Can vortex flowmeters replace orifice flowmeters?

Abstract: Can vortex flowmeters replace orifice flowmeters? The information is provided to you by the excellent manufacturers of flowmeters and flowmeters. Recently, many customers have often asked us whether the vortex flowmeter can replace the orifice flowmeter? Today we will explain to you whether these two products can be substituted. 1. About vortex flowmeter products The basic structure of vortex flowmeter products is given by. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is whether the vortex flowmeter can replace the orifice flowmeter? Article details. Recently, many customers have often asked us whether the vortex flowmeter can replace the orifice flowmeter? Today we will explain to you whether these two products can be replaced. 1. About the vortex flowmeter product The basic structure of the vortex flowmeter is composed of a vortex generator, a detection element, and a signal processing and amplifying circuit. At present, the research on the vortex generator has reached a fairly complete level. The body is a shaped body, and the detection elements include thermistors, strain gauges, piezoelectric crystals, differential capacitors, and ultrasonic waves. Many signal processing parts have been microcomputerized. The vortex flowmeter has the advantages of easy installation (can be installed directly on the pipeline), small size, strong interchangeability, and high long-term running accuracy, and can be used for most liquid, gas and vapor measurements. At present, the sales of vortex flowmeters in the world market are increasing by about 30% every year. 2. About orifice plate flowmeter product Orifice plate flowmeter is a high-range ratio difference composed of standard orifice plate and multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter and pressure transmitter). The pressure flow device can measure the flow of gas, steam, liquid and natural gas. Due to the advantages of simple structure, low cost and reliability, the orifice throttling device is suitable for almost all medium measurement, and the matching differential pressure transmitter The rapid development makes up for its own shortcomings. It is widely used in process control and measurement in petroleum, chemical, metallurgy, electric power, heating, water supply and other fields. At present, the technical development level of the orifice flowmeter is still based on the established empirical formula. In 1980, the International Organization for Standardization merged the two standards of R541 and R781 into the standard ISO5167 (1980). 3. Comprehensive performance evaluation of the two products The vortex flowmeter (referred to as vortex street) has only 3 static sealing points, is not easy to leak, has no dead zone of flow, does not need heat tracing and insulation, and is not affected by fluid gravity, temperature, pressure, and viscosity. and other influences, the flow coefficient remains unchanged for a long time. 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 measures 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, in some cases, the pressure guiding pipe needs to be added with isolation fluid, due to heat tracing or unstable process operation, positive and negative The liquid line of the isolation liquid in the impulse pipe is often unequal, resulting in a 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. 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.

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