Judging the quality of the gas flowmeter is considered from many angles and aspects

Judging the quality of gas flow meters is considered from many angles and aspects. The judgment of whether the gas flowmeter is good or bad can be judged partly by the manufacturer, but the other part is the accuracy of the final result. Simply put, the ancients said no matter“A black cat and a white cat can catch mice, they are good cats”, then the accuracy of the result is that the standard for judging whether the instrument is good or bad accounts for a large proportion. However, what I want to say here today is that the manufacturer and quality are good, but the results are not accurate. At this time, we must think about whether it is good or not. Mistake 1: The pipeline design is unreasonable. Gas flowmeter is a commonly used gas measuring instrument, mainly measuring gas, air, nitrogen, acetylene, phosgene, hydrogen, natural gas, nitrogen and liquefied petroleum gas. A common reason for affecting the results is that unreasonable piping design may lead to large measurement errors. Two parallel pipelines, when the main network uses gas, the branch network manual valve is closed. The measurement of the gas flow meter is normal. When the branch network is also using gas, the manual valve is opened. Since the gas in the main pipeline is diverted by the branch pipe, the air pressure in the main pipeline will drop, making the pressure before the gauge less than the pressure behind the gauge. The flow meter reverses and accumulates flow, causing double metering. In order to avoid this situation, a check valve must be installed before the No. 1 flowmeter. Mistake 2: There is no distinction between high pressure and low pressure. There is also a second effect, that is, the measuring device will measure high-pressure and low-pressure gases. That is to install a metering chamber on the high-pressure pipeline, and then adjust the pressure through a pressure regulator, so that the gas user can use the gas on the low-pressure pipeline. When the gas consumption of the gas users in the low-pressure pipeline is not large, according to the gas state equation, when the temperature is similar, the small flow rate of the low-pressure pipeline is calculated back to the flow rate of the high-pressure pipeline will be smaller, and even this flow rate cannot reach the initial value of the flowmeter. flow. Flow meters don't count. So it will cause a large measurement error. Mistake 3: Improper installation. The correct installation of the gas flowmeter helps to improve the measurement accuracy and prolong the service life of the flowmeter. When the flowmeter is installed on the pipeline, it should be ensured that the threaded hole on the meter body is aligned with the threaded hole of the pipe flange to ensure the parallelism of the flange, prevent the flowmeter from being subjected to other external forces, and prevent the flowmeter from being deformed by force. Stuck. To open the flowmeter, the front valve should be opened first, and then the rear valve should be slowly opened to make the gas flowmeter start under pressure, so as to avoid the gas impacting and deforming the flowmeter rotor due to the air hammer effect, causing the flowmeter to be stuck. These are the influences of external factors during the measurement, and of course there are also their own influences. For example, during the manufacturing process of a gas flowmeter, due to rough parts, assembly precision, wear and other reasons, the accuracy of the flowmeter itself is not high or reduced, making the quantity of the measured product inaccurate. Therefore, a flowmeter with higher accuracy should be selected. At present, my country requires the accuracy of the working flow meter to be 0.5%, and it should be regularly verified according to the regulations in use.

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