How Natural Gas Flow Meters Improve Accuracy

Abstract: The information on how to improve the accuracy of natural gas flow meters is provided by excellent flow meter and flow meter manufacturers. Let's analyze how a natural gas flowmeter can improve measurement accuracy. 1. The influence of the too narrow straight pipe section at the inlet of the gas meter pipeline. In some transfer stations, it was found that the straight pipe section at the inlet of some gas meters was too thin, and the inner diameter of the straight pipe section was smaller than the inner diameter of the gas meter cavity. This installation method itself did not match. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on how to improve the accuracy of natural gas flowmeters. Let's analyze how a natural gas flowmeter can improve measurement accuracy. 1. The influence of the too narrow straight pipe section at the inlet of the gas meter pipeline. In some transfer stations, it was found that the straight pipe section at the inlet of some gas meters is too thin, and the inner diameter of the straight pipe section is smaller than the inner diameter of the gas meter cavity. This installation method itself does not meet the installation requirements of the gas meter. In addition, under this condition, when the transfer station produces too much gas, even if the gas valve is fully opened, the natural gas cannot be discharged from the thin pipe section in time, causing the pressure in the inlet pipeline of the gas meter to gradually increase, and when the pressure in the tank reaches a safe value , In order to avoid the pressure in the tank, the bypass pipeline has to be opened again. There is no metering device in the bypass, which causes the gas production measurement value of the transfer station to be lower than the actual value, and also makes the total measurement value of the external gas transmission of each transfer station and the total external transmission. The values ​​do not match. 2. Temperature effects and solutions. The working environment of the gas meter is limited by the temperature conditions. The temperature conditions are in the range of -20 to 55 °C. Only within this range can normal work be guaranteed. Once the ambient temperature is unsuitable, especially in winter, in the absence of thermal insulation measures, the gas meter will work under the condition that the ambient temperature is too low, which will affect the accuracy of measurement and cause damage to four pieces of the gas meter. Moreover, when the temperature of the natural gas in the gas pipeline is lower than -20°C, the lower temperature limit is exceeded, which affects the accurate measurement of the gas meter. Usually in winter, a winter heating pipeline is added next to the gas meter pipeline, and the pipeline is wrapped in the same insulation layer. The cost of this project is not high and the construction is convenient. 3. The flow meter returns the dry gas for self-consumption gas measurement. In terms of self-consumption of dry gas, the main station is equipped with an automatic control valve for return dry gas, and each transfer station is equipped with a pneumatic control valve. Through observation, it is found that the effect of the pneumatic control valve in each station after being put into operation is not ideal, which affects the normal return of dry gas. Gas metering. The main reason is that when the air pressure of the dry gas delivered to the main station fluctuates, the electric regulating valve of the station is also adjusted accordingly, so that the air pressure of each station interferes with each other, which affects the normal gas supply; sometimes the air pressure is too low, it is necessary to close the adjustment The valve takes the bypass pipeline so that the gas can be supplied normally, which makes the measurement of dry gas in some stations inaccurate. It is recommended to temporarily disable the regulating valve, so that the dry gas can go directly to the gas meter at each station. 4. The influence of oil and water vapor in the pipeline and the solution. In the field, a large amount of water and oil mixture can often be released from the vent valve, so it can be seen that natural gas contains a large amount of water and oil steam, and the pressure loss of wet gas during pipeline transportation is greater than that of dry gas. The flow rate is converted to the standard volume according to the gaseous equation between pressure, volume and temperature. When each team conducts sub-team metering, due to the large loss of steam during the transportation process, the steam pressure loss is too large, which leads to a large difference between the total export value of each transfer station and the total export value. In addition, the probe in the gas meter is surrounded by water, oil and vapor, which seriously affects the normal working environment of the gas meter, resulting in a decrease in the accuracy of the gas meter. This phenomenon is caused by some defects in the external environment and technological process. In view of these situations, the position of the gas meter in the process should be appropriately increased, so that the bypass line is below the gas meter and lower than the incoming gas line, so as to prevent the steam from directly flowing into the gas meter to affect the measurement when it forms a liquid; the bypass is regularly vented, Drain the remaining liquid in the pipe. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How Natural Gas Flow Meters Improve Accuracy'

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