Factors Affecting the Accuracy of Gas Flow Meters1

There are also many other situations that affect the measurement of gas flowmeters during actual use. There are mainly the following aspects: 1. 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 flow meter measures normally. When the branch pipe network also uses gas, the manual valve is opened. Since the gas in the main pipe is diverted by the branch pipe, the air pressure in the main pipe will drop, so that the pressure in front of the flow meter is lower than the pressure behind the meter. The meter is reversed, and the flow meter also accumulates flow, resulting in double metering. To avoid this situation, a one-way valve must be installed in front of the No. 1 flowmeter. 2. High-pressure metering and low-pressure gas consumption. It is to install the metering chamber on the high-pressure pipeline, and then adjust the pressure through the pressure regulator, and the gas user uses gas on the low-pressure pipeline. When the gas consumption of the low-pressure pipeline is not large, according to the gas state equation, the temperature is similar When the small flow rate of the low-pressure pipeline is calculated back to the flow rate of the high-pressure pipeline, the flow rate will be even smaller, and even this flow rate cannot reach the initial flow rate of the flowmeter. The flow meter does not count. So it will cause a large measurement error. 3. The correct installation method 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 hole on the flowmeter body is aligned with the screw hole of the pipe flange 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. The flow meter is stuck. When opening the flowmeter, the front valve should be opened first, and then the rear valve should be opened slowly, so that the flowmeter can be started under pressure, so as to avoid the flowmeter rotor being impacted and deformed by the gas due to the air hammer effect, causing the flowmeter to be stuck.

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