How to choose the right turbine flow meter and installation method

Abstract: The information on how to correctly select the turbine flowmeter and installation method is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Turbine flowmeter is a kind of speed meter, it has high precision, good repeatability, no zero drift, high turndown ratio, simple structure, few moving parts, high pressure resistance, wide measurement range, small volume, light weight and small pressure loss , easy maintenance and so on. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the article details on how to correctly select turbine flowmeters and installation methods. Turbine flowmeter is a kind of speed meter, it has high precision, good repeatability, no zero drift, high turndown ratio, simple structure, few moving parts, high pressure resistance, wide measurement range, small volume, light weight and small pressure loss , easy maintenance and other advantages, the turbine flowmeter has high-quality bearings, specially designed guide vanes, so it greatly reduces wear, is not sensitive to peaks, and can give reliable measurement variables even under harsh conditions. It has a wide range of use value in petroleum, chemical, metallurgy, food, biochemistry, urban gas pipeline network and other industries. To choose a turbine flowmeter that suits you, you need to consider the following five aspects when selecting a model. 1. According to the requirements of the measurement purpose: it is required to select the instantaneous flow or cumulative flow (cumulative flow), the unit of flow display, measurement accuracy, repeatability, linearity temperature, flow range and range, measurement temperature, pressure loss, temperature and pressure compensation, output signal characteristics and response time, etc. Different measurement objects have their own measurement purposes, and have different focuses on instrument performance. 2. Requirements for the properties of the measuring medium: chemical corrosion and scaling, and the chemical properties of the fluid sometimes become the determining factor for the selection of measuring methods and instruments. Certain fluids can cause corrosion of instrument contact parts, surface scaling or precipitation of crystalline metal surfaces to produce electrolytic chemistry. 3. Requirements for measuring the phase of the medium: according to whether the measuring medium is a single phase change medium or a multi-phase and multi-component flow, it should be treated with caution. Turbine flowmeter measures single clean medium, electromagnetic flowmeter can measure solid-liquid two-phase mixed medium, etc. 4. Compression system and other parameter requirements: To measure the gas, it is necessary to know the compression coefficient value in order to obtain the fluid density in the working state. For fluids with fixed composition, the density is calculated by pressure, temperature and compressibility; for fluids with variable composition and working in the near (or in) supercritical region, online density measurement should be considered. 5. Measurement accuracy requirements: It is necessary to clarify the overall measurement accuracy requirements and whether it is used at a specific flow rate or has significant changes due to temperature and pressure changes within a certain volume range. The value is generally low, and various The difference between the gases is small. The commonly used accuracy grades of intelligent liquid turbine flowmeters are 1.0 and 0.5. This accuracy grade is higher than that of general rotor flowmeters, and it is a good choice for customers with higher accuracy requirements. The use of liquid turbine flowmeter and the requirements for the installation environment: the ideal measurement environment is a strong guarantee for the normal operation of the flowmeter, but in many cases, the complex environment of the use site will also affect the accurate measurement of the turbine flowmeter. The flowmeter is based on different measurement principles. It is divided into velocity type flowmeter and positive displacement flowmeter. The measurement methods of different principles have very different installation requirements. The velocity is that the flowmeter generally requires a long enough straight pipe section to achieve the purpose of full pipe and stable flow rate. However, general positive displacement flowmeters, such as oval gear flowmeters, do not have too many requirements for straight pipe sections. The instrument instruction manual does not describe the instrument in detail, and the installation location and flow direction, maintenance space, installation direction and other requirements and their effects should be considered. 1. Safety Safety is the first factor to be considered in the selection of flowmeters, such as the requirements of explosion-proof performance, used in explosive hazardous environments, and selected according to atmosphere adaptability, classification and grouping of explosive mixtures, types of protective electrical equipment, and other safety rules or standards. meter. 2. Compressive strength: It is required that the casing of the turbine flowmeter should be able to withstand the compressive strength test for 5 minutes under the test pressure of 1.5 times the maximum working pressure without damage or air leakage. 3. Ambient temperature The electronic components of the turbine flowmeter instrument and the flow detection part of some instruments will be affected by changes in ambient temperature. 4. Ambient humidity High humidity will accelerate atmospheric corrosion and electrolytic corrosion and reduce electrical insulation, and low humidity will easily induce static electricity. Rapid changes in the ambient temperature or medium temperature of the turbine flowmeter cause humidity problems. The user should anticipate the range of possible variations and verify that they will not cause problems in the operation of the selected instrument. 5. Electrical interference Power cables, motors and electrical switches will all generate electromagnetic interference,become a source of error. Therefore, care should be taken to prevent or reasonably effectively ground or shield interference sources. 6. Pipeline vibration Some flow instruments (such as vortex flowmeters, Coriolis mass flowmeters) are susceptible to vibration interference, and the pipeline behind the label should be considered for reliable support design. Although the pulsation buffer can eliminate the influence of the pump and compressor, it should be installed away from vibration or pulsation. 7. Conditions of upstream and downstream pipe sections and requirements of straight pipe sections: Most velocity flow meters, including turbine flow meters, are more or less affected by the flow conditions at the inlet, and a good flow velocity distribution must be ensured. The piping arrangement introduces different types of flow disturbances, the most common being flow profile distortion and vortices

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