In the verification and use of the flow meter coefficient, there are often some factors that cause errors, affecting the accuracy of gas metering. We have done a lot of work in this area to solve this problem. However, we still need some understanding in this regard. The following factors affect the accuracy of the accuracy of the steam flow meter . 1, the coefficient of the instrument itself. The accuracy of the meter is determined by its own coefficient. Once the meter coefficient has selected the best value for the production environment, the accuracy of the meter is determined. 2, the gas pressure range is the most suitable value. The gas pressure in the gas pipeline at the site is the fluctuating pressure. When the pulsating pressure is measured, the normal gas should be 1/3 to 1/2 of the gas meter range. Therefore, in the natural gas metering process, the degree of switching of the gas valve needs to be adjusted. To meet this condition. 3. The influence of the medium used in the gas meter verification process on the actual situation on the site. The medium used in the verification of the gas meter is air, which is provided by the pressure fan. Although the pressure fan can provide instantaneously changing airflow, firstly, due to the difference in density and expansion coefficient between the air and the natural gas, the vortex gas meter The pressure effect caused by the pressure probe is also different, so it will cause some errors; secondly, the variable pressure and variable flow gas provided by the medium-pressure fan will not be as strong as the random variation of the on-site air flow, and it will also make the gas meter after calibration. Reduced accuracy in field applications. Measures to Improve Accuracy of Steam Flow Meters At present, the vortex flowmeters mainly used in metering equipment in the oilfield gas supply industry can only exert their advantages under a suitable working environment, otherwise it will affect the measurement accuracy. The steam flow meter is different, the following analysis of the steam flow meter to improve the measurement accuracy. 1. The influence of the narrow straight pipe section at the inlet of the gas meter. In some transit stations, it was found that some gas meter inlets are too thin and the inner diameter of the straight pipe is smaller than the internal diameter of the gas meter cavity. This installation method does not meet the gas meter installation requirements. In addition, under this condition, when the transfer station produces too much gas, even if the gas valve is fully opened, natural gas cannot be discharged from the narrow pipe section in time, causing the pressure in the inlet line of the gas meter to gradually increase, and the pressure in the tank reaches a safe value. In order to avoid the pressure in the tank, the bypass line must be opened again, and no metering equipment is bypassed, resulting in a lower gas flow measurement value than the actual value at the transfer station, and the total gas metering value of the transfer station and the total external transmission. Inconsistent values. 2, temperature effects and solutions. The working environment of the gas meter is limited by temperature conditions. The temperature condition is in the range of -20 to 55°C. Only in this range can the normal operation be guaranteed. Once the ambient temperature is not suitable, especially in winter, without the insulation measures, the gas meter will work under the condition that the ambient temperature is too low, which will affect the measurement accuracy and cause damage to the interior of the gas meter. Moreover, when the natural gas temperature in the gas pipeline is lower than -20°C, the lower temperature limit is exceeded, which affects the accurate measurement of the gas meter. In winter, one winter heating pipeline is added next to the gas pipeline, and the pipeline is packaged in the same insulation layer. This project is not costly and easy to construct. 3, steam flow meter back to dry gas from the consumption of gas measurement. In the aspect of self-consumption of dry gas, the terminal station is equipped with an automatic return gas dry-regulating valve. Each transfer station is equipped with a pneumatic control valve. Through observation, it is found that the pneumatic control valve at each station after the production is put into use is not satisfactory, which affects the normal return gas flow. Gas metering. The main reason is that due to the fluctuation of dry gas pressure sent to the main station, the electric control valve of the station has also been adjusted accordingly, so that the pressure of each station interferes with each other, which affects the normal gas supply; sometimes the gas pressure is too low, it is necessary to turn off the regulation. The valve bypasses the bypass line so that the gas can be supplied normally. This makes some station dry gas measurement inaccurate. It is recommended that the regulating valve be temporarily deactivated to allow dry gas to go directly to the gas meter at each station. 4. The influence of oil vapor in the pipeline and its solution. In the field, a large number of water and oil mixtures can often be discharged from the vent valve. Therefore, it is known that natural gas contains a large amount of water and oil vapors, and the pressure loss of moisture in the pipeline transportation process is greater than that of dry gas. In the case of gas metering, the gas The flow rate is based on the pressure, volume, and temperature equations obtained through the conversion of the nominal volume. When each team conducts team measurement, due to the loss of steam in the transportation process, the steam pressure loss is too large, which leads to a large difference between the total value of the external transmission and the total value of the external transmission. In addition, the probe in the gas meter is surrounded by water and oil vapor, which seriously affects the normal working environment of the gas meter, leading to a decrease in the accuracy of the gas meter. The precision of the gas meter that can be verified by observation can reach 1.0, and the accuracy of one year can be reduced to 4.0. Level, this phenomenon is caused by some defects in the external environment and process flow. In view of these circumstances, the gas table position in the process should be appropriately increased so that the bypass line is below the gas meter and is lower than the incoming gas line to prevent direct flow of gas into the gas meter when the liquid is formed to affect the metering; the bypass is periodically vented. Drain the liquid in the pipeline. We have certain requirements for her accuracy when using steam meters . Therefore, the factors that influence this aspect are the hope that they will be solved as far as possible. It seems that the user's understanding of these conditions is very necessary.
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October 03, 2024