There are also many other conditions that affect the metering of the gas flow meter during actual use . There are mainly the following aspects: Â Â 1 , high pressure metering low pressure gas. It is to install the measuring chamber on the high pressure pipeline, then adjust the pressure through the pressure regulator, and use the gas household to use the gas on the low pressure pipeline. When the gas consumption of the low pressure pipeline is small, according to the equation of state of the gas, the temperature is similar. At that time, the low flow rate of the low pressure pipeline will be reduced to the high pressure pipeline flow, and even this flow rate will not reach the flow rate of the flow meter. The flow meter does not count. So it will cause a larger measurement error. Â Â 2. Unreasonable piping design may cause a large measurement error of the gas flow meter . Two parallel pipes, when in charge of the network gas, the manual valves of the branch network are closed. Flowmeter measurement is normal, when the branch pipe network also uses gas, the manual valve opens, because the gas in the main pipe is diverted by the branch pipe, the pressure in the main pipe will drop, making the pressure in front of the meter less than the pressure in the table, the flow Reversing the meter, the flowmeter also accumulates flow, resulting in double metering. To avoid this , a check valve must be installed in front of Flowmeter # 1 . Â Â 3. The correct installation method will help improve the accuracy of measurement and prolong the service life of gas flow meters . When the flowmeter is installed on the pipeline, the screw holes on the flowmeter body should be aligned with the screw holes of the pipeline flange to ensure the parallelism of the flange, avoid the flowmeter from other external forces, and prevent the table body from being deformed by force. Flow meter stuck. When the flowmeter is turned on, the front valve should be opened first, and then the rear valve should be opened slowly to allow the flowmeter to be started with pressure. This prevents the gas from impacting the rotor of the flowmeter due to the air hammer effect and causing the flowmeter to become stuck.
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Factors affecting the accuracy of gas flowmeters