Turbine flow meter requirements for medium viscosity and inspection items before installation

Abstract: Turbine flow meter requirements for medium viscosity and information on pre-installation inspection items are provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. It is well known that the turbine flowmeter, positive displacement flowmeter and Coriolis mass flowmeter in the flowmeter are three types of flow measuring instruments with high repeatability and high accuracy, and the turbine flowmeter has its own characteristics, such as simple structure and zero processing. Fewer parts and light weight. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the requirements of the turbine flowmeter for the viscosity of the medium and the details of the pre-installation inspection items. It is well known that the turbine flowmeter, positive displacement flowmeter and Coriolis mass flowmeter in the flowmeter are three types of flow measuring instruments with high repeatability and high accuracy, and the turbine flowmeter has its own characteristics, such as simple structure and zero processing. Fewer parts, light weight, easy maintenance, large flow capacity and adaptability to high parameters, etc. Due to the influence of small changes in turbine eccentricity and mechanical frictional resistance torque, the turbine flowmeter will undergo periodic speed changes in the same rotation cycle, which also makes it difficult for the turbine to have a very low speed, because it is very susceptible to disturbance at this time. Stop turning. Influence of viscosity on turbine flowmeter: 1. For low-production wells with high viscosity of produced fluid, a turbine with a more sensitive acquisition system should be used to accurately acquire signals at low speed (less than 0.01r/s). 2. Before entering the linear section of the turbine response, the K value continues to increase, and it increases exponentially with the Reynolds number at the inlet of the flowmeter. 3. As the viscosity increases, the K value of the turbine flowmeter will decrease, and the linearity will also deteriorate. 4. As the viscosity increases, the starting displacement of the turbine flowmeter will decrease, and the minimum speed of response will also decrease. 5. Turbine flowmeters used to measure fluids with different viscosities can only be calibrated once with different Reynolds numbers under high viscosity conditions, and then the relationship between the K value of the turbine flowmeter and the Reynolds number can be approximately obtained, and the turbine flowmeter can be reversed. Response curves for different viscous fluids. Turbine flowmeters will have many small problems when they are installed and used, but it is necessary to pay attention to these details in order to ensure the accurate measurement accuracy of the flowmeter. If you don't pay attention to many details, it will be difficult to find the problem when you use it. Now we summarize the problems that are easy to ignore, hoping to attract everyone's attention. 1. Requirements for piping: The inner diameter of the upstream and downstream piping at the installation point of the turbine flowmeter is the same as the inner diameter of the flowmeter. 2. Requirements for straight pipe sections: The flowmeter must be installed on the pipeline to a certain extent (the inclination of the pipeline is within 50 degrees). When installed, the axis of the flowmeter should be concentric with the axis of the pipeline, and the flow direction should be different. The length of the upstream pipeline of the flowmeter should have an equal diameter straight pipe section of not less than 2D. If the installation site allows the upstream straight pipe section to be 20D and the downstream to be 5D. 3. Requirements for the bypass pipe: In order to ensure that the normal use of the medium is not affected during the maintenance of the liquid turbine flowmeter, a cut-off valve (stop valve) should be installed on the front and rear pipes of the flowmeter, and a bypass pipe should be installed at the same time. The flow control valve should be installed downstream of the flowmeter. When the flowmeter is used, the stop valve installed upstream must be fully opened to prevent the unstable flow of the upstream local fluid. 4. Requirements for the external environment: The flowmeter is best installed indoors. When it must be installed outdoors, sunscreen, rainproof and lightning protection measures must be adopted to avoid affecting the service life. Requirements for impurities in the medium: In order to ensure the service life of the turbine flowmeter, a filter should be installed in front of the straight pipe section of the flowmeter. 5. Requirements in terms of selection: The selection should be within the specified flow range and avoid overspeed operation to ensure ideal accuracy and normal service life. When the turbine flowmeter is running, it is not allowed to open the front and rear covers at will, and change the relevant internal parameters, otherwise it will affect the normal operation of the flowmeter. Be careful to install gaskets to ensure that no protrusions enter the pipe to avoid interfering with normal flow measurements. When the flowmeter is calibrated, the pressure should be collected at the pressure-taking port of the flowmeter. The debris in the pipeline should be cleaned before installing the turbine flowmeter: debris, welding slag, stones, dust, etc. It is recommended that a filter with a 5-micron sieve installed upstream be used to block droplets and sand. When the flowmeter is put into operation, the front valve should be opened slowly first, and then the rear valve should be opened to avoid damage to the turbine due to sudden airflow impact. Refueling should be done according to the notice board, and the number of times of refueling depends on the cleanliness of the temperament, usually 2-3 times a year. Turbine overspeed due to pressure testing, purge piping or exhaust gas, and turbine impeller running in reverse flow can damage the flowmeter. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Requirements of Turbine Flow Meters for Medium Viscosity and Inspection Matters Before Installation'

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