat tracing for places that are easy to freeze. There are about 20 static sealing points in a flow measurement loop. There are the following problems in use: easy to freeze, easy to block, easy to leak, heat tracing can easily cause the aging of the differential pressure transmitter device, and the pressure guiding pipe needs to be isolated in some cases. Due to heat tracing or unstable process operation, the isolation liquid lines of the positive and negative pressure guiding pipes are often unequal, resulting in liquid column difference, which makes the flow indication inaccurate. All of the above will change the flow coefficient and reduce the measurement accuracy. The pipe shortens the pressure guiding pipe and installs the differential pressure transmitter directly on the pipe, but there is still a dead zone of flow. Vortex flowmeter (referred to as vortex street) has only 3 static sealing points, which is not easy to leak, has no dead zone of flow, does not require heat tracing and insulation, and is not affected by fluid weight, temperature, pressure, and viscosity, and the flow coefficient remains unchanged for a long time. . However, when the vortex street is used in a vibration situation, the flow measurement will be inaccurate. At present, anti-vibration vortex street has been launched on the market to overcome the influence of vibration on inaccurate flow measurement. (1) The initial investment of an imported vortex street is about 20,000 yuan (DN15-DN50), and a throttling device includes a differential pressure transmitter, orifice plate and flange, pressure guiding pipe, valve, incubator or protection The box also costs 15,000 yuan. From a long-term point of view, it is still cost-effective to use the vortex street. (2) Installation cost The vortex street installation is simple, just ensure that there is a certain straight pipe section before and after the flowmeter. The straight section of the orifice plate, concentricity, pressure guiding pipe, transmitter, and incubator have certain installation requirements and installation requirements. The cost is several times that of Vortex Street. (3) Maintenance cost The vortex street generally does not fail except for periodic calibration in measurement, while the orifice plate is not. Eliminate leakage, regularly discharge sewage, fill isolation fluid, replace pressure guiding pipes, valves, heat preservation, and cleaning holes Board, etc., there is a certain amount of maintenance. For example, if there are 200 sets of flow orifice measuring circuits (requires thermal insulation and heat tracing), every two years, a certain maintenance fee must be invested in the transformation of the thermal insulation and heating system, which does not include the renewal of the differential pressure transmitter and the renewal of the orifice plate. It is enough to buy a certain number of imported vortex streets. (4) Operating costs 1. The steam consumption cost is such as 200 sets of flow orifice measuring circuits (requires heat tracing), and the steam consumption per hot spot is 0.02t/h. Calculated on an average of 4,300 hours, the steam cost is 40 yuan/ton, the annual steam consumption cost is about 688,000 yuan, and the annual consumption of each circuit is 3,440 yuan. 2. Energy consumption cost The pressure loss of the vortex street is smaller than that of the orifice plate, about 1/15 of that of the orifice plate. Therefore, long-term operation consumes less energy for pumps and fans. The orifice plate is 15 times larger than the vortex street. When used for gas or steam flow measurement, due to the small density, the volume flow of the same pipe diameter is large, the pressure loss is more serious, and the energy consumption is higher. 3. Sewage discharge fee for leakage The discharge fee depends on the number of sewage discharges, generally about 20 times a year. The discharged pollutants and materials pollute the atmospheric environment. If the sewage exceeds the standard, the environmental protection department will also impose a fine on it. (5) The design system accuracy of the orifice plate for long-term operation is 1.5%-2.5%. Since the differential pressure and flow rate are linear relationship, when the flow rate is lower than 30%, the error increases and the gas is too serious. On the other hand, due to The long-term wear of the medium used, the sharp angle becomes blunt, and the flow coefficient changes, which is also an important reason for affecting the accuracy. Due to the special structure of the vortex street, when the accuracy is actually determined (about 0.5%-1% of the measured value), the accuracy is almost unchanged. (6) Interchangeability The same vortex street can measure the flow of gas, liquid and steam. Electronic circuit boards and sensitive components are common to flowmeters with different diameters. Signal output usually has three forms: pulse , analog and digital signals. It can be switched by the switch on the circuit board, and the user can switch to another output signal at any time according to their own needs. Changing the range is also easy, for analog outputs, just change the input pulse frequency. This is not the case with the orifice plate, the aperture is designed for a specific medium, the interchangeability is poor, and it is difficult to change the range, and the orifice plate needs to be recalculated. (7) Range ratio Since the output frequency of the vortex street has a linear relationship with the flow rate, the range ratio of the flow rate can reach 20:1-80:1. For example, the range ratio of Foxboro's vortex flowmeter to measure gas and vapor is 80. : 1, the range ratio of measuring liquid is 40:1,It can meet the requirements of large process flow measurement range, and the accuracy can still be guaranteed. The differential pressure of the differential pressure flowmeter has a nonlinear relationship with the flow rate, and the measurement is not accurate when the flow rate is small, and the range ratio is only 3:1-5:1. If the turndown ratio is expanded, we must try to improve the accuracy of the differential pressure transmitter. (8) Reliability There is now a more reliable vortex street. It has two sets of electronic circuits and two sets of sensitive components installed on one meter body, which are independent of each other and can be used in important flow measurement occasions. Differential pressure flow It is difficult to do this. ]

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