Judgment of good and bad gas flow meter

Abstract: The judgment information of the gas flow meter is good or bad is provided by the excellent flow meter and flow meter manufacturers. The judgment of whether a gas flow meter is good or bad is not unilaterally considered. First, there can be a part of the judgment from the manufacturer, then the other part is the final accuracy of the instrument. Just catch mice. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the judgment of gas flowmeters. The judgment of whether the gas flow meter is good or bad is not considered from one side. First, there can be a part of the judgment from the manufacturer, then the other part is the final accuracy of the instrument. Simply put, the ancients said that no matter what.“A black cat and a white cat are good cats if they can catch mice”, so the accuracy of the final result is a large proportion of the standard for judging the quality of the instrument, but what I want to say here today is that both from the manufacturer and from the quality are excellent, but the result is not accurate, this time Think carefully about whether it was affected during the test! Error 1: Unreasonable pipeline design It is well known that gas flowmeter is a commonly used gas measuring instrument, mainly for measuring gas, air, nitrogen, acetylene, phosgene, hydrogen, natural gas, nitrogen, liquefied petroleum gas, etc. A common cause of inaccurate results is that unreasonable pipeline design may cause large measurement errors. Two parallel pipelines, when the main network uses gas, the manual valve of the branch network is closed. The gas flow meter measures normally. When the sub-pipeline is also using gas, the manual valve is opened. Since the gas in the main pipeline is divided into part by the sub-pipeline, the air pressure in the main pipeline will drop, so that the pressure before the flow meter is lower than the pressure behind the meter. The flowmeter is reversed, and the flowmeter also accumulates flow, resulting in double metering. To avoid this, a check valve must be installed in front of flow meter 1. Error 2: No distinction between high pressure and low pressure There is a second effect that the measurer uses high pressure to measure low pressure. It is to install the metering chamber on the high-pressure pipeline, and then adjust the pressure through the pressure regulator. The gas user uses gas on the low-pressure pipeline. When the gas consumption of the low-pressure pipeline user is not large, according to the gas state equation, the temperature is similar. When the small flow of the low-pressure pipeline is inversely calculated to the high-pressure pipeline, the flow will be smaller, and even this flow cannot reach the starting flow of the flowmeter. The flow meter does not count. Therefore, it will cause a large measurement error. Error 3: Improper installation The correct installation of the gas flowmeter will help improve the measurement accuracy of the flowmeter and prolong its service life. When the flowmeter is installed on the pipeline, it should be ensured that the threaded holes on the flowmeter body and the threaded holes of the pipeline flange are aligned to ensure the parallelism of the flange, avoid the flowmeter from being subjected to other external forces, and prevent the meter body from being deformed by force, so that the Flowmeter stuck. When opening the flowmeter, the front valve should be opened first, and then the rear valve should be opened slowly, so that the gas flowmeter can be started under pressure, so as to avoid the flowmeter being stuck due to the impact deformation of the flowmeter rotor due to the gas hammer effect. The above are the influences of external factors during measurement, and of course their own influences. For example, when the gas flowmeter is made, due to rough parts, assembly accuracy and wear and other reasons, the accuracy of the flowmeter itself is not high or the accuracy is reduced, which makes the measurement The number of products is inaccurate. Therefore, when selecting a flowmeter, one with higher accuracy should be selected. At present, the accuracy of the working flowmeter required in my country is±0.5%, and periodic verification should be carried out according to the regulations in use. This depends on the responsible attitude of the manufacturer, as well as the keen eye of the buyer! Analysis of factors affecting the measurement accuracy of gas flowmeters: Through the analysis of the on-site measurement results, combined with the traditional laboratory verification experience, the factors affecting the measurement accuracy are summarized as follows: (1) Compared with the laboratory, the on-site verification environment, when on-site verification Due to the large attenuation amplitude of signal propagation, unstable detection, serious signal interference and flow field influence, certain measures need to be taken to minimize the influence of external environmental factors. (2) For small gas supply enterprises, the pressure of the pipeline itself is generally 0.6 to 1.0 MPa. The metal pipeline used in the laboratory standard device has a large attenuation of the speed of sound, which causes the ultrasonic transducer to be clamped on the pipeline and cannot be measured. Fluid signal, which affects the verification result. Therefore, through experiments, it is another problem to be solved for the system to find out a kind of pipe that can replace the metal pipe as the pipe for installing the transducer. (3) The influence of the installation method of the transducer. For on-site verification of low-pressure environments, different pipe materials have a certain impact on the installation method of the transducer. The recommended installation method of the flow totalizer is V type. For the fluid whose flow distribution disorder makes the application condition worse, the reflective installation can provide compensation. Direct type (Z) type installation can obtain stronger transducer signal. Since the system uses plastic pipes, the attenuation of the sound velocity by the pipe material is relatively large, and the Z type installation effect is better.

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