Influence of Viscosity on Measurement Accuracy of Turbine Flow Meter and How to Improve Turbine Accuracy

Abstract: The influence of viscosity on the measurement accuracy of turbine flowmeters and information on how to improve the accuracy of turbines are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. It is well known that turbine flowmeters, positive displacement flowmeters and Coriolis mass flowmeters in flowmeters are three types of products with relatively high repeatability and accuracy, while turbine flowmeters have their own characteristics, such as simple structure, processing parts Small and light weight. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the impact of viscosity on the measurement accuracy of turbine flowmeters and how to improve the accuracy of turbines. It is well known that turbine flowmeters, positive displacement flowmeters and Coriolis mass flowmeters in flowmeters are three types of products with relatively high repeatability and accuracy, while turbine flowmeters have their own characteristics, such as simple structure, processing parts Less, light weight, easy maintenance, large flow capacity and can adapt to high parameters. 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. The influence of the viscosity of the measured medium on the turbine flowmeter: 1. For low-production wells with high viscosity of the produced fluid, a turbine with a more sensitive acquisition system should be used to accurately collect 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. What are the factors that affect the measurement accuracy of turbine flowmeters? 1. There are generally some impurities in the medium, which will wear the bearings and shafts, so that the gap between the two will increase, the dynamic balance of the moving parts will be destroyed, the speed will drop, or the dirt will enter the gap, which will increase the movement resistance. , the speed drops. All of these reasons cause the display value of the instrument to decrease and negative errors to appear, which is unfavorable to the fluid supplier. 2. The fibrous or viscous impurities in the fluid are attached to the rotating part of the flowmeter, which increases the rotating resistance, reduces the indication value of the instrument, and causes negative errors, which is unfavorable to the fluid supplier. 3. Changes in fluid temperature and pressure may cause the liquid in the pipeline to escape the air contained in it, or because the pressure in the pipeline is lower than the saturated vapor pressure of the fluid, part of the liquid may turn into steam, or the negative pressure of the medium may cause the external air. The gas is sucked into the pipeline, and these gases flow with the liquid to be measured, causing the indication value of the instrument to increase, resulting in a positive error, which is unfavorable to the demand side of the fluid. 4. The working environment is relatively bad, for example, electromagnetic field interference, dust, high temperature, vibration, humidity, etc., may cause the malfunction or failure of the turbine flow sensor, which directly causes the indication error of the turbine flowmeter. The error may be positive or negative. value, which may not be obvious, or it may be completely ineffective. For the above phenomenon, when it is more serious, problems can be found from the comparison of the working status of the process, and it is easy to take corresponding measures. However, in the early stages of the problem, the problem cannot be detected without taking special measures. The maintenance of the turbine flowmeter should pay attention to the following points: 1. When using, the measured medium should be kept clean and free of impurities such as fibers and particles. 2. When the turbine flow sensor starts to use, the sensor should be filled with medium slowly, and then the outlet valve should be opened (the valve should be installed at the back end of the flowmeter). It is strictly forbidden for the sensor to be impacted by high-speed fluid when there is no medium. 3. The maintenance period of the turbine flow sensor is generally half a year. When overhauling and cleaning, be careful not to damage the parts in the measuring chamber, especially the impeller. When assembling, please pay attention to the positional relationship between the guide and the impeller. 4. When the turbine flow sensor is not in use, the internal medium should be cleaned, and after drying, a protective cover should be added at both ends of the sensor to prevent dust from entering, and then stored in a dry place. 5. The filter should be cleaned regularly, and the internal medium should be cleaned when not in use. Like the sensor, add a dust cover and store it in a dry place. 6. Before the sensor is installed, blow the impeller by mouth or by hand to make it rotate quickly to observe whether there is a display, and then install the sensor when there is a display. If there is no display, check the relevant parts and troubleshoot. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'The Influence of Viscosity on the Measurement Accuracy of Turbine Flow Meter and How to Improve the Accuracy of Turbine'

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