Research on Bidirectional Flow Metering Based on Ultrasonic Flow Meter

Abstract: The research information of bidirectional flow measurement based on ultrasonic flowmeter is provided by excellent flowmeter and flowmeter manufacturers. Abstract: The field measurement of bidirectional flow measurement by ultrasonic flowmeter was carried out. The measurement results show that the measurement accuracy of ultrasonic flowmeters produced by different manufacturers is different. In practical application, the appropriate flowmeter should be selected according to the different characteristics of reverse measurement accuracy. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of research articles based on ultrasonic flowmeter bidirectional flow measurement. Field measurements were made of ultrasonic flowmeters for bidirectional flow metering. The measurement results show that the measurement accuracy of ultrasonic flowmeters produced by different manufacturers is different. In practical application, the appropriate flowmeter should be selected according to the different characteristics of reverse measurement accuracy. In order to strengthen enterprise management, strengthen assessment, and reduce the gap between production and sales, many domestic water companies have adopted the management mode of district water supply and district metering. Many cities in my country supply water from multiple water sources, and there are two-way flows in the divided pipelines. Therefore, the water delivery volume of the same water delivery pipeline in two directions must be measured separately. With this problem, we have studied the bidirectional flow measurement of ultrasonic flowmeter. 1. Test plan Because the national measurement technology organization has not fully carried out the test work of the two-way flow measurement of the ultrasonic flowmeter, and there is no standard experimental condition in this regard, we have formulated an experimental plan by ourselves. First, the experiment must meet the basic working environment of the ultrasonic flowmeter, that is, the length of the upstream straight pipe section is greater than 10D (diameter) and the length of the downstream straight pipe section is greater than 5D; on the ultrasonic flowmeter. The relative position of the downstream sensor and the host remains unchanged, simulating the working environment in which the ultrasonic flowmeter actually measures the bidirectional flow. According to the above requirements, a deep well of a water source was selected as the experimental object. The measuring pipe section isφ219 seamless carbon steel pipe, the wall thickness is 7mm, the flow rate is about 2.0m/s, the flow fluctuation is small, and the flow is basically constant. The upstream straight pipe section is greater than 50D, and the downstream straight pipe section is greater than 30D. The measuring pipe section is overhead. Flange connection, wide field space, ideal installation and test conditions. The test process adopts the method of online comparison between the relative standard table and the tested table. 2. Test content and results A total of 7 ultrasonic flowmeters participated in the test. A1──FLB type imported portable ultrasonic flowmeter (relative to the standard meter); A2──FLC1 type imported portable ultrasonic flowmeter (inspected meter); A3──FLC2 imported portable ultrasonic flowmeter (inspected meter); B1──TDS-100P improved domestic fixed ultrasonic flowmeter (inspected table); C1──TDS-100P domestic fixed ultrasonic flowmeter (inspected table); C2──TDS-100P domestic fixed ultrasonic flowmeter Flowmeter (inspected table); C3──TDS-100P domestic fixed ultrasonic flowmeter (inspected table). C1, C2, and C3 are the same type of meter, which is the mainstream type of ultrasonic flow meter used by our company. The main purpose of this experiment is to test whether the meter is suitable for bidirectional flow measurement. Test process: ①On-line calibration: firstly measure the relative standard table A1 and the test table online, then perform error correction, and then carry out a repeatability experiment to check the error deviation degree of the corrected test table, and the repeatability experiment results are good. ②Test content: relative to the standard meter A1, the upstream and downstream sensor interfaces of the A2, B1, and C1 meters on the A measurement section are cross-exchanged to simulate reverse flow measurement; the B measurement section rotates 180 degrees to perform actual reverse flow measurement , the rotation process keeps the sensor on the pipe section from shifting. The experimental results are shown in Table 1: The allowable measurement error of the ultrasonic flowmeter is 1.5%. From the above data, it can be seen that the A2, A3, and B1 meters meet the requirements of reverse measurement, while the reverse measurement errors of the C1, C2, and C3 meters exceed the allowable range. . On this basis, we conducted another comparative experiment. Return the A, B pipe sections and all flowmeters to the forward connection. After online calibration, rotate the A measurement section 180 degrees, and test the upstream and downstream sensor interfaces of A3, C2, and C3 on the B measurement section. 3. Test and analysis Two tests were conducted on the flowmeters in the A and B measurement sections to compare the simulated reverse flow measurement and the actual reverse flow measurement online, and the results were consistent, so the interference of human factors such as the installation accuracy of the probe can be excluded. In principle, the errors of the forward and reverse flow measurement of the ultrasonic flowmeter are the same, but the test results show that this is not the case. The forward measurement of the ordinary domestic ultrasonic flowmeter is qualified, and the reverse flow measurement is out of tolerance. The improved domestic meter and the imported meter Bidirectional metrology test errors are all within the allowable range. After analysis and communication with the manufacturer, it is believed that this phenomenon is caused by the consistency of the performance matching of the upstream and downstream sensors of the ultrasonic flowmeter and the electronic devices of the upstream and downstream channels and the differences in device sensitivity. It shows that the performance of ultrasonic flowmeter plays a decisive role in the accuracy of reverse flow metering. 4. Conclusion Ultrasonic flowmeter can be used for bidirectional flow measurement in principle, but in practical application, it is necessary to pay attention to the feature that different phenotypes have different reverse metering accuracy, and select the appropriate phenotype. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Research on Bidirectional Flow Measurement Based on Ultrasonic Flow Meter'

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